// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first)
+ for (; __first != __last; ++__first)
__f(*__first);
return __f;
}
typename iterator_traits<_RandomAccessIterator>::difference_type
__trip_count = (__last - __first) >> 2;
- for ( ; __trip_count > 0 ; --__trip_count)
+ for (; __trip_count > 0; --__trip_count)
{
if (*__first == __val)
return __first;
typename iterator_traits<_RandomAccessIterator>::difference_type
__trip_count = (__last - __first) >> 2;
- for ( ; __trip_count > 0 ; --__trip_count)
+ for (; __trip_count > 0; --__trip_count)
{
if (__pred(*__first))
return __first;
std::__iterator_category(__first));
}
+ /**
+ * @brief Find element from a set in a sequence.
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of match candidates.
+ * @param last2 End of match candidates.
+ * @return The first iterator @c i in the range
+ * @p [first1,last1) such that @c *i == @p *(i2) such that i2 is an
+ * interator in [first2,last2), or @p last1 if no such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for an element that is equal to
+ * some element in the range [first2,last2). If found, returns an iterator
+ * in the range [first1,last1), otherwise returns @p last1.
+ */
+ template<typename _InputIterator, typename _ForwardIterator>
+ _InputIterator
+ find_first_of(_InputIterator __first1, _InputIterator __last1,
+ _ForwardIterator __first2, _ForwardIterator __last2)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ for (; __first1 != __last1; ++__first1)
+ for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter)
+ if (*__first1 == *__iter)
+ return __first1;
+ return __last1;
+ }
+
+ /**
+ * @brief Find element from a set in a sequence using a predicate.
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of match candidates.
+ * @param last2 End of match candidates.
+ * @param comp Predicate to use.
+ * @return The first iterator @c i in the range
+ * @p [first1,last1) such that @c comp(*i, @p *(i2)) is true and i2 is an
+ * interator in [first2,last2), or @p last1 if no such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for an element that is equal to
+ * some element in the range [first2,last2). If found, returns an iterator in
+ * the range [first1,last1), otherwise returns @p last1.
+ */
+ template<typename _InputIterator, typename _ForwardIterator,
+ typename _BinaryPredicate>
+ _InputIterator
+ find_first_of(_InputIterator __first1, _InputIterator __last1,
+ _ForwardIterator __first2, _ForwardIterator __last2,
+ _BinaryPredicate __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_InputIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ for (; __first1 != __last1; ++__first1)
+ for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter)
+ if (__comp(*__first1, *__iter))
+ return __first1;
+ return __last1;
+ }
+
/**
* @brief Find two adjacent values in a sequence that are equal.
* @param first A forward iterator.
typename iterator_traits<_InputIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
typename iterator_traits<_InputIterator>::difference_type __n = 0;
- for ( ; __first != __last; ++__first)
+ for (; __first != __last; ++__first)
if (*__first == __value)
++__n;
return __n;
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
typename iterator_traits<_InputIterator>::difference_type __n = 0;
- for ( ; __first != __last; ++__first)
+ for (; __first != __last; ++__first)
if (__pred(*__first))
++__n;
return __n;
std::__iterator_category(__first));
}
- /**
- * @brief Perform an operation on a sequence.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param result An output iterator.
- * @param unary_op A unary operator.
- * @return An output iterator equal to @p result+(last-first).
- *
- * Applies the operator to each element in the input range and assigns
- * the results to successive elements of the output sequence.
- * Evaluates @p *(result+N)=unary_op(*(first+N)) for each @c N in the
- * range @p [0,last-first).
- *
- * @p unary_op must not alter its argument.
- */
- template<typename _InputIterator, typename _OutputIterator,
- typename _UnaryOperation>
- _OutputIterator
- transform(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result, _UnaryOperation __unary_op)
+ // find_end for forward iterators.
+ template<typename _ForwardIterator1, typename _ForwardIterator2>
+ _ForwardIterator1
+ __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ forward_iterator_tag, forward_iterator_tag)
{
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- // "the type returned by a _UnaryOperation"
- __typeof__(__unary_op(*__first))>)
- __glibcxx_requires_valid_range(__first, __last);
+ if (__first2 == __last2)
+ return __last1;
+ else
+ {
+ _ForwardIterator1 __result = __last1;
+ while (1)
+ {
+ _ForwardIterator1 __new_result
+ = std::search(__first1, __last1, __first2, __last2);
+ if (__new_result == __last1)
+ return __result;
+ else
+ {
+ __result = __new_result;
+ __first1 = __new_result;
+ ++__first1;
+ }
+ }
+ }
+ }
- for ( ; __first != __last; ++__first, ++__result)
- *__result = __unary_op(*__first);
- return __result;
+ template<typename _ForwardIterator1, typename _ForwardIterator2,
+ typename _BinaryPredicate>
+ _ForwardIterator1
+ __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ forward_iterator_tag, forward_iterator_tag,
+ _BinaryPredicate __comp)
+ {
+ if (__first2 == __last2)
+ return __last1;
+ else
+ {
+ _ForwardIterator1 __result = __last1;
+ while (1)
+ {
+ _ForwardIterator1 __new_result
+ = std::search(__first1, __last1, __first2, __last2, __comp);
+ if (__new_result == __last1)
+ return __result;
+ else
+ {
+ __result = __new_result;
+ __first1 = __new_result;
+ ++__first1;
+ }
+ }
+ }
}
- /**
- * @brief Perform an operation on corresponding elements of two sequences.
- * @param first1 An input iterator.
- * @param last1 An input iterator.
- * @param first2 An input iterator.
- * @param result An output iterator.
- * @param binary_op A binary operator.
- * @return An output iterator equal to @p result+(last-first).
- *
- * Applies the operator to the corresponding elements in the two
- * input ranges and assigns the results to successive elements of the
- * output sequence.
- * Evaluates @p *(result+N)=binary_op(*(first1+N),*(first2+N)) for each
- * @c N in the range @p [0,last1-first1).
- *
- * @p binary_op must not alter either of its arguments.
- */
- template<typename _InputIterator1, typename _InputIterator2,
- typename _OutputIterator, typename _BinaryOperation>
- _OutputIterator
- transform(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _OutputIterator __result,
- _BinaryOperation __binary_op)
+ // find_end for bidirectional iterators (much faster).
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2>
+ _BidirectionalIterator1
+ __find_end(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ bidirectional_iterator_tag, bidirectional_iterator_tag)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- // "the type returned by a _BinaryOperation"
- __typeof__(__binary_op(*__first1,*__first2))>)
- __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator1>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator2>)
- for ( ; __first1 != __last1; ++__first1, ++__first2, ++__result)
- *__result = __binary_op(*__first1, *__first2);
- return __result;
+ typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
+ typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
+
+ _RevIterator1 __rlast1(__first1);
+ _RevIterator2 __rlast2(__first2);
+ _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
+ _RevIterator2(__last2), __rlast2);
+
+ if (__rresult == __rlast1)
+ return __last1;
+ else
+ {
+ _BidirectionalIterator1 __result = __rresult.base();
+ std::advance(__result, -std::distance(__first2, __last2));
+ return __result;
+ }
}
- /**
- * @brief Replace each occurrence of one value in a sequence with another
- * value.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param old_value The value to be replaced.
- * @param new_value The replacement value.
- * @return replace() returns no value.
- *
- * For each iterator @c i in the range @p [first,last) if @c *i ==
- * @p old_value then the assignment @c *i = @p new_value is performed.
- */
- template<typename _ForwardIterator, typename _Tp>
- void
- replace(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __old_value, const _Tp& __new_value)
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _BinaryPredicate>
+ _BidirectionalIterator1
+ __find_end(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ bidirectional_iterator_tag, bidirectional_iterator_tag,
+ _BinaryPredicate __comp)
{
// concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
- _ForwardIterator>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
- __glibcxx_function_requires(_ConvertibleConcept<_Tp,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator1>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator2>)
- for ( ; __first != __last; ++__first)
- if (*__first == __old_value)
- *__first = __new_value;
- }
+ typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
+ typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
- /**
- * @brief Replace each value in a sequence for which a predicate returns
- * true with another value.
- * @param first A forward iterator.
- * @param last A forward iterator.
+ _RevIterator1 __rlast1(__first1);
+ _RevIterator2 __rlast2(__first2);
+ _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
+ _RevIterator2(__last2), __rlast2,
+ __comp);
+
+ if (__rresult == __rlast1)
+ return __last1;
+ else
+ {
+ _BidirectionalIterator1 __result = __rresult.base();
+ std::advance(__result, -std::distance(__first2, __last2));
+ return __result;
+ }
+ }
+
+ /**
+ * @brief Find last matching subsequence in a sequence.
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of sequence to match.
+ * @param last2 End of sequence to match.
+ * @return The last iterator @c i in the range
+ * @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N)
+ * for each @c N in the range @p [0,last2-first2), or @p last1 if no
+ * such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for a sub-sequence that compares
+ * equal value-by-value with the sequence given by @p [first2,last2) and
+ * returns an iterator to the first element of the sub-sequence, or
+ * @p last1 if the sub-sequence is not found. The sub-sequence will be the
+ * last such subsequence contained in [first,last1).
+ *
+ * Because the sub-sequence must lie completely within the range
+ * @p [first1,last1) it must start at a position less than
+ * @p last1-(last2-first2) where @p last2-first2 is the length of the
+ * sub-sequence.
+ * This means that the returned iterator @c i will be in the range
+ * @p [first1,last1-(last2-first2))
+ */
+ template<typename _ForwardIterator1, typename _ForwardIterator2>
+ inline _ForwardIterator1
+ find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator1>::value_type,
+ typename iterator_traits<_ForwardIterator2>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ return std::__find_end(__first1, __last1, __first2, __last2,
+ std::__iterator_category(__first1),
+ std::__iterator_category(__first2));
+ }
+
+ /**
+ * @brief Find last matching subsequence in a sequence using a predicate.
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of sequence to match.
+ * @param last2 End of sequence to match.
+ * @param comp The predicate to use.
+ * @return The last iterator @c i in the range
+ * @p [first1,last1-(last2-first2)) such that @c predicate(*(i+N), @p
+ * (first2+N)) is true for each @c N in the range @p [0,last2-first2), or
+ * @p last1 if no such iterator exists.
+ *
+ * Searches the range @p [first1,last1) for a sub-sequence that compares
+ * equal value-by-value with the sequence given by @p [first2,last2) using
+ * comp as a predicate and returns an iterator to the first element of the
+ * sub-sequence, or @p last1 if the sub-sequence is not found. The
+ * sub-sequence will be the last such subsequence contained in
+ * [first,last1).
+ *
+ * Because the sub-sequence must lie completely within the range
+ * @p [first1,last1) it must start at a position less than
+ * @p last1-(last2-first2) where @p last2-first2 is the length of the
+ * sub-sequence.
+ * This means that the returned iterator @c i will be in the range
+ * @p [first1,last1-(last2-first2))
+ */
+ template<typename _ForwardIterator1, typename _ForwardIterator2,
+ typename _BinaryPredicate>
+ inline _ForwardIterator1
+ find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ _BinaryPredicate __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator1>::value_type,
+ typename iterator_traits<_ForwardIterator2>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_requires_valid_range(__first2, __last2);
+
+ return std::__find_end(__first1, __last1, __first2, __last2,
+ std::__iterator_category(__first1),
+ std::__iterator_category(__first2),
+ __comp);
+ }
+
+ /**
+ * @brief Perform an operation on a sequence.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param unary_op A unary operator.
+ * @return An output iterator equal to @p result+(last-first).
+ *
+ * Applies the operator to each element in the input range and assigns
+ * the results to successive elements of the output sequence.
+ * Evaluates @p *(result+N)=unary_op(*(first+N)) for each @c N in the
+ * range @p [0,last-first).
+ *
+ * @p unary_op must not alter its argument.
+ */
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _UnaryOperation>
+ _OutputIterator
+ transform(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _UnaryOperation __unary_op)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ // "the type returned by a _UnaryOperation"
+ __typeof__(__unary_op(*__first))>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for (; __first != __last; ++__first, ++__result)
+ *__result = __unary_op(*__first);
+ return __result;
+ }
+
+ /**
+ * @brief Perform an operation on corresponding elements of two sequences.
+ * @param first1 An input iterator.
+ * @param last1 An input iterator.
+ * @param first2 An input iterator.
+ * @param result An output iterator.
+ * @param binary_op A binary operator.
+ * @return An output iterator equal to @p result+(last-first).
+ *
+ * Applies the operator to the corresponding elements in the two
+ * input ranges and assigns the results to successive elements of the
+ * output sequence.
+ * Evaluates @p *(result+N)=binary_op(*(first1+N),*(first2+N)) for each
+ * @c N in the range @p [0,last1-first1).
+ *
+ * @p binary_op must not alter either of its arguments.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _BinaryOperation>
+ _OutputIterator
+ transform(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _OutputIterator __result,
+ _BinaryOperation __binary_op)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ // "the type returned by a _BinaryOperation"
+ __typeof__(__binary_op(*__first1,*__first2))>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+
+ for (; __first1 != __last1; ++__first1, ++__first2, ++__result)
+ *__result = __binary_op(*__first1, *__first2);
+ return __result;
+ }
+
+ /**
+ * @brief Replace each occurrence of one value in a sequence with another
+ * value.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param old_value The value to be replaced.
+ * @param new_value The replacement value.
+ * @return replace() returns no value.
+ *
+ * For each iterator @c i in the range @p [first,last) if @c *i ==
+ * @p old_value then the assignment @c *i = @p new_value is performed.
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ void
+ replace(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __old_value, const _Tp& __new_value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_function_requires(_ConvertibleConcept<_Tp,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for (; __first != __last; ++__first)
+ if (*__first == __old_value)
+ *__first = __new_value;
+ }
+
+ /**
+ * @brief Replace each value in a sequence for which a predicate returns
+ * true with another value.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
* @param pred A predicate.
* @param new_value The replacement value.
* @return replace_if() returns no value.
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first)
+ for (; __first != __last; ++__first)
if (__pred(*__first))
*__first = __new_value;
}
typename iterator_traits<_InputIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first, ++__result)
+ for (; __first != __last; ++__first, ++__result)
if (*__first == __old_value)
*__result = __new_value;
else
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first, ++__result)
+ for (; __first != __last; ++__first, ++__result)
if (__pred(*__first))
*__result = __new_value;
else
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first)
+ for (; __first != __last; ++__first)
*__first = __gen();
}
// "the type returned by a _Generator"
__typeof__(__gen())>)
- for ( ; __n > 0; --__n, ++__first)
+ for (; __n > 0; --__n, ++__first)
*__first = __gen();
return __first;
}
typename iterator_traits<_InputIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first)
+ for (; __first != __last; ++__first)
if (!(*__first == __value))
{
*__result = *__first;
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first)
+ for (; __first != __last; ++__first)
if (!bool(__pred(*__first)))
{
*__result = *__first;
}
/**
- * @if maint
- * This is an uglified unique_copy(_InputIterator, _InputIterator,
- * _OutputIterator)
- * overloaded for forward iterators and output iterator as result.
- * @endif
+ * @brief Remove consecutive duplicate values from a sequence.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Removes all but the first element from each group of consecutive
+ * values that compare equal.
+ * unique() is stable, so the relative order of elements that are
+ * not removed is unchanged.
+ * Elements between the end of the resulting sequence and @p last
+ * are still present, but their value is unspecified.
*/
- template<typename _ForwardIterator, typename _OutputIterator>
- _OutputIterator
- __unique_copy(_ForwardIterator __first, _ForwardIterator __last,
- _OutputIterator __result,
- forward_iterator_tag, output_iterator_tag)
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ unique(_ForwardIterator __first, _ForwardIterator __last)
{
- // concept requirements -- taken care of in dispatching function
- _ForwardIterator __next = __first;
- *__result = *__first;
- while (++__next != __last)
- if (!(*__first == *__next))
- {
- __first = __next;
- *++__result = *__first;
- }
- return ++__result;
- }
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_EqualityComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- /**
- * @if maint
- * This is an uglified unique_copy(_InputIterator, _InputIterator,
- * _OutputIterator)
- * overloaded for input iterators and output iterator as result.
+ // Skip the beginning, if already unique.
+ __first = std::adjacent_find(__first, __last);
+ if (__first == __last)
+ return __last;
+
+ // Do the real copy work.
+ _ForwardIterator __dest = __first;
+ ++__first;
+ while (++__first != __last)
+ if (!(*__dest == *__first))
+ *++__dest = *__first;
+ return ++__dest;
+ }
+
+ /**
+ * @brief Remove consecutive values from a sequence using a predicate.
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param binary_pred A binary predicate.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Removes all but the first element from each group of consecutive
+ * values for which @p binary_pred returns true.
+ * unique() is stable, so the relative order of elements that are
+ * not removed is unchanged.
+ * Elements between the end of the resulting sequence and @p last
+ * are still present, but their value is unspecified.
+ */
+ template<typename _ForwardIterator, typename _BinaryPredicate>
+ _ForwardIterator
+ unique(_ForwardIterator __first, _ForwardIterator __last,
+ _BinaryPredicate __binary_pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ // Skip the beginning, if already unique.
+ __first = std::adjacent_find(__first, __last, __binary_pred);
+ if (__first == __last)
+ return __last;
+
+ // Do the real copy work.
+ _ForwardIterator __dest = __first;
+ ++__first;
+ while (++__first != __last)
+ if (!bool(__binary_pred(*__dest, *__first)))
+ *++__dest = *__first;
+ return ++__dest;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified unique_copy(_InputIterator, _InputIterator,
+ * _OutputIterator)
+ * overloaded for forward iterators and output iterator as result.
+ * @endif
+ */
+ template<typename _ForwardIterator, typename _OutputIterator>
+ _OutputIterator
+ __unique_copy(_ForwardIterator __first, _ForwardIterator __last,
+ _OutputIterator __result,
+ forward_iterator_tag, output_iterator_tag)
+ {
+ // concept requirements -- taken care of in dispatching function
+ _ForwardIterator __next = __first;
+ *__result = *__first;
+ while (++__next != __last)
+ if (!(*__first == *__next))
+ {
+ __first = __next;
+ *++__result = *__first;
+ }
+ return ++__result;
+ }
+
+ /**
+ * @if maint
+ * This is an uglified unique_copy(_InputIterator, _InputIterator,
+ * _OutputIterator)
+ * overloaded for input iterators and output iterator as result.
* @endif
*/
template<typename _InputIterator, typename _OutputIterator>
std::__iterator_category(__result));
}
- /**
- * @brief Remove consecutive duplicate values from a sequence.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @return An iterator designating the end of the resulting sequence.
- *
- * Removes all but the first element from each group of consecutive
- * values that compare equal.
- * unique() is stable, so the relative order of elements that are
- * not removed is unchanged.
- * Elements between the end of the resulting sequence and @p last
- * are still present, but their value is unspecified.
- */
- template<typename _ForwardIterator>
- _ForwardIterator
- unique(_ForwardIterator __first, _ForwardIterator __last)
- {
- // concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
- _ForwardIterator>)
- __glibcxx_function_requires(_EqualityComparableConcept<
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- // Skip the beginning, if already unique.
- __first = std::adjacent_find(__first, __last);
- if (__first == __last)
- return __last;
-
- // Do the real copy work.
- _ForwardIterator __dest = __first;
- ++__first;
- while (++__first != __last)
- if (!(*__dest == *__first))
- *++__dest = *__first;
- return ++__dest;
- }
-
- /**
- * @brief Remove consecutive values from a sequence using a predicate.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param binary_pred A binary predicate.
- * @return An iterator designating the end of the resulting sequence.
- *
- * Removes all but the first element from each group of consecutive
- * values for which @p binary_pred returns true.
- * unique() is stable, so the relative order of elements that are
- * not removed is unchanged.
- * Elements between the end of the resulting sequence and @p last
- * are still present, but their value is unspecified.
- */
- template<typename _ForwardIterator, typename _BinaryPredicate>
- _ForwardIterator
- unique(_ForwardIterator __first, _ForwardIterator __last,
- _BinaryPredicate __binary_pred)
- {
- // concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
- _ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
- typename iterator_traits<_ForwardIterator>::value_type,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- // Skip the beginning, if already unique.
- __first = std::adjacent_find(__first, __last, __binary_pred);
- if (__first == __last)
- return __last;
-
- // Do the real copy work.
- _ForwardIterator __dest = __first;
- ++__first;
- while (++__first != __last)
- if (!bool(__binary_pred(*__dest, *__first)))
- *++__dest = *__first;
- return ++__dest;
- }
-
/**
* @if maint
* This is an uglified reverse(_BidirectionalIterator,
return __result;
}
-
/**
* @if maint
* This is a helper function for the rotate algorithm specialized on RAIs.
return;
}
- const _Distance __d = __gcd(__n, __k);
+ const _Distance __d = std::__gcd(__n, __k);
for (_Distance __i = 0; __i < __d; __i++)
{
{
_ForwardIterator __result1 = __first;
_Pointer __result2 = __buffer;
- for ( ; __first != __last ; ++__first)
+ for (; __first != __last; ++__first)
if (__pred(*__first))
{
*__result1 = *__first;
/**
* @if maint
- * This is a helper function...
+ * This is a helper function for the sort routines.
* @endif
*/
- template<typename _RandomAccessIterator, typename _Tp>
- _RandomAccessIterator
- __unguarded_partition(_RandomAccessIterator __first,
- _RandomAccessIterator __last, _Tp __pivot)
+ template<typename _RandomAccessIterator>
+ void
+ __heap_select(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last)
{
- while (true)
- {
- while (*__first < __pivot)
- ++__first;
- --__last;
- while (__pivot < *__last)
- --__last;
- if (!(__first < __last))
- return __first;
- std::iter_swap(__first, __last);
- ++__first;
- }
- }
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
- /**
- * @if maint
- * This is a helper function...
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
- _RandomAccessIterator
- __unguarded_partition(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Tp __pivot, _Compare __comp)
- {
- while (true)
- {
- while (__comp(*__first, __pivot))
- ++__first;
- --__last;
- while (__comp(__pivot, *__last))
- --__last;
- if (!(__first < __last))
- return __first;
- std::iter_swap(__first, __last);
- ++__first;
- }
+ std::make_heap(__first, __middle);
+ for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
+ if (*__i < *__first)
+ std::__pop_heap(__first, __middle, __i, _ValueType(*__i));
}
/**
* @if maint
- * @doctodo
- * This controls some aspect of the sort routines.
- * @endif
- */
- enum { _S_threshold = 16 };
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
+ * This is a helper function for the sort routines.
* @endif
*/
- template<typename _RandomAccessIterator, typename _Tp>
+ template<typename _RandomAccessIterator, typename _Compare>
void
- __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val)
+ __heap_select(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last, _Compare __comp)
{
- _RandomAccessIterator __next = __last;
- --__next;
- while (__val < *__next)
- {
- *__last = *__next;
- __last = __next;
- --__next;
- }
- *__last = __val;
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
- void
- __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val,
- _Compare __comp)
- {
- _RandomAccessIterator __next = __last;
- --__next;
- while (__comp(__val, *__next))
- {
- *__last = *__next;
- __last = __next;
- --__next;
- }
- *__last = __val;
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator>
- void
- __insertion_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last)
- {
- if (__first == __last)
- return;
-
- for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
- {
- typename iterator_traits<_RandomAccessIterator>::value_type
- __val = *__i;
- if (__val < *__first)
- {
- std::copy_backward(__first, __i, __i + 1);
- *__first = __val;
- }
- else
- std::__unguarded_linear_insert(__i, __val);
- }
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Compare>
- void
- __insertion_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last, _Compare __comp)
- {
- if (__first == __last) return;
-
- for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
- {
- typename iterator_traits<_RandomAccessIterator>::value_type
- __val = *__i;
- if (__comp(__val, *__first))
- {
- std::copy_backward(__first, __i, __i + 1);
- *__first = __val;
- }
- else
- std::__unguarded_linear_insert(__i, __val, __comp);
- }
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator>
- inline void
- __unguarded_insertion_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
- std::__unguarded_linear_insert(__i, _ValueType(*__i));
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Compare>
- inline void
- __unguarded_insertion_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last, _Compare __comp)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
- std::__unguarded_linear_insert(__i, _ValueType(*__i), __comp);
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator>
- void
- __final_insertion_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last)
- {
- if (__last - __first > int(_S_threshold))
- {
- std::__insertion_sort(__first, __first + int(_S_threshold));
- std::__unguarded_insertion_sort(__first + int(_S_threshold), __last);
- }
- else
- std::__insertion_sort(__first, __last);
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Compare>
- void
- __final_insertion_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last, _Compare __comp)
- {
- if (__last - __first > int(_S_threshold))
- {
- std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
- std::__unguarded_insertion_sort(__first + int(_S_threshold), __last,
- __comp);
- }
- else
- std::__insertion_sort(__first, __last, __comp);
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routines.
- * @endif
- */
- template<typename _RandomAccessIterator>
- void
- __heap_select(_RandomAccessIterator __first,
- _RandomAccessIterator __middle,
- _RandomAccessIterator __last)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- std::make_heap(__first, __middle);
- for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
- if (*__i < *__first)
- std::__pop_heap(__first, __middle, __i, _ValueType(*__i));
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routines.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Compare>
- void
- __heap_select(_RandomAccessIterator __first,
- _RandomAccessIterator __middle,
- _RandomAccessIterator __last, _Compare __comp)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- std::make_heap(__first, __middle, __comp);
- for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
- if (__comp(*__i, *__first))
- std::__pop_heap(__first, __middle, __i, _ValueType(*__i), __comp);
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routines.
- * @endif
- */
- template<typename _Size>
- inline _Size
- __lg(_Size __n)
- {
- _Size __k;
- for (__k = 0; __n != 1; __n >>= 1)
- ++__k;
- return __k;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ std::make_heap(__first, __middle, __comp);
+ for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
+ if (__comp(*__i, *__first))
+ std::__pop_heap(__first, __middle, __i, _ValueType(*__i), __comp);
}
/**
* This is a helper function for the sort routine.
* @endif
*/
- template<typename _RandomAccessIterator, typename _Size>
+ template<typename _RandomAccessIterator, typename _Tp>
void
- __introsort_loop(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Size __depth_limit)
+ __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- while (__last - __first > int(_S_threshold))
+ _RandomAccessIterator __next = __last;
+ --__next;
+ while (__val < *__next)
{
- if (__depth_limit == 0)
- {
- std::partial_sort(__first, __last, __last);
- return;
- }
- --__depth_limit;
- _RandomAccessIterator __cut =
- std::__unguarded_partition(__first, __last,
- _ValueType(std::__median(*__first,
- *(__first
- + (__last
- - __first)
- / 2),
- *(__last
- - 1))));
- std::__introsort_loop(__cut, __last, __depth_limit);
- __last = __cut;
+ *__last = *__next;
+ __last = __next;
+ --__next;
}
+ *__last = __val;
}
/**
* This is a helper function for the sort routine.
* @endif
*/
- template<typename _RandomAccessIterator, typename _Size, typename _Compare>
+ template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
void
- __introsort_loop(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Size __depth_limit, _Compare __comp)
+ __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val,
+ _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- while (__last - __first > int(_S_threshold))
+ _RandomAccessIterator __next = __last;
+ --__next;
+ while (__comp(__val, *__next))
{
- if (__depth_limit == 0)
- {
- std::partial_sort(__first, __last, __last, __comp);
- return;
- }
- --__depth_limit;
- _RandomAccessIterator __cut =
- std::__unguarded_partition(__first, __last,
- _ValueType(std::__median(*__first,
- *(__first
- + (__last
- - __first)
- / 2),
- *(__last - 1),
- __comp)),
- __comp);
- std::__introsort_loop(__cut, __last, __depth_limit, __comp);
- __last = __cut;
+ *__last = *__next;
+ __last = __next;
+ --__next;
}
+ *__last = __val;
}
/**
- * @brief Sort the elements of a sequence.
- * @param first An iterator.
- * @param last Another iterator.
- * @return Nothing.
- *
- * Sorts the elements in the range @p [first,last) in ascending order,
- * such that @p *(i+1)<*i is false for each iterator @p i in the range
- * @p [first,last-1).
- *
- * The relative ordering of equivalent elements is not preserved, use
- * @p stable_sort() if this is needed.
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
*/
template<typename _RandomAccessIterator>
- inline void
- sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ void
+ __insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
- __glibcxx_requires_valid_range(__first, __last);
+ if (__first == __last)
+ return;
- if (__first != __last)
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
{
- std::__introsort_loop(__first, __last,
- std::__lg(__last - __first) * 2);
- std::__final_insertion_sort(__first, __last);
+ typename iterator_traits<_RandomAccessIterator>::value_type
+ __val = *__i;
+ if (__val < *__first)
+ {
+ std::copy_backward(__first, __i, __i + 1);
+ *__first = __val;
+ }
+ else
+ std::__unguarded_linear_insert(__i, __val);
}
}
/**
- * @brief Sort the elements of a sequence using a predicate for comparison.
- * @param first An iterator.
- * @param last Another iterator.
- * @param comp A comparison functor.
- * @return Nothing.
- *
- * Sorts the elements in the range @p [first,last) in ascending order,
- * such that @p comp(*(i+1),*i) is false for every iterator @p i in the
- * range @p [first,last-1).
- *
- * The relative ordering of equivalent elements is not preserved, use
- * @p stable_sort() if this is needed.
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
*/
template<typename _RandomAccessIterator, typename _Compare>
- inline void
- sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Compare __comp)
+ void
+ __insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType,
- _ValueType>)
- __glibcxx_requires_valid_range(__first, __last);
+ if (__first == __last) return;
- if (__first != __last)
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
{
- std::__introsort_loop(__first, __last,
- std::__lg(__last - __first) * 2, __comp);
- std::__final_insertion_sort(__first, __last, __comp);
+ typename iterator_traits<_RandomAccessIterator>::value_type
+ __val = *__i;
+ if (__comp(__val, *__first))
+ {
+ std::copy_backward(__first, __i, __i + 1);
+ *__first = __val;
+ }
+ else
+ std::__unguarded_linear_insert(__i, __val, __comp);
}
}
/**
- * @brief Finds the first position in which @a val could be inserted
- * without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @return An iterator pointing to the first element "not less than" @a val,
- * or end() if every element is less than @a val.
- * @ingroup binarysearch
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
*/
- template<typename _ForwardIterator, typename _Tp>
- _ForwardIterator
- lower_bound(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val)
+ template<typename _RandomAccessIterator>
+ inline void
+ __unguarded_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type
- _DistanceType;
-
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>)
- __glibcxx_requires_partitioned(__first, __last, __val);
-
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle;
- while (__len > 0)
- {
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (*__middle < __val)
- {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
- }
- else
- __len = __half;
- }
- return __first;
+ for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
+ std::__unguarded_linear_insert(__i, _ValueType(*__i));
}
/**
- * @brief Finds the first position in which @a val could be inserted
- * without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @param comp A functor to use for comparisons.
- * @return An iterator pointing to the first element "not less than" @a val,
- * or end() if every element is less than @a val.
- * @ingroup binarysearch
- *
- * The comparison function should have the same effects on ordering as
- * the function used for the initial sort.
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
*/
- template<typename _ForwardIterator, typename _Tp, typename _Compare>
- _ForwardIterator
- lower_bound(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val, _Compare __comp)
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ __unguarded_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type
- _DistanceType;
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType, _Tp>)
- __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+ for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
+ std::__unguarded_linear_insert(__i, _ValueType(*__i), __comp);
+ }
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle;
+ /**
+ * @if maint
+ * @doctodo
+ * This controls some aspect of the sort routines.
+ * @endif
+ */
+ enum { _S_threshold = 16 };
- while (__len > 0)
+ /**
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ void
+ __final_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
+ {
+ if (__last - __first > int(_S_threshold))
{
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (__comp(*__middle, __val))
- {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
- }
- else
- __len = __half;
+ std::__insertion_sort(__first, __first + int(_S_threshold));
+ std::__unguarded_insertion_sort(__first + int(_S_threshold), __last);
}
- return __first;
+ else
+ std::__insertion_sort(__first, __last);
}
/**
- * @brief Finds the last position in which @a val could be inserted
- * without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @return An iterator pointing to the first element greater than @a val,
- * or end() if no elements are greater than @a val.
- * @ingroup binarysearch
+ * @if maint
+ * This is a helper function for the sort routine.
+ * @endif
*/
- template<typename _ForwardIterator, typename _Tp>
- _ForwardIterator
- upper_bound(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val)
+ template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __final_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type
- _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type
- _DistanceType;
-
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
- __glibcxx_requires_partitioned(__first, __last, __val);
-
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle;
-
- while (__len > 0)
+ if (__last - __first > int(_S_threshold))
{
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (__val < *__middle)
- __len = __half;
- else
- {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
- }
+ std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
+ std::__unguarded_insertion_sort(__first + int(_S_threshold), __last,
+ __comp);
}
- return __first;
+ else
+ std::__insertion_sort(__first, __last, __comp);
}
/**
- * @brief Finds the last position in which @a val could be inserted
- * without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @param comp A functor to use for comparisons.
- * @return An iterator pointing to the first element greater than @a val,
- * or end() if no elements are greater than @a val.
- * @ingroup binarysearch
- *
- * The comparison function should have the same effects on ordering as
- * the function used for the initial sort.
+ * @if maint
+ * This is a helper function...
+ * @endif
*/
- template<typename _ForwardIterator, typename _Tp, typename _Compare>
- _ForwardIterator
- upper_bound(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val, _Compare __comp)
+ template<typename _RandomAccessIterator, typename _Tp>
+ _RandomAccessIterator
+ __unguarded_partition(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Tp __pivot)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type
- _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type
- _DistanceType;
-
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _Tp, _ValueType>)
- __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
-
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle;
-
- while (__len > 0)
+ while (true)
{
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (__comp(__val, *__middle))
- __len = __half;
- else
- {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
- }
+ while (*__first < __pivot)
+ ++__first;
+ --__last;
+ while (__pivot < *__last)
+ --__last;
+ if (!(__first < __last))
+ return __first;
+ std::iter_swap(__first, __last);
+ ++__first;
}
- return __first;
}
/**
* @if maint
- * This is a helper function for the merge routines.
+ * This is a helper function...
* @endif
*/
- template<typename _BidirectionalIterator, typename _Distance>
- void
- __merge_without_buffer(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last,
- _Distance __len1, _Distance __len2)
+ template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
+ _RandomAccessIterator
+ __unguarded_partition(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Tp __pivot, _Compare __comp)
{
- if (__len1 == 0 || __len2 == 0)
- return;
- if (__len1 + __len2 == 2)
- {
- if (*__middle < *__first)
- std::iter_swap(__first, __middle);
- return;
- }
- _BidirectionalIterator __first_cut = __first;
- _BidirectionalIterator __second_cut = __middle;
- _Distance __len11 = 0;
- _Distance __len22 = 0;
- if (__len1 > __len2)
- {
- __len11 = __len1 / 2;
- std::advance(__first_cut, __len11);
- __second_cut = std::lower_bound(__middle, __last, *__first_cut);
- __len22 = std::distance(__middle, __second_cut);
- }
- else
+ while (true)
{
- __len22 = __len2 / 2;
- std::advance(__second_cut, __len22);
- __first_cut = std::upper_bound(__first, __middle, *__second_cut);
- __len11 = std::distance(__first, __first_cut);
+ while (__comp(*__first, __pivot))
+ ++__first;
+ --__last;
+ while (__comp(__pivot, *__last))
+ --__last;
+ if (!(__first < __last))
+ return __first;
+ std::iter_swap(__first, __last);
+ ++__first;
}
- std::rotate(__first_cut, __middle, __second_cut);
- _BidirectionalIterator __new_middle = __first_cut;
- std::advance(__new_middle, std::distance(__middle, __second_cut));
- std::__merge_without_buffer(__first, __first_cut, __new_middle,
- __len11, __len22);
- std::__merge_without_buffer(__new_middle, __second_cut, __last,
- __len1 - __len11, __len2 - __len22);
}
/**
* @if maint
- * This is a helper function for the merge routines.
+ * This is a helper function for the sort routine.
* @endif
*/
- template<typename _BidirectionalIterator, typename _Distance,
- typename _Compare>
+ template<typename _RandomAccessIterator, typename _Size>
void
- __merge_without_buffer(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last,
- _Distance __len1, _Distance __len2,
- _Compare __comp)
+ __introsort_loop(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Size __depth_limit)
{
- if (__len1 == 0 || __len2 == 0)
- return;
- if (__len1 + __len2 == 2)
- {
- if (__comp(*__middle, *__first))
- std::iter_swap(__first, __middle);
- return;
- }
- _BidirectionalIterator __first_cut = __first;
- _BidirectionalIterator __second_cut = __middle;
- _Distance __len11 = 0;
- _Distance __len22 = 0;
- if (__len1 > __len2)
- {
- __len11 = __len1 / 2;
- std::advance(__first_cut, __len11);
- __second_cut = std::lower_bound(__middle, __last, *__first_cut,
- __comp);
- __len22 = std::distance(__middle, __second_cut);
- }
- else
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ while (__last - __first > int(_S_threshold))
{
- __len22 = __len2 / 2;
- std::advance(__second_cut, __len22);
- __first_cut = std::upper_bound(__first, __middle, *__second_cut,
- __comp);
- __len11 = std::distance(__first, __first_cut);
+ if (__depth_limit == 0)
+ {
+ std::partial_sort(__first, __last, __last);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition(__first, __last,
+ _ValueType(std::__median(*__first,
+ *(__first
+ + (__last
+ - __first)
+ / 2),
+ *(__last
+ - 1))));
+ std::__introsort_loop(__cut, __last, __depth_limit);
+ __last = __cut;
}
- std::rotate(__first_cut, __middle, __second_cut);
- _BidirectionalIterator __new_middle = __first_cut;
- std::advance(__new_middle, std::distance(__middle, __second_cut));
- std::__merge_without_buffer(__first, __first_cut, __new_middle,
- __len11, __len22, __comp);
- std::__merge_without_buffer(__new_middle, __second_cut, __last,
- __len1 - __len11, __len2 - __len22, __comp);
}
/**
* @if maint
- * This is a helper function for the stable sorting routines.
+ * This is a helper function for the sort routine.
* @endif
*/
- template<typename _RandomAccessIterator>
+ template<typename _RandomAccessIterator, typename _Size, typename _Compare>
void
- __inplace_stable_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last)
+ __introsort_loop(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Size __depth_limit, _Compare __comp)
{
- if (__last - __first < 15)
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ while (__last - __first > int(_S_threshold))
{
- std::__insertion_sort(__first, __last);
- return;
+ if (__depth_limit == 0)
+ {
+ std::partial_sort(__first, __last, __last, __comp);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition(__first, __last,
+ _ValueType(std::__median(*__first,
+ *(__first
+ + (__last
+ - __first)
+ / 2),
+ *(__last - 1),
+ __comp)),
+ __comp);
+ std::__introsort_loop(__cut, __last, __depth_limit, __comp);
+ __last = __cut;
}
- _RandomAccessIterator __middle = __first + (__last - __first) / 2;
- std::__inplace_stable_sort(__first, __middle);
- std::__inplace_stable_sort(__middle, __last);
- std::__merge_without_buffer(__first, __middle, __last,
- __middle - __first,
- __last - __middle);
}
/**
* @if maint
- * This is a helper function for the stable sorting routines.
+ * This is a helper function for the sort routines.
* @endif
*/
- template<typename _RandomAccessIterator, typename _Compare>
- void
- __inplace_stable_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last, _Compare __comp)
+ template<typename _Size>
+ inline _Size
+ __lg(_Size __n)
{
- if (__last - __first < 15)
- {
- std::__insertion_sort(__first, __last, __comp);
- return;
- }
- _RandomAccessIterator __middle = __first + (__last - __first) / 2;
- std::__inplace_stable_sort(__first, __middle, __comp);
- std::__inplace_stable_sort(__middle, __last, __comp);
- std::__merge_without_buffer(__first, __middle, __last,
- __middle - __first,
- __last - __middle,
- __comp);
+ _Size __k;
+ for (__k = 0; __n != 1; __n >>= 1)
+ ++__k;
+ return __k;
}
/**
- * @brief Merges two sorted ranges.
- * @param first1 An iterator.
- * @param first2 Another iterator.
- * @param last1 Another iterator.
- * @param last2 Another iterator.
- * @param result An iterator pointing to the end of the merged range.
- * @return An iterator pointing to the first element "not less than" @a val.
+ * @brief Sort the elements of a sequence.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @return Nothing.
*
- * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
- * [result, result + (last1-first1) + (last2-first2)). Both input ranges
- * must be sorted, and the output range must not overlap with either of
- * the input ranges. The sort is @e stable, that is, for equivalent
- * elements in the two ranges, elements from the first range will always
- * come before elements from the second.
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p *(i+1)<*i is false for each iterator @p i in the range
+ * @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is not preserved, use
+ * @p stable_sort() if this is needed.
*/
- template<typename _InputIterator1, typename _InputIterator2,
- typename _OutputIterator>
- _OutputIterator
- merge(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result)
+ template<typename _RandomAccessIterator>
+ inline void
+ sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_InputIterator1>::value_type
- _ValueType1;
- typedef typename iterator_traits<_InputIterator2>::value_type
- _ValueType2;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- _ValueType1>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- _ValueType2>)
- __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
- __glibcxx_requires_sorted(__first1, __last1);
- __glibcxx_requires_sorted(__first2, __last2);
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
- while (__first1 != __last1 && __first2 != __last2)
+ if (__first != __last)
{
- if (*__first2 < *__first1)
- {
- *__result = *__first2;
- ++__first2;
- }
- else
- {
- *__result = *__first1;
- ++__first1;
- }
- ++__result;
+ std::__introsort_loop(__first, __last,
+ std::__lg(__last - __first) * 2);
+ std::__final_insertion_sort(__first, __last);
}
- return std::copy(__first2, __last2, std::copy(__first1, __last1,
- __result));
}
/**
- * @brief Merges two sorted ranges.
- * @param first1 An iterator.
- * @param first2 Another iterator.
- * @param last1 Another iterator.
- * @param last2 Another iterator.
- * @param result An iterator pointing to the end of the merged range.
- * @param comp A functor to use for comparisons.
- * @return An iterator pointing to the first element "not less than" @a val.
+ * @brief Sort the elements of a sequence using a predicate for comparison.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
*
- * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
- * [result, result + (last1-first1) + (last2-first2)). Both input ranges
- * must be sorted, and the output range must not overlap with either of
- * the input ranges. The sort is @e stable, that is, for equivalent
- * elements in the two ranges, elements from the first range will always
- * come before elements from the second.
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p comp(*(i+1),*i) is false for every iterator @p i in the
+ * range @p [first,last-1).
*
- * The comparison function should have the same effects on ordering as
- * the function used for the initial sort.
+ * The relative ordering of equivalent elements is not preserved, use
+ * @p stable_sort() if this is needed.
*/
- template<typename _InputIterator1, typename _InputIterator2,
- typename _OutputIterator, typename _Compare>
- _OutputIterator
- merge(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result, _Compare __comp)
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Compare __comp)
{
- typedef typename iterator_traits<_InputIterator1>::value_type
- _ValueType1;
- typedef typename iterator_traits<_InputIterator2>::value_type
- _ValueType2;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- _ValueType1>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- _ValueType2>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType2, _ValueType1>)
- __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
- __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType,
+ _ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
- while (__first1 != __last1 && __first2 != __last2)
+ if (__first != __last)
{
- if (__comp(*__first2, *__first1))
- {
- *__result = *__first2;
- ++__first2;
- }
- else
- {
- *__result = *__first1;
- ++__first1;
- }
- ++__result;
+ std::__introsort_loop(__first, __last,
+ std::__lg(__last - __first) * 2, __comp);
+ std::__final_insertion_sort(__first, __last, __comp);
}
- return std::copy(__first2, __last2, std::copy(__first1, __last1,
- __result));
}
- template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
- typename _Distance>
+ template<typename _RandomAccessIterator, typename _Size>
void
- __merge_sort_loop(_RandomAccessIterator1 __first,
- _RandomAccessIterator1 __last,
- _RandomAccessIterator2 __result,
- _Distance __step_size)
+ __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Size __depth_limit)
{
- const _Distance __two_step = 2 * __step_size;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
- while (__last - __first >= __two_step)
+ while (__last - __first > 3)
{
- __result = std::merge(__first, __first + __step_size,
- __first + __step_size, __first + __two_step,
- __result);
- __first += __two_step;
+ if (__depth_limit == 0)
+ {
+ std::__heap_select(__first, __nth + 1, __last);
+ // Place the nth largest element in its final position.
+ std::iter_swap(__first, __nth);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition(__first, __last,
+ _ValueType(std::__median(*__first,
+ *(__first
+ + (__last
+ - __first)
+ / 2),
+ *(__last
+ - 1))));
+ if (__cut <= __nth)
+ __first = __cut;
+ else
+ __last = __cut;
}
-
- __step_size = std::min(_Distance(__last - __first), __step_size);
- std::merge(__first, __first + __step_size, __first + __step_size, __last,
- __result);
+ std::__insertion_sort(__first, __last);
}
- template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
- typename _Distance, typename _Compare>
+ template<typename _RandomAccessIterator, typename _Size, typename _Compare>
void
- __merge_sort_loop(_RandomAccessIterator1 __first,
- _RandomAccessIterator1 __last,
- _RandomAccessIterator2 __result, _Distance __step_size,
- _Compare __comp)
+ __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Size __depth_limit,
+ _Compare __comp)
{
- const _Distance __two_step = 2 * __step_size;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
- while (__last - __first >= __two_step)
+ while (__last - __first > 3)
{
- __result = std::merge(__first, __first + __step_size,
- __first + __step_size, __first + __two_step,
- __result,
- __comp);
- __first += __two_step;
+ if (__depth_limit == 0)
+ {
+ std::__heap_select(__first, __nth + 1, __last, __comp);
+ // Place the nth largest element in its final position.
+ std::iter_swap(__first, __nth);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition(__first, __last,
+ _ValueType(std::__median(*__first,
+ *(__first
+ + (__last
+ - __first)
+ / 2),
+ *(__last - 1),
+ __comp)),
+ __comp);
+ if (__cut <= __nth)
+ __first = __cut;
+ else
+ __last = __cut;
}
- __step_size = std::min(_Distance(__last - __first), __step_size);
-
- std::merge(__first, __first + __step_size,
- __first + __step_size, __last,
- __result,
- __comp);
+ std::__insertion_sort(__first, __last, __comp);
}
- enum { _S_chunk_size = 7 };
-
- template<typename _RandomAccessIterator, typename _Distance>
- void
- __chunk_insertion_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Distance __chunk_size)
- {
- while (__last - __first >= __chunk_size)
- {
- std::__insertion_sort(__first, __first + __chunk_size);
- __first += __chunk_size;
- }
- std::__insertion_sort(__first, __last);
- }
-
- template<typename _RandomAccessIterator, typename _Distance, typename _Compare>
- void
- __chunk_insertion_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Distance __chunk_size, _Compare __comp)
- {
- while (__last - __first >= __chunk_size)
- {
- std::__insertion_sort(__first, __first + __chunk_size, __comp);
- __first += __chunk_size;
- }
- std::__insertion_sort(__first, __last, __comp);
- }
-
- template<typename _RandomAccessIterator, typename _Pointer>
- void
- __merge_sort_with_buffer(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Pointer __buffer)
+ /**
+ * @brief Sort a sequence just enough to find a particular position.
+ * @param first An iterator.
+ * @param nth Another iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Rearranges the elements in the range @p [first,last) so that @p *nth
+ * is the same element that would have been in that position had the
+ * whole sequence been sorted.
+ * whole sequence been sorted. The elements either side of @p *nth are
+ * not completely sorted, but for any iterator @i in the range
+ * @p [first,nth) and any iterator @j in the range @p [nth,last) it
+ * holds that @p *j<*i is false.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type
- _Distance;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
- const _Distance __len = __last - __first;
- const _Pointer __buffer_last = __buffer + __len;
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __nth);
+ __glibcxx_requires_valid_range(__nth, __last);
- _Distance __step_size = _S_chunk_size;
- std::__chunk_insertion_sort(__first, __last, __step_size);
+ if (__first == __last || __nth == __last)
+ return;
- while (__step_size < __len)
- {
- std::__merge_sort_loop(__first, __last, __buffer, __step_size);
- __step_size *= 2;
- std::__merge_sort_loop(__buffer, __buffer_last, __first, __step_size);
- __step_size *= 2;
- }
+ std::__introselect(__first, __nth, __last,
+ std::__lg(__last - __first) * 2);
}
- template<typename _RandomAccessIterator, typename _Pointer, typename _Compare>
- void
- __merge_sort_with_buffer(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Pointer __buffer, _Compare __comp)
+ /**
+ * @brief Sort a sequence just enough to find a particular position
+ * using a predicate for comparison.
+ * @param first An iterator.
+ * @param nth Another iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Rearranges the elements in the range @p [first,last) so that @p *nth
+ * is the same element that would have been in that position had the
+ * whole sequence been sorted. The elements either side of @p *nth are
+ * not completely sorted, but for any iterator @i in the range
+ * @p [first,nth) and any iterator @j in the range @p [nth,last) it
+ * holds that @p comp(*j,*i) is false.
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type
- _Distance;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
- const _Distance __len = __last - __first;
- const _Pointer __buffer_last = __buffer + __len;
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _ValueType>)
+ __glibcxx_requires_valid_range(__first, __nth);
+ __glibcxx_requires_valid_range(__nth, __last);
- _Distance __step_size = _S_chunk_size;
- std::__chunk_insertion_sort(__first, __last, __step_size, __comp);
+ if (__first == __last || __nth == __last)
+ return;
- while (__step_size < __len)
- {
- std::__merge_sort_loop(__first, __last, __buffer,
- __step_size, __comp);
- __step_size *= 2;
- std::__merge_sort_loop(__buffer, __buffer_last, __first,
- __step_size, __comp);
- __step_size *= 2;
- }
+ std::__introselect(__first, __nth, __last,
+ std::__lg(__last - __first) * 2, __comp);
}
/**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
+ * @brief Finds the first position in which @a val could be inserted
+ * without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return An iterator pointing to the first element "not less than" @a val,
+ * or end() if every element is less than @a val.
+ * @ingroup binarysearch
*/
- template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
- typename _BidirectionalIterator3>
- _BidirectionalIterator3
- __merge_backward(_BidirectionalIterator1 __first1,
- _BidirectionalIterator1 __last1,
- _BidirectionalIterator2 __first2,
- _BidirectionalIterator2 __last2,
- _BidirectionalIterator3 __result)
+ template<typename _ForwardIterator, typename _Tp>
+ _ForwardIterator
+ lower_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
{
- if (__first1 == __last1)
- return std::copy_backward(__first2, __last2, __result);
- if (__first2 == __last2)
- return std::copy_backward(__first1, __last1, __result);
- --__last1;
- --__last2;
- while (true)
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>)
+ __glibcxx_requires_partitioned(__first, __last, __val);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
{
- if (*__last2 < *__last1)
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (*__middle < __val)
{
- *--__result = *__last1;
- if (__first1 == __last1)
- return std::copy_backward(__first2, ++__last2, __result);
- --__last1;
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
}
else
- {
- *--__result = *__last2;
- if (__first2 == __last2)
- return std::copy_backward(__first1, ++__last1, __result);
- --__last2;
- }
+ __len = __half;
}
+ return __first;
}
/**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
+ * @brief Finds the first position in which @a val could be inserted
+ * without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return An iterator pointing to the first element "not less than" @a val,
+ * or end() if every element is less than @a val.
+ * @ingroup binarysearch
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
*/
- template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
- typename _BidirectionalIterator3, typename _Compare>
- _BidirectionalIterator3
- __merge_backward(_BidirectionalIterator1 __first1,
- _BidirectionalIterator1 __last1,
- _BidirectionalIterator2 __first2,
- _BidirectionalIterator2 __last2,
- _BidirectionalIterator3 __result,
- _Compare __comp)
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ _ForwardIterator
+ lower_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val, _Compare __comp)
{
- if (__first1 == __last1)
- return std::copy_backward(__first2, __last2, __result);
- if (__first2 == __last2)
- return std::copy_backward(__first1, __last1, __result);
- --__last1;
- --__last2;
- while (true)
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _Tp>)
+ __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
{
- if (__comp(*__last2, *__last1))
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(*__middle, __val))
{
- *--__result = *__last1;
- if (__first1 == __last1)
- return std::copy_backward(__first2, ++__last2, __result);
- --__last1;
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
}
else
- {
- *--__result = *__last2;
- if (__first2 == __last2)
- return std::copy_backward(__first1, ++__last1, __result);
- --__last2;
- }
+ __len = __half;
}
+ return __first;
}
/**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
+ * @brief Finds the last position in which @a val could be inserted
+ * without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return An iterator pointing to the first element greater than @a val,
+ * or end() if no elements are greater than @a val.
+ * @ingroup binarysearch
*/
- template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
- typename _Distance>
- _BidirectionalIterator1
- __rotate_adaptive(_BidirectionalIterator1 __first,
- _BidirectionalIterator1 __middle,
- _BidirectionalIterator1 __last,
- _Distance __len1, _Distance __len2,
- _BidirectionalIterator2 __buffer,
- _Distance __buffer_size)
+ template<typename _ForwardIterator, typename _Tp>
+ _ForwardIterator
+ upper_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
{
- _BidirectionalIterator2 __buffer_end;
- if (__len1 > __len2 && __len2 <= __buffer_size)
- {
- __buffer_end = std::copy(__middle, __last, __buffer);
- std::copy_backward(__first, __middle, __last);
- return std::copy(__buffer, __buffer_end, __first);
- }
- else if (__len1 <= __buffer_size)
- {
- __buffer_end = std::copy(__first, __middle, __buffer);
- std::copy(__middle, __last, __first);
- return std::copy_backward(__buffer, __buffer_end, __last);
- }
- else
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned(__first, __last, __val);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
{
- std::rotate(__first, __middle, __last);
- std::advance(__first, std::distance(__middle, __last));
- return __first;
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__val < *__middle)
+ __len = __half;
+ else
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
}
+ return __first;
}
/**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
+ * @brief Finds the last position in which @a val could be inserted
+ * without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return An iterator pointing to the first element greater than @a val,
+ * or end() if no elements are greater than @a val.
+ * @ingroup binarysearch
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
*/
- template<typename _BidirectionalIterator, typename _Distance,
- typename _Pointer>
- void
- __merge_adaptive(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last,
- _Distance __len1, _Distance __len2,
- _Pointer __buffer, _Distance __buffer_size)
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ _ForwardIterator
+ upper_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val, _Compare __comp)
{
- if (__len1 <= __len2 && __len1 <= __buffer_size)
- {
- _Pointer __buffer_end = std::copy(__first, __middle, __buffer);
- std::merge(__buffer, __buffer_end, __middle, __last, __first);
- }
- else if (__len2 <= __buffer_size)
- {
- _Pointer __buffer_end = std::copy(__middle, __last, __buffer);
- std::__merge_backward(__first, __middle, __buffer,
- __buffer_end, __last);
- }
- else
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
{
- _BidirectionalIterator __first_cut = __first;
- _BidirectionalIterator __second_cut = __middle;
- _Distance __len11 = 0;
- _Distance __len22 = 0;
- if (__len1 > __len2)
- {
- __len11 = __len1 / 2;
- std::advance(__first_cut, __len11);
- __second_cut = std::lower_bound(__middle, __last,
- *__first_cut);
- __len22 = std::distance(__middle, __second_cut);
- }
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(__val, *__middle))
+ __len = __half;
else
{
- __len22 = __len2 / 2;
- std::advance(__second_cut, __len22);
- __first_cut = std::upper_bound(__first, __middle,
- *__second_cut);
- __len11 = std::distance(__first, __first_cut);
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
}
- _BidirectionalIterator __new_middle =
- std::__rotate_adaptive(__first_cut, __middle, __second_cut,
- __len1 - __len11, __len22, __buffer,
- __buffer_size);
- std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
- __len22, __buffer, __buffer_size);
- std::__merge_adaptive(__new_middle, __second_cut, __last,
- __len1 - __len11,
- __len2 - __len22, __buffer, __buffer_size);
}
+ return __first;
}
/**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
+ * @brief Finds the largest subrange in which @a val could be inserted
+ * at any place in it without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return An pair of iterators defining the subrange.
+ * @ingroup binarysearch
+ *
+ * This is equivalent to
+ * @code
+ * std::make_pair(lower_bound(first, last, val),
+ * upper_bound(first, last, val))
+ * @endcode
+ * but does not actually call those functions.
*/
- template<typename _BidirectionalIterator, typename _Distance, typename _Pointer,
- typename _Compare>
- void
- __merge_adaptive(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last,
- _Distance __len1, _Distance __len2,
- _Pointer __buffer, _Distance __buffer_size,
- _Compare __comp)
+ template<typename _ForwardIterator, typename _Tp>
+ pair<_ForwardIterator, _ForwardIterator>
+ equal_range(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
{
- if (__len1 <= __len2 && __len1 <= __buffer_size)
- {
- _Pointer __buffer_end = std::copy(__first, __middle, __buffer);
- std::merge(__buffer, __buffer_end, __middle, __last, __first, __comp);
- }
- else if (__len2 <= __buffer_size)
- {
- _Pointer __buffer_end = std::copy(__middle, __last, __buffer);
- std::__merge_backward(__first, __middle, __buffer, __buffer_end,
- __last, __comp);
- }
- else
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>)
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned(__first, __last, __val);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle, __left, __right;
+
+ while (__len > 0)
{
- _BidirectionalIterator __first_cut = __first;
- _BidirectionalIterator __second_cut = __middle;
- _Distance __len11 = 0;
- _Distance __len22 = 0;
- if (__len1 > __len2)
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (*__middle < __val)
{
- __len11 = __len1 / 2;
- std::advance(__first_cut, __len11);
- __second_cut = std::lower_bound(__middle, __last, *__first_cut,
- __comp);
- __len22 = std::distance(__middle, __second_cut);
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
}
+ else if (__val < *__middle)
+ __len = __half;
else
{
- __len22 = __len2 / 2;
- std::advance(__second_cut, __len22);
- __first_cut = std::upper_bound(__first, __middle, *__second_cut,
- __comp);
- __len11 = std::distance(__first, __first_cut);
+ __left = std::lower_bound(__first, __middle, __val);
+ std::advance(__first, __len);
+ __right = std::upper_bound(++__middle, __first, __val);
+ return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
}
- _BidirectionalIterator __new_middle =
- std::__rotate_adaptive(__first_cut, __middle, __second_cut,
- __len1 - __len11, __len22, __buffer,
- __buffer_size);
- std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
- __len22, __buffer, __buffer_size, __comp);
- std::__merge_adaptive(__new_middle, __second_cut, __last,
- __len1 - __len11,
- __len2 - __len22, __buffer,
- __buffer_size, __comp);
}
+ return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
}
/**
- * @brief Merges two sorted ranges in place.
+ * @brief Finds the largest subrange in which @a val could be inserted
+ * at any place in it without changing the ordering.
* @param first An iterator.
- * @param middle Another iterator.
* @param last Another iterator.
- * @return Nothing.
- *
- * Merges two sorted and consecutive ranges, [first,middle) and
- * [middle,last), and puts the result in [first,last). The output will
- * be sorted. The sort is @e stable, that is, for equivalent
- * elements in the two ranges, elements from the first range will always
- * come before elements from the second.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return An pair of iterators defining the subrange.
+ * @ingroup binarysearch
*
- * If enough additional memory is available, this takes (last-first)-1
- * comparisons. Otherwise an NlogN algorithm is used, where N is
- * distance(first,last).
+ * This is equivalent to
+ * @code
+ * std::make_pair(lower_bound(first, last, val, comp),
+ * upper_bound(first, last, val, comp))
+ * @endcode
+ * but does not actually call those functions.
*/
- template<typename _BidirectionalIterator>
- void
- inplace_merge(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last)
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ pair<_ForwardIterator, _ForwardIterator>
+ equal_range(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val,
+ _Compare __comp)
{
- typedef typename iterator_traits<_BidirectionalIterator>::value_type
- _ValueType;
- typedef typename iterator_traits<_BidirectionalIterator>::difference_type
- _DistanceType;
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
// concept requirements
- __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
- _BidirectionalIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
- __glibcxx_requires_sorted(__first, __middle);
- __glibcxx_requires_sorted(__middle, __last);
-
- if (__first == __middle || __middle == __last)
- return;
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _Tp>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
- _DistanceType __len1 = std::distance(__first, __middle);
- _DistanceType __len2 = std::distance(__middle, __last);
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle, __left, __right;
- _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first,
- __last);
- if (__buf.begin() == 0)
- std::__merge_without_buffer(__first, __middle, __last, __len1, __len2);
- else
- std::__merge_adaptive(__first, __middle, __last, __len1, __len2,
- __buf.begin(), _DistanceType(__buf.size()));
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(*__middle, __val))
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else if (__comp(__val, *__middle))
+ __len = __half;
+ else
+ {
+ __left = std::lower_bound(__first, __middle, __val, __comp);
+ std::advance(__first, __len);
+ __right = std::upper_bound(++__middle, __first, __val, __comp);
+ return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
+ }
+ }
+ return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
}
/**
- * @brief Merges two sorted ranges in place.
+ * @brief Determines whether an element exists in a range.
* @param first An iterator.
- * @param middle Another iterator.
* @param last Another iterator.
- * @param comp A functor to use for comparisons.
- * @return Nothing.
- *
- * Merges two sorted and consecutive ranges, [first,middle) and
- * [middle,last), and puts the result in [first,last). The output will
- * be sorted. The sort is @e stable, that is, for equivalent
- * elements in the two ranges, elements from the first range will always
- * come before elements from the second.
- *
- * If enough additional memory is available, this takes (last-first)-1
- * comparisons. Otherwise an NlogN algorithm is used, where N is
- * distance(first,last).
+ * @param val The search term.
+ * @return True if @a val (or its equivelent) is in [@a first,@a last ].
+ * @ingroup binarysearch
*
- * The comparison function should have the same effects on ordering as
- * the function used for the initial sort.
+ * Note that this does not actually return an iterator to @a val. For
+ * that, use std::find or a container's specialized find member functions.
*/
- template<typename _BidirectionalIterator, typename _Compare>
- void
- inplace_merge(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last,
- _Compare __comp)
+ template<typename _ForwardIterator, typename _Tp>
+ bool
+ binary_search(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
{
- typedef typename iterator_traits<_BidirectionalIterator>::value_type
- _ValueType;
- typedef typename iterator_traits<_BidirectionalIterator>::difference_type
- _DistanceType;
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
// concept requirements
- __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
- _BidirectionalIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType, _ValueType>)
- __glibcxx_requires_sorted_pred(__first, __middle, __comp);
- __glibcxx_requires_sorted_pred(__middle, __last, __comp);
-
- if (__first == __middle || __middle == __last)
- return;
-
- const _DistanceType __len1 = std::distance(__first, __middle);
- const _DistanceType __len2 = std::distance(__middle, __last);
-
- _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first,
- __last);
- if (__buf.begin() == 0)
- std::__merge_without_buffer(__first, __middle, __last, __len1,
- __len2, __comp);
- else
- std::__merge_adaptive(__first, __middle, __last, __len1, __len2,
- __buf.begin(), _DistanceType(__buf.size()),
- __comp);
- }
-
- template<typename _RandomAccessIterator, typename _Pointer,
- typename _Distance>
- void
- __stable_sort_adaptive(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Pointer __buffer, _Distance __buffer_size)
- {
- const _Distance __len = (__last - __first + 1) / 2;
- const _RandomAccessIterator __middle = __first + __len;
- if (__len > __buffer_size)
- {
- std::__stable_sort_adaptive(__first, __middle,
- __buffer, __buffer_size);
- std::__stable_sort_adaptive(__middle, __last,
- __buffer, __buffer_size);
- }
- else
- {
- std::__merge_sort_with_buffer(__first, __middle, __buffer);
- std::__merge_sort_with_buffer(__middle, __last, __buffer);
- }
- std::__merge_adaptive(__first, __middle, __last,
- _Distance(__middle - __first),
- _Distance(__last - __middle),
- __buffer, __buffer_size);
- }
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned(__first, __last, __val);
- template<typename _RandomAccessIterator, typename _Pointer,
- typename _Distance, typename _Compare>
- void
- __stable_sort_adaptive(_RandomAccessIterator __first,
- _RandomAccessIterator __last,
- _Pointer __buffer, _Distance __buffer_size,
- _Compare __comp)
- {
- const _Distance __len = (__last - __first + 1) / 2;
- const _RandomAccessIterator __middle = __first + __len;
- if (__len > __buffer_size)
- {
- std::__stable_sort_adaptive(__first, __middle, __buffer,
- __buffer_size, __comp);
- std::__stable_sort_adaptive(__middle, __last, __buffer,
- __buffer_size, __comp);
- }
- else
- {
- std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp);
- std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp);
- }
- std::__merge_adaptive(__first, __middle, __last,
- _Distance(__middle - __first),
- _Distance(__last - __middle),
- __buffer, __buffer_size,
- __comp);
+ _ForwardIterator __i = std::lower_bound(__first, __last, __val);
+ return __i != __last && !(__val < *__i);
}
/**
- * @brief Sort the elements of a sequence, preserving the relative order
- * of equivalent elements.
+ * @brief Determines whether an element exists in a range.
* @param first An iterator.
* @param last Another iterator.
- * @return Nothing.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return True if @a val (or its equivelent) is in [@a first,@a last ].
+ * @ingroup binarysearch
*
- * Sorts the elements in the range @p [first,last) in ascending order,
- * such that @p *(i+1)<*i is false for each iterator @p i in the range
- * @p [first,last-1).
+ * Note that this does not actually return an iterator to @a val. For
+ * that, use std::find or a container's specialized find member functions.
*
- * The relative ordering of equivalent elements is preserved, so any two
- * elements @p x and @p y in the range @p [first,last) such that
- * @p x<y is false and @p y<x is false will have the same relative
- * ordering after calling @p stable_sort().
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
*/
- template<typename _RandomAccessIterator>
- inline void
- stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ bool
+ binary_search(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val, _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ typedef typename iterator_traits<_ForwardIterator>::value_type
_ValueType;
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type
- _DistanceType;
// concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
- __glibcxx_requires_valid_range(__first, __last);
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
- _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first,
- __last);
- if (__buf.begin() == 0)
- std::__inplace_stable_sort(__first, __last);
- else
- std::__stable_sort_adaptive(__first, __last, __buf.begin(),
- _DistanceType(__buf.size()));
+ _ForwardIterator __i = std::lower_bound(__first, __last, __val, __comp);
+ return __i != __last && !bool(__comp(__val, *__i));
}
/**
- * @brief Sort the elements of a sequence using a predicate for comparison,
- * preserving the relative order of equivalent elements.
- * @param first An iterator.
- * @param last Another iterator.
- * @param comp A comparison functor.
- * @return Nothing.
- *
- * Sorts the elements in the range @p [first,last) in ascending order,
- * such that @p comp(*(i+1),*i) is false for each iterator @p i in the
- * range @p [first,last-1).
+ * @brief Merges two sorted ranges.
+ * @param first1 An iterator.
+ * @param first2 Another iterator.
+ * @param last1 Another iterator.
+ * @param last2 Another iterator.
+ * @param result An iterator pointing to the end of the merged range.
+ * @return An iterator pointing to the first element "not less than" @a val.
*
- * The relative ordering of equivalent elements is preserved, so any two
- * elements @p x and @p y in the range @p [first,last) such that
- * @p comp(x,y) is false and @p comp(y,x) is false will have the same
- * relative ordering after calling @p stable_sort().
+ * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
+ * [result, result + (last1-first1) + (last2-first2)). Both input ranges
+ * must be sorted, and the output range must not overlap with either of
+ * the input ranges. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
*/
- template<typename _RandomAccessIterator, typename _Compare>
- inline void
- stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Compare __comp)
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ merge(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type
- _DistanceType;
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
// concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType,
- _ValueType>)
- __glibcxx_requires_valid_range(__first, __last);
-
- _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first,
- __last);
- if (__buf.begin() == 0)
- std::__inplace_stable_sort(__first, __last, __comp);
- else
- std::__stable_sort_adaptive(__first, __last, __buf.begin(),
- _DistanceType(__buf.size()), __comp);
- }
-
-
- template<typename _RandomAccessIterator, typename _Size>
- void
- __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth,
- _RandomAccessIterator __last, _Size __depth_limit)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted(__first1, __last1);
+ __glibcxx_requires_sorted(__first2, __last2);
- while (__last - __first > 3)
+ while (__first1 != __last1 && __first2 != __last2)
{
- if (__depth_limit == 0)
+ if (*__first2 < *__first1)
{
- std::__heap_select(__first, __nth + 1, __last);
- // Place the nth largest element in its final position.
- std::iter_swap(__first, __nth);
- return;
+ *__result = *__first2;
+ ++__first2;
}
- --__depth_limit;
- _RandomAccessIterator __cut =
- std::__unguarded_partition(__first, __last,
- _ValueType(std::__median(*__first,
- *(__first
- + (__last
- - __first)
- / 2),
- *(__last
- - 1))));
- if (__cut <= __nth)
- __first = __cut;
else
- __last = __cut;
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ ++__result;
}
- std::__insertion_sort(__first, __last);
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
}
- template<typename _RandomAccessIterator, typename _Size, typename _Compare>
- void
- __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth,
- _RandomAccessIterator __last, _Size __depth_limit,
- _Compare __comp)
+ /**
+ * @brief Merges two sorted ranges.
+ * @param first1 An iterator.
+ * @param first2 Another iterator.
+ * @param last1 Another iterator.
+ * @param last2 Another iterator.
+ * @param result An iterator pointing to the end of the merged range.
+ * @param comp A functor to use for comparisons.
+ * @return An iterator pointing to the first element "not less than" @a val.
+ *
+ * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
+ * [result, result + (last1-first1) + (last2-first2)). Both input ranges
+ * must be sorted, and the output range must not overlap with either of
+ * the input ranges. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ merge(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
- while (__last - __first > 3)
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
+ __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
{
- if (__depth_limit == 0)
+ if (__comp(*__first2, *__first1))
{
- std::__heap_select(__first, __nth + 1, __last, __comp);
- // Place the nth largest element in its final position.
- std::iter_swap(__first, __nth);
- return;
+ *__result = *__first2;
+ ++__first2;
}
- --__depth_limit;
- _RandomAccessIterator __cut =
- std::__unguarded_partition(__first, __last,
- _ValueType(std::__median(*__first,
- *(__first
- + (__last
- - __first)
- / 2),
- *(__last - 1),
- __comp)),
- __comp);
- if (__cut <= __nth)
- __first = __cut;
else
- __last = __cut;
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ ++__result;
}
- std::__insertion_sort(__first, __last, __comp);
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
}
/**
- * @brief Sort a sequence just enough to find a particular position.
- * @param first An iterator.
- * @param nth Another iterator.
- * @param last Another iterator.
- * @return Nothing.
- *
- * Rearranges the elements in the range @p [first,last) so that @p *nth
- * is the same element that would have been in that position had the
- * whole sequence been sorted.
- * whole sequence been sorted. The elements either side of @p *nth are
- * not completely sorted, but for any iterator @i in the range
- * @p [first,nth) and any iterator @j in the range @p [nth,last) it
- * holds that @p *j<*i is false.
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
*/
- template<typename _RandomAccessIterator>
- inline void
- nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth,
- _RandomAccessIterator __last)
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _BidirectionalIterator3>
+ _BidirectionalIterator3
+ __merge_backward(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ _BidirectionalIterator3 __result)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
- __glibcxx_requires_valid_range(__first, __nth);
- __glibcxx_requires_valid_range(__nth, __last);
-
- if (__first == __last || __nth == __last)
- return;
-
- std::__introselect(__first, __nth, __last,
- std::__lg(__last - __first) * 2);
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, __last2, __result);
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, __last1, __result);
+ --__last1;
+ --__last2;
+ while (true)
+ {
+ if (*__last2 < *__last1)
+ {
+ *--__result = *__last1;
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, ++__last2, __result);
+ --__last1;
+ }
+ else
+ {
+ *--__result = *__last2;
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, ++__last1, __result);
+ --__last2;
+ }
+ }
}
/**
- * @brief Sort a sequence just enough to find a particular position
- * using a predicate for comparison.
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _BidirectionalIterator3, typename _Compare>
+ _BidirectionalIterator3
+ __merge_backward(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ _BidirectionalIterator3 __result,
+ _Compare __comp)
+ {
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, __last2, __result);
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, __last1, __result);
+ --__last1;
+ --__last2;
+ while (true)
+ {
+ if (__comp(*__last2, *__last1))
+ {
+ *--__result = *__last1;
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, ++__last2, __result);
+ --__last1;
+ }
+ else
+ {
+ *--__result = *__last2;
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, ++__last1, __result);
+ --__last2;
+ }
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _Distance>
+ _BidirectionalIterator1
+ __rotate_adaptive(_BidirectionalIterator1 __first,
+ _BidirectionalIterator1 __middle,
+ _BidirectionalIterator1 __last,
+ _Distance __len1, _Distance __len2,
+ _BidirectionalIterator2 __buffer,
+ _Distance __buffer_size)
+ {
+ _BidirectionalIterator2 __buffer_end;
+ if (__len1 > __len2 && __len2 <= __buffer_size)
+ {
+ __buffer_end = std::copy(__middle, __last, __buffer);
+ std::copy_backward(__first, __middle, __last);
+ return std::copy(__buffer, __buffer_end, __first);
+ }
+ else if (__len1 <= __buffer_size)
+ {
+ __buffer_end = std::copy(__first, __middle, __buffer);
+ std::copy(__middle, __last, __first);
+ return std::copy_backward(__buffer, __buffer_end, __last);
+ }
+ else
+ {
+ std::rotate(__first, __middle, __last);
+ std::advance(__first, std::distance(__middle, __last));
+ return __first;
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Distance,
+ typename _Pointer>
+ void
+ __merge_adaptive(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2,
+ _Pointer __buffer, _Distance __buffer_size)
+ {
+ if (__len1 <= __len2 && __len1 <= __buffer_size)
+ {
+ _Pointer __buffer_end = std::copy(__first, __middle, __buffer);
+ std::merge(__buffer, __buffer_end, __middle, __last, __first);
+ }
+ else if (__len2 <= __buffer_size)
+ {
+ _Pointer __buffer_end = std::copy(__middle, __last, __buffer);
+ std::__merge_backward(__first, __middle, __buffer,
+ __buffer_end, __last);
+ }
+ else
+ {
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last,
+ *__first_cut);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle,
+ *__second_cut);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ _BidirectionalIterator __new_middle =
+ std::__rotate_adaptive(__first_cut, __middle, __second_cut,
+ __len1 - __len11, __len22, __buffer,
+ __buffer_size);
+ std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
+ __len22, __buffer, __buffer_size);
+ std::__merge_adaptive(__new_middle, __second_cut, __last,
+ __len1 - __len11,
+ __len2 - __len22, __buffer, __buffer_size);
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Distance, typename _Pointer,
+ typename _Compare>
+ void
+ __merge_adaptive(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2,
+ _Pointer __buffer, _Distance __buffer_size,
+ _Compare __comp)
+ {
+ if (__len1 <= __len2 && __len1 <= __buffer_size)
+ {
+ _Pointer __buffer_end = std::copy(__first, __middle, __buffer);
+ std::merge(__buffer, __buffer_end, __middle, __last, __first, __comp);
+ }
+ else if (__len2 <= __buffer_size)
+ {
+ _Pointer __buffer_end = std::copy(__middle, __last, __buffer);
+ std::__merge_backward(__first, __middle, __buffer, __buffer_end,
+ __last, __comp);
+ }
+ else
+ {
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut,
+ __comp);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut,
+ __comp);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ _BidirectionalIterator __new_middle =
+ std::__rotate_adaptive(__first_cut, __middle, __second_cut,
+ __len1 - __len11, __len22, __buffer,
+ __buffer_size);
+ std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
+ __len22, __buffer, __buffer_size, __comp);
+ std::__merge_adaptive(__new_middle, __second_cut, __last,
+ __len1 - __len11,
+ __len2 - __len22, __buffer,
+ __buffer_size, __comp);
+ }
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Distance>
+ void
+ __merge_without_buffer(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2)
+ {
+ if (__len1 == 0 || __len2 == 0)
+ return;
+ if (__len1 + __len2 == 2)
+ {
+ if (*__middle < *__first)
+ std::iter_swap(__first, __middle);
+ return;
+ }
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ std::rotate(__first_cut, __middle, __second_cut);
+ _BidirectionalIterator __new_middle = __first_cut;
+ std::advance(__new_middle, std::distance(__middle, __second_cut));
+ std::__merge_without_buffer(__first, __first_cut, __new_middle,
+ __len11, __len22);
+ std::__merge_without_buffer(__new_middle, __second_cut, __last,
+ __len1 - __len11, __len2 - __len22);
+ }
+
+ /**
+ * @if maint
+ * This is a helper function for the merge routines.
+ * @endif
+ */
+ template<typename _BidirectionalIterator, typename _Distance,
+ typename _Compare>
+ void
+ __merge_without_buffer(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2,
+ _Compare __comp)
+ {
+ if (__len1 == 0 || __len2 == 0)
+ return;
+ if (__len1 + __len2 == 2)
+ {
+ if (__comp(*__middle, *__first))
+ std::iter_swap(__first, __middle);
+ return;
+ }
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut,
+ __comp);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut,
+ __comp);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ std::rotate(__first_cut, __middle, __second_cut);
+ _BidirectionalIterator __new_middle = __first_cut;
+ std::advance(__new_middle, std::distance(__middle, __second_cut));
+ std::__merge_without_buffer(__first, __first_cut, __new_middle,
+ __len11, __len22, __comp);
+ std::__merge_without_buffer(__new_middle, __second_cut, __last,
+ __len1 - __len11, __len2 - __len22, __comp);
+ }
+
+ /**
+ * @brief Merges two sorted ranges in place.
* @param first An iterator.
- * @param nth Another iterator.
+ * @param middle Another iterator.
* @param last Another iterator.
- * @param comp A comparison functor.
* @return Nothing.
*
- * Rearranges the elements in the range @p [first,last) so that @p *nth
- * is the same element that would have been in that position had the
- * whole sequence been sorted. The elements either side of @p *nth are
- * not completely sorted, but for any iterator @i in the range
- * @p [first,nth) and any iterator @j in the range @p [nth,last) it
- * holds that @p comp(*j,*i) is false.
+ * Merges two sorted and consecutive ranges, [first,middle) and
+ * [middle,last), and puts the result in [first,last). The output will
+ * be sorted. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ *
+ * If enough additional memory is available, this takes (last-first)-1
+ * comparisons. Otherwise an NlogN algorithm is used, where N is
+ * distance(first,last).
*/
- template<typename _RandomAccessIterator, typename _Compare>
- inline void
- nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth,
- _RandomAccessIterator __last, _Compare __comp)
+ template<typename _BidirectionalIterator>
+ void
+ inplace_merge(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type
- _ValueType;
+ typedef typename iterator_traits<_BidirectionalIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_BidirectionalIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_sorted(__first, __middle);
+ __glibcxx_requires_sorted(__middle, __last);
+
+ if (__first == __middle || __middle == __last)
+ return;
+
+ _DistanceType __len1 = std::distance(__first, __middle);
+ _DistanceType __len2 = std::distance(__middle, __last);
+
+ _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__merge_without_buffer(__first, __middle, __last, __len1, __len2);
+ else
+ std::__merge_adaptive(__first, __middle, __last, __len1, __len2,
+ __buf.begin(), _DistanceType(__buf.size()));
+ }
+
+ /**
+ * @brief Merges two sorted ranges in place.
+ * @param first An iterator.
+ * @param middle Another iterator.
+ * @param last Another iterator.
+ * @param comp A functor to use for comparisons.
+ * @return Nothing.
+ *
+ * Merges two sorted and consecutive ranges, [first,middle) and
+ * [middle,last), and puts the result in [first,last). The output will
+ * be sorted. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ *
+ * If enough additional memory is available, this takes (last-first)-1
+ * comparisons. Otherwise an NlogN algorithm is used, where N is
+ * distance(first,last).
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
+ */
+ template<typename _BidirectionalIterator, typename _Compare>
+ void
+ inplace_merge(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_BidirectionalIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_BidirectionalIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _ValueType>)
+ __glibcxx_requires_sorted_pred(__first, __middle, __comp);
+ __glibcxx_requires_sorted_pred(__middle, __last, __comp);
+
+ if (__first == __middle || __middle == __last)
+ return;
+
+ const _DistanceType __len1 = std::distance(__first, __middle);
+ const _DistanceType __len2 = std::distance(__middle, __last);
+
+ _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__merge_without_buffer(__first, __middle, __last, __len1,
+ __len2, __comp);
+ else
+ std::__merge_adaptive(__first, __middle, __last, __len1, __len2,
+ __buf.begin(), _DistanceType(__buf.size()),
+ __comp);
+ }
+
+ template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
+ typename _Distance>
+ void
+ __merge_sort_loop(_RandomAccessIterator1 __first,
+ _RandomAccessIterator1 __last,
+ _RandomAccessIterator2 __result,
+ _Distance __step_size)
+ {
+ const _Distance __two_step = 2 * __step_size;
+
+ while (__last - __first >= __two_step)
+ {
+ __result = std::merge(__first, __first + __step_size,
+ __first + __step_size, __first + __two_step,
+ __result);
+ __first += __two_step;
+ }
+
+ __step_size = std::min(_Distance(__last - __first), __step_size);
+ std::merge(__first, __first + __step_size, __first + __step_size, __last,
+ __result);
+ }
+
+ template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
+ typename _Distance, typename _Compare>
+ void
+ __merge_sort_loop(_RandomAccessIterator1 __first,
+ _RandomAccessIterator1 __last,
+ _RandomAccessIterator2 __result, _Distance __step_size,
+ _Compare __comp)
+ {
+ const _Distance __two_step = 2 * __step_size;
+
+ while (__last - __first >= __two_step)
+ {
+ __result = std::merge(__first, __first + __step_size,
+ __first + __step_size, __first + __two_step,
+ __result,
+ __comp);
+ __first += __two_step;
+ }
+ __step_size = std::min(_Distance(__last - __first), __step_size);
+
+ std::merge(__first, __first + __step_size,
+ __first + __step_size, __last,
+ __result,
+ __comp);
+ }
+
+ template<typename _RandomAccessIterator, typename _Distance>
+ void
+ __chunk_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Distance __chunk_size)
+ {
+ while (__last - __first >= __chunk_size)
+ {
+ std::__insertion_sort(__first, __first + __chunk_size);
+ __first += __chunk_size;
+ }
+ std::__insertion_sort(__first, __last);
+ }
+
+ template<typename _RandomAccessIterator, typename _Distance, typename _Compare>
+ void
+ __chunk_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Distance __chunk_size, _Compare __comp)
+ {
+ while (__last - __first >= __chunk_size)
+ {
+ std::__insertion_sort(__first, __first + __chunk_size, __comp);
+ __first += __chunk_size;
+ }
+ std::__insertion_sort(__first, __last, __comp);
+ }
+
+ enum { _S_chunk_size = 7 };
+
+ template<typename _RandomAccessIterator, typename _Pointer>
+ void
+ __merge_sort_with_buffer(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _Distance;
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType, _ValueType>)
- __glibcxx_requires_valid_range(__first, __nth);
- __glibcxx_requires_valid_range(__nth, __last);
+ const _Distance __len = __last - __first;
+ const _Pointer __buffer_last = __buffer + __len;
- if (__first == __last || __nth == __last)
- return;
+ _Distance __step_size = _S_chunk_size;
+ std::__chunk_insertion_sort(__first, __last, __step_size);
- std::__introselect(__first, __nth, __last,
- std::__lg(__last - __first) * 2, __comp);
+ while (__step_size < __len)
+ {
+ std::__merge_sort_loop(__first, __last, __buffer, __step_size);
+ __step_size *= 2;
+ std::__merge_sort_loop(__buffer, __buffer_last, __first, __step_size);
+ __step_size *= 2;
+ }
}
- /**
- * @brief Finds the largest subrange in which @a val could be inserted
- * at any place in it without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @return An pair of iterators defining the subrange.
- * @ingroup binarysearch
- *
- * This is equivalent to
- * @code
- * std::make_pair(lower_bound(first, last, val),
- * upper_bound(first, last, val))
- * @endcode
- * but does not actually call those functions.
- */
- template<typename _ForwardIterator, typename _Tp>
- pair<_ForwardIterator, _ForwardIterator>
- equal_range(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val)
+ template<typename _RandomAccessIterator, typename _Pointer, typename _Compare>
+ void
+ __merge_sort_with_buffer(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Compare __comp)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type
- _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type
- _DistanceType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _Distance;
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>)
- __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
- __glibcxx_requires_partitioned(__first, __last, __val);
+ const _Distance __len = __last - __first;
+ const _Pointer __buffer_last = __buffer + __len;
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle, __left, __right;
+ _Distance __step_size = _S_chunk_size;
+ std::__chunk_insertion_sort(__first, __last, __step_size, __comp);
- while (__len > 0)
+ while (__step_size < __len)
{
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (*__middle < __val)
- {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
- }
- else if (__val < *__middle)
- __len = __half;
- else
- {
- __left = std::lower_bound(__first, __middle, __val);
- std::advance(__first, __len);
- __right = std::upper_bound(++__middle, __first, __val);
- return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
- }
+ std::__merge_sort_loop(__first, __last, __buffer,
+ __step_size, __comp);
+ __step_size *= 2;
+ std::__merge_sort_loop(__buffer, __buffer_last, __first,
+ __step_size, __comp);
+ __step_size *= 2;
}
- return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
}
- /**
- * @brief Finds the largest subrange in which @a val could be inserted
- * at any place in it without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @param comp A functor to use for comparisons.
- * @return An pair of iterators defining the subrange.
- * @ingroup binarysearch
- *
- * This is equivalent to
- * @code
- * std::make_pair(lower_bound(first, last, val, comp),
- * upper_bound(first, last, val, comp))
- * @endcode
- * but does not actually call those functions.
- */
- template<typename _ForwardIterator, typename _Tp, typename _Compare>
- pair<_ForwardIterator, _ForwardIterator>
- equal_range(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val,
- _Compare __comp)
+ template<typename _RandomAccessIterator, typename _Pointer,
+ typename _Distance>
+ void
+ __stable_sort_adaptive(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Distance __buffer_size)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type
- _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type
- _DistanceType;
+ const _Distance __len = (__last - __first + 1) / 2;
+ const _RandomAccessIterator __middle = __first + __len;
+ if (__len > __buffer_size)
+ {
+ std::__stable_sort_adaptive(__first, __middle,
+ __buffer, __buffer_size);
+ std::__stable_sort_adaptive(__middle, __last,
+ __buffer, __buffer_size);
+ }
+ else
+ {
+ std::__merge_sort_with_buffer(__first, __middle, __buffer);
+ std::__merge_sort_with_buffer(__middle, __last, __buffer);
+ }
+ std::__merge_adaptive(__first, __middle, __last,
+ _Distance(__middle - __first),
+ _Distance(__last - __middle),
+ __buffer, __buffer_size);
+ }
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType, _Tp>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _Tp, _ValueType>)
- __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+ template<typename _RandomAccessIterator, typename _Pointer,
+ typename _Distance, typename _Compare>
+ void
+ __stable_sort_adaptive(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Distance __buffer_size,
+ _Compare __comp)
+ {
+ const _Distance __len = (__last - __first + 1) / 2;
+ const _RandomAccessIterator __middle = __first + __len;
+ if (__len > __buffer_size)
+ {
+ std::__stable_sort_adaptive(__first, __middle, __buffer,
+ __buffer_size, __comp);
+ std::__stable_sort_adaptive(__middle, __last, __buffer,
+ __buffer_size, __comp);
+ }
+ else
+ {
+ std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp);
+ std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp);
+ }
+ std::__merge_adaptive(__first, __middle, __last,
+ _Distance(__middle - __first),
+ _Distance(__last - __middle),
+ __buffer, __buffer_size,
+ __comp);
+ }
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle, __left, __right;
+ /**
+ * @if maint
+ * This is a helper function for the stable sorting routines.
+ * @endif
+ */
+ template<typename _RandomAccessIterator>
+ void
+ __inplace_stable_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
+ {
+ if (__last - __first < 15)
+ {
+ std::__insertion_sort(__first, __last);
+ return;
+ }
+ _RandomAccessIterator __middle = __first + (__last - __first) / 2;
+ std::__inplace_stable_sort(__first, __middle);
+ std::__inplace_stable_sort(__middle, __last);
+ std::__merge_without_buffer(__first, __middle, __last,
+ __middle - __first,
+ __last - __middle);
+ }
- while (__len > 0)
+ /**
+ * @if maint
+ * This is a helper function for the stable sorting routines.
+ * @endif
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __inplace_stable_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ if (__last - __first < 15)
{
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (__comp(*__middle, __val))
- {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
- }
- else if (__comp(__val, *__middle))
- __len = __half;
- else
- {
- __left = std::lower_bound(__first, __middle, __val, __comp);
- std::advance(__first, __len);
- __right = std::upper_bound(++__middle, __first, __val, __comp);
- return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
- }
+ std::__insertion_sort(__first, __last, __comp);
+ return;
}
- return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
+ _RandomAccessIterator __middle = __first + (__last - __first) / 2;
+ std::__inplace_stable_sort(__first, __middle, __comp);
+ std::__inplace_stable_sort(__middle, __last, __comp);
+ std::__merge_without_buffer(__first, __middle, __last,
+ __middle - __first,
+ __last - __middle,
+ __comp);
}
/**
- * @brief Determines whether an element exists in a range.
+ * @brief Sort the elements of a sequence, preserving the relative order
+ * of equivalent elements.
* @param first An iterator.
* @param last Another iterator.
- * @param val The search term.
- * @return True if @a val (or its equivelent) is in [@a first,@a last ].
- * @ingroup binarysearch
+ * @return Nothing.
*
- * Note that this does not actually return an iterator to @a val. For
- * that, use std::find or a container's specialized find member functions.
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p *(i+1)<*i is false for each iterator @p i in the range
+ * @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is preserved, so any two
+ * elements @p x and @p y in the range @p [first,last) such that
+ * @p x<y is false and @p y<x is false will have the same relative
+ * ordering after calling @p stable_sort().
*/
- template<typename _ForwardIterator, typename _Tp>
- bool
- binary_search(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val)
+ template<typename _RandomAccessIterator>
+ inline void
+ stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
// concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
- __glibcxx_requires_partitioned(__first, __last, __val);
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
- _ForwardIterator __i = std::lower_bound(__first, __last, __val);
- return __i != __last && !(__val < *__i);
+ _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__inplace_stable_sort(__first, __last);
+ else
+ std::__stable_sort_adaptive(__first, __last, __buf.begin(),
+ _DistanceType(__buf.size()));
}
/**
- * @brief Determines whether an element exists in a range.
+ * @brief Sort the elements of a sequence using a predicate for comparison,
+ * preserving the relative order of equivalent elements.
* @param first An iterator.
* @param last Another iterator.
- * @param val The search term.
- * @param comp A functor to use for comparisons.
- * @return True if @a val (or its equivelent) is in [@a first,@a last ].
- * @ingroup binarysearch
+ * @param comp A comparison functor.
+ * @return Nothing.
*
- * Note that this does not actually return an iterator to @a val. For
- * that, use std::find or a container's specialized find member functions.
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p comp(*(i+1),*i) is false for each iterator @p i in the
+ * range @p [first,last-1).
*
- * The comparison function should have the same effects on ordering as
- * the function used for the initial sort.
+ * The relative ordering of equivalent elements is preserved, so any two
+ * elements @p x and @p y in the range @p [first,last) such that
+ * @p comp(x,y) is false and @p comp(y,x) is false will have the same
+ * relative ordering after calling @p stable_sort().
*/
- template<typename _ForwardIterator, typename _Tp, typename _Compare>
- bool
- binary_search(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val, _Compare __comp)
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Compare __comp)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
// concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _Tp, _ValueType>)
- __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+ _ValueType,
+ _ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
- _ForwardIterator __i = std::lower_bound(__first, __last, __val, __comp);
- return __i != __last && !bool(__comp(__val, *__i));
+ _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__inplace_stable_sort(__first, __last, __comp);
+ else
+ std::__stable_sort_adaptive(__first, __last, __buf.begin(),
+ _DistanceType(__buf.size()), __comp);
}
// Set algorithms: includes, set_union, set_intersection, set_difference,
// min_element and max_element, with and without an explicitly supplied
// comparison function.
- /**
- * @brief Return the maximum element in a range.
- * @param first Start of range.
- * @param last End of range.
- * @return Iterator referencing the first instance of the largest value.
- */
- template<typename _ForwardIterator>
- _ForwardIterator
- max_element(_ForwardIterator __first, _ForwardIterator __last)
- {
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- if (__first == __last)
- return __first;
- _ForwardIterator __result = __first;
- while (++__first != __last)
- if (*__result < *__first)
- __result = __first;
- return __result;
- }
-
- /**
- * @brief Return the maximum element in a range using comparison functor.
- * @param first Start of range.
- * @param last End of range.
- * @param comp Comparison functor.
- * @return Iterator referencing the first instance of the largest value
- * according to comp.
- */
- template<typename _ForwardIterator, typename _Compare>
- _ForwardIterator
- max_element(_ForwardIterator __first, _ForwardIterator __last,
- _Compare __comp)
- {
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_ForwardIterator>::value_type,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- if (__first == __last) return __first;
- _ForwardIterator __result = __first;
- while (++__first != __last)
- if (__comp(*__result, *__first))
- __result = __first;
- return __result;
- }
-
/**
* @brief Return the minimum element in a range.
* @param first Start of range.
return __result;
}
- // next_permutation and prev_permutation, with and without an explicitly
- // supplied comparison function.
-
/**
- * @brief Permute range into the next "dictionary" ordering.
+ * @brief Return the maximum element in a range.
* @param first Start of range.
* @param last End of range.
- * @return False if wrapped to first permutation, true otherwise.
- *
- * Treats all permutations of the range as a set of "dictionary" sorted
- * sequences. Permutes the current sequence into the next one of this set.
- * Returns true if there are more sequences to generate. If the sequence
- * is the largest of the set, the smallest is generated and false returned.
+ * @return Iterator referencing the first instance of the largest value.
*/
- template<typename _BidirectionalIterator>
- bool
- next_permutation(_BidirectionalIterator __first,
- _BidirectionalIterator __last)
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ max_element(_ForwardIterator __first, _ForwardIterator __last)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<
- _BidirectionalIterator>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_BidirectionalIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- if (__first == __last)
- return false;
- _BidirectionalIterator __i = __first;
- ++__i;
- if (__i == __last)
- return false;
- __i = __last;
- --__i;
-
- for(;;)
- {
- _BidirectionalIterator __ii = __i;
- --__i;
- if (*__i < *__ii)
- {
- _BidirectionalIterator __j = __last;
- while (!(*__i < *--__j))
- {}
- std::iter_swap(__i, __j);
- std::reverse(__ii, __last);
- return true;
- }
- if (__i == __first)
- {
- std::reverse(__first, __last);
- return false;
- }
- }
- }
-
- /**
- * @brief Permute range into the next "dictionary" ordering using
- * comparison functor.
- * @param first Start of range.
- * @param last End of range.
- * @param comp
- * @return False if wrapped to first permutation, true otherwise.
- *
- * Treats all permutations of the range [first,last) as a set of
- * "dictionary" sorted sequences ordered by @a comp. Permutes the current
- * sequence into the next one of this set. Returns true if there are more
- * sequences to generate. If the sequence is the largest of the set, the
- * smallest is generated and false returned.
- */
- template<typename _BidirectionalIterator, typename _Compare>
- bool
- next_permutation(_BidirectionalIterator __first,
- _BidirectionalIterator __last, _Compare __comp)
- {
- // concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<
- _BidirectionalIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_BidirectionalIterator>::value_type,
- typename iterator_traits<_BidirectionalIterator>::value_type>)
+ typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
if (__first == __last)
- return false;
- _BidirectionalIterator __i = __first;
- ++__i;
- if (__i == __last)
- return false;
- __i = __last;
- --__i;
-
- for(;;)
- {
- _BidirectionalIterator __ii = __i;
- --__i;
- if (__comp(*__i, *__ii))
- {
- _BidirectionalIterator __j = __last;
- while (!bool(__comp(*__i, *--__j)))
- {}
- std::iter_swap(__i, __j);
- std::reverse(__ii, __last);
- return true;
- }
- if (__i == __first)
- {
- std::reverse(__first, __last);
- return false;
- }
- }
+ return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (*__result < *__first)
+ __result = __first;
+ return __result;
}
/**
- * @brief Permute range into the previous "dictionary" ordering.
+ * @brief Return the maximum element in a range using comparison functor.
* @param first Start of range.
* @param last End of range.
- * @return False if wrapped to last permutation, true otherwise.
- *
- * Treats all permutations of the range as a set of "dictionary" sorted
- * sequences. Permutes the current sequence into the previous one of this
- * set. Returns true if there are more sequences to generate. If the
- * sequence is the smallest of the set, the largest is generated and false
- * returned.
+ * @param comp Comparison functor.
+ * @return Iterator referencing the first instance of the largest value
+ * according to comp.
*/
- template<typename _BidirectionalIterator>
- bool
- prev_permutation(_BidirectionalIterator __first,
- _BidirectionalIterator __last)
+ template<typename _ForwardIterator, typename _Compare>
+ _ForwardIterator
+ max_element(_ForwardIterator __first, _ForwardIterator __last,
+ _Compare __comp)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<
- _BidirectionalIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- if (__first == __last)
- return false;
- _BidirectionalIterator __i = __first;
- ++__i;
- if (__i == __last)
- return false;
- __i = __last;
- --__i;
-
- for(;;)
- {
- _BidirectionalIterator __ii = __i;
- --__i;
- if (*__ii < *__i)
- {
- _BidirectionalIterator __j = __last;
- while (!(*--__j < *__i))
- {}
- std::iter_swap(__i, __j);
- std::reverse(__ii, __last);
- return true;
- }
- if (__i == __first)
- {
- std::reverse(__first, __last);
- return false;
- }
- }
+ if (__first == __last) return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (__comp(*__result, *__first))
+ __result = __first;
+ return __result;
}
+ // next_permutation and prev_permutation, with and without an explicitly
+ // supplied comparison function.
+
/**
- * @brief Permute range into the previous "dictionary" ordering using
- * comparison functor.
+ * @brief Permute range into the next "dictionary" ordering.
* @param first Start of range.
* @param last End of range.
- * @param comp
- * @return False if wrapped to last permutation, true otherwise.
+ * @return False if wrapped to first permutation, true otherwise.
*
- * Treats all permutations of the range [first,last) as a set of
- * "dictionary" sorted sequences ordered by @a comp. Permutes the current
- * sequence into the previous one of this set. Returns true if there are
- * more sequences to generate. If the sequence is the smallest of the set,
- * the largest is generated and false returned.
+ * Treats all permutations of the range as a set of "dictionary" sorted
+ * sequences. Permutes the current sequence into the next one of this set.
+ * Returns true if there are more sequences to generate. If the sequence
+ * is the largest of the set, the smallest is generated and false returned.
*/
- template<typename _BidirectionalIterator, typename _Compare>
+ template<typename _BidirectionalIterator>
bool
- prev_permutation(_BidirectionalIterator __first,
- _BidirectionalIterator __last, _Compare __comp)
+ next_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last)
{
// concept requirements
__glibcxx_function_requires(_BidirectionalIteratorConcept<
_BidirectionalIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_BidirectionalIterator>::value_type,
+ __glibcxx_function_requires(_LessThanComparableConcept<
typename iterator_traits<_BidirectionalIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
{
_BidirectionalIterator __ii = __i;
--__i;
- if (__comp(*__ii, *__i))
+ if (*__i < *__ii)
{
_BidirectionalIterator __j = __last;
- while (!bool(__comp(*--__j, *__i)))
- {}
- std::iter_swap(__i, __j);
- std::reverse(__ii, __last);
- return true;
- }
- if (__i == __first)
- {
- std::reverse(__first, __last);
- return false;
- }
- }
- }
-
- // find_first_of, with and without an explicitly supplied comparison function.
-
- /**
- * @brief Find element from a set in a sequence.
- * @param first1 Start of range to search.
- * @param last1 End of range to search.
- * @param first2 Start of match candidates.
- * @param last2 End of match candidates.
- * @return The first iterator @c i in the range
- * @p [first1,last1) such that @c *i == @p *(i2) such that i2 is an
- * interator in [first2,last2), or @p last1 if no such iterator exists.
- *
- * Searches the range @p [first1,last1) for an element that is equal to
- * some element in the range [first2,last2). If found, returns an iterator
- * in the range [first1,last1), otherwise returns @p last1.
- */
- template<typename _InputIterator, typename _ForwardIterator>
- _InputIterator
- find_first_of(_InputIterator __first1, _InputIterator __last1,
- _ForwardIterator __first2, _ForwardIterator __last2)
- {
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_InputIterator>::value_type,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first1, __last1);
- __glibcxx_requires_valid_range(__first2, __last2);
-
- for ( ; __first1 != __last1; ++__first1)
- for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter)
- if (*__first1 == *__iter)
- return __first1;
- return __last1;
- }
-
- /**
- * @brief Find element from a set in a sequence using a predicate.
- * @param first1 Start of range to search.
- * @param last1 End of range to search.
- * @param first2 Start of match candidates.
- * @param last2 End of match candidates.
- * @param comp Predicate to use.
- * @return The first iterator @c i in the range
- * @p [first1,last1) such that @c comp(*i, @p *(i2)) is true and i2 is an
- * interator in [first2,last2), or @p last1 if no such iterator exists.
- *
- * Searches the range @p [first1,last1) for an element that is equal to
- * some element in the range [first2,last2). If found, returns an iterator in
- * the range [first1,last1), otherwise returns @p last1.
- */
- template<typename _InputIterator, typename _ForwardIterator,
- typename _BinaryPredicate>
- _InputIterator
- find_first_of(_InputIterator __first1, _InputIterator __last1,
- _ForwardIterator __first2, _ForwardIterator __last2,
- _BinaryPredicate __comp)
- {
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
- typename iterator_traits<_InputIterator>::value_type,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first1, __last1);
- __glibcxx_requires_valid_range(__first2, __last2);
-
- for ( ; __first1 != __last1; ++__first1)
- for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter)
- if (__comp(*__first1, *__iter))
- return __first1;
- return __last1;
- }
-
-
- // find_end, with and without an explicitly supplied comparison function.
- // Search [first2, last2) as a subsequence in [first1, last1), and return
- // the *last* possible match. Note that find_end for bidirectional iterators
- // is much faster than for forward iterators.
-
- // find_end for forward iterators.
- template<typename _ForwardIterator1, typename _ForwardIterator2>
- _ForwardIterator1
- __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2,
- forward_iterator_tag, forward_iterator_tag)
- {
- if (__first2 == __last2)
- return __last1;
- else
- {
- _ForwardIterator1 __result = __last1;
- while (1)
- {
- _ForwardIterator1 __new_result
- = std::search(__first1, __last1, __first2, __last2);
- if (__new_result == __last1)
- return __result;
- else
- {
- __result = __new_result;
- __first1 = __new_result;
- ++__first1;
- }
- }
- }
- }
-
- template<typename _ForwardIterator1, typename _ForwardIterator2,
- typename _BinaryPredicate>
- _ForwardIterator1
- __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2,
- forward_iterator_tag, forward_iterator_tag,
- _BinaryPredicate __comp)
- {
- if (__first2 == __last2)
- return __last1;
- else
- {
- _ForwardIterator1 __result = __last1;
- while (1)
- {
- _ForwardIterator1 __new_result
- = std::search(__first1, __last1, __first2, __last2, __comp);
- if (__new_result == __last1)
- return __result;
- else
- {
- __result = __new_result;
- __first1 = __new_result;
- ++__first1;
- }
- }
- }
- }
-
- // find_end for bidirectional iterators. Requires partial specialization.
- template<typename _BidirectionalIterator1, typename _BidirectionalIterator2>
- _BidirectionalIterator1
- __find_end(_BidirectionalIterator1 __first1,
- _BidirectionalIterator1 __last1,
- _BidirectionalIterator2 __first2,
- _BidirectionalIterator2 __last2,
- bidirectional_iterator_tag, bidirectional_iterator_tag)
- {
- // concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<
- _BidirectionalIterator1>)
- __glibcxx_function_requires(_BidirectionalIteratorConcept<
- _BidirectionalIterator2>)
-
- typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
- typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
-
- _RevIterator1 __rlast1(__first1);
- _RevIterator2 __rlast2(__first2);
- _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
- _RevIterator2(__last2), __rlast2);
-
- if (__rresult == __rlast1)
- return __last1;
- else
- {
- _BidirectionalIterator1 __result = __rresult.base();
- std::advance(__result, -std::distance(__first2, __last2));
- return __result;
+ while (!(*__i < *--__j))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
}
}
- template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
- typename _BinaryPredicate>
- _BidirectionalIterator1
- __find_end(_BidirectionalIterator1 __first1,
- _BidirectionalIterator1 __last1,
- _BidirectionalIterator2 __first2,
- _BidirectionalIterator2 __last2,
- bidirectional_iterator_tag, bidirectional_iterator_tag,
- _BinaryPredicate __comp)
+ /**
+ * @brief Permute range into the next "dictionary" ordering using
+ * comparison functor.
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp
+ * @return False if wrapped to first permutation, true otherwise.
+ *
+ * Treats all permutations of the range [first,last) as a set of
+ * "dictionary" sorted sequences ordered by @a comp. Permutes the current
+ * sequence into the next one of this set. Returns true if there are more
+ * sequences to generate. If the sequence is the largest of the set, the
+ * smallest is generated and false returned.
+ */
+ template<typename _BidirectionalIterator, typename _Compare>
+ bool
+ next_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last, _Compare __comp)
{
// concept requirements
__glibcxx_function_requires(_BidirectionalIteratorConcept<
- _BidirectionalIterator1>)
- __glibcxx_function_requires(_BidirectionalIteratorConcept<
- _BidirectionalIterator2>)
-
- typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
- typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_BidirectionalIterator>::value_type,
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- _RevIterator1 __rlast1(__first1);
- _RevIterator2 __rlast2(__first2);
- _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
- _RevIterator2(__last2), __rlast2,
- __comp);
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
- if (__rresult == __rlast1)
- return __last1;
- else
+ for(;;)
{
- _BidirectionalIterator1 __result = __rresult.base();
- std::advance(__result, -std::distance(__first2, __last2));
- return __result;
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (__comp(*__i, *__ii))
+ {
+ _BidirectionalIterator __j = __last;
+ while (!bool(__comp(*__i, *--__j)))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
}
}
- // Dispatching functions for find_end.
-
/**
- * @brief Find last matching subsequence in a sequence.
- * @param first1 Start of range to search.
- * @param last1 End of range to search.
- * @param first2 Start of sequence to match.
- * @param last2 End of sequence to match.
- * @return The last iterator @c i in the range
- * @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N)
- * for each @c N in the range @p [0,last2-first2), or @p last1 if no
- * such iterator exists.
- *
- * Searches the range @p [first1,last1) for a sub-sequence that compares
- * equal value-by-value with the sequence given by @p [first2,last2) and
- * returns an iterator to the first element of the sub-sequence, or
- * @p last1 if the sub-sequence is not found. The sub-sequence will be the
- * last such subsequence contained in [first,last1).
+ * @brief Permute range into the previous "dictionary" ordering.
+ * @param first Start of range.
+ * @param last End of range.
+ * @return False if wrapped to last permutation, true otherwise.
*
- * Because the sub-sequence must lie completely within the range
- * @p [first1,last1) it must start at a position less than
- * @p last1-(last2-first2) where @p last2-first2 is the length of the
- * sub-sequence.
- * This means that the returned iterator @c i will be in the range
- * @p [first1,last1-(last2-first2))
+ * Treats all permutations of the range as a set of "dictionary" sorted
+ * sequences. Permutes the current sequence into the previous one of this
+ * set. Returns true if there are more sequences to generate. If the
+ * sequence is the smallest of the set, the largest is generated and false
+ * returned.
*/
- template<typename _ForwardIterator1, typename _ForwardIterator2>
- inline _ForwardIterator1
- find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2)
+ template<typename _BidirectionalIterator>
+ bool
+ prev_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last)
{
// concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_ForwardIterator1>::value_type,
- typename iterator_traits<_ForwardIterator2>::value_type>)
- __glibcxx_requires_valid_range(__first1, __last1);
- __glibcxx_requires_valid_range(__first2, __last2);
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- return std::__find_end(__first1, __last1, __first2, __last2,
- std::__iterator_category(__first1),
- std::__iterator_category(__first2));
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (*__ii < *__i)
+ {
+ _BidirectionalIterator __j = __last;
+ while (!(*--__j < *__i))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
+ }
}
/**
- * @brief Find last matching subsequence in a sequence using a predicate.
- * @param first1 Start of range to search.
- * @param last1 End of range to search.
- * @param first2 Start of sequence to match.
- * @param last2 End of sequence to match.
- * @param comp The predicate to use.
- * @return The last iterator @c i in the range
- * @p [first1,last1-(last2-first2)) such that @c predicate(*(i+N), @p
- * (first2+N)) is true for each @c N in the range @p [0,last2-first2), or
- * @p last1 if no such iterator exists.
- *
- * Searches the range @p [first1,last1) for a sub-sequence that compares
- * equal value-by-value with the sequence given by @p [first2,last2) using
- * comp as a predicate and returns an iterator to the first element of the
- * sub-sequence, or @p last1 if the sub-sequence is not found. The
- * sub-sequence will be the last such subsequence contained in
- * [first,last1).
+ * @brief Permute range into the previous "dictionary" ordering using
+ * comparison functor.
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp
+ * @return False if wrapped to last permutation, true otherwise.
*
- * Because the sub-sequence must lie completely within the range
- * @p [first1,last1) it must start at a position less than
- * @p last1-(last2-first2) where @p last2-first2 is the length of the
- * sub-sequence.
- * This means that the returned iterator @c i will be in the range
- * @p [first1,last1-(last2-first2))
+ * Treats all permutations of the range [first,last) as a set of
+ * "dictionary" sorted sequences ordered by @a comp. Permutes the current
+ * sequence into the previous one of this set. Returns true if there are
+ * more sequences to generate. If the sequence is the smallest of the set,
+ * the largest is generated and false returned.
*/
- template<typename _ForwardIterator1, typename _ForwardIterator2,
- typename _BinaryPredicate>
- inline _ForwardIterator1
- find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2,
- _BinaryPredicate __comp)
+ template<typename _BidirectionalIterator, typename _Compare>
+ bool
+ prev_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last, _Compare __comp)
{
// concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
- typename iterator_traits<_ForwardIterator1>::value_type,
- typename iterator_traits<_ForwardIterator2>::value_type>)
- __glibcxx_requires_valid_range(__first1, __last1);
- __glibcxx_requires_valid_range(__first2, __last2);
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_BidirectionalIterator>::value_type,
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- return std::__find_end(__first1, __last1, __first2, __last2,
- std::__iterator_category(__first1),
- std::__iterator_category(__first2),
- __comp);
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (__comp(*__ii, *__i))
+ {
+ _BidirectionalIterator __j = __last;
+ while (!bool(__comp(*--__j, *__i)))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
+ }
}
_GLIBCXX_END_NAMESPACE
projects / gcc.git / commitdiff