// Deque implementation -*- C++ -*-
-// Copyright (C) 2001-2014 Free Software Foundation, Inc.
+// Copyright (C) 2001-2015 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
#define _GLIBCXX_DEQUE_BUF_SIZE 512
#endif
- inline size_t
+ _GLIBCXX_CONSTEXPR inline size_t
__deque_buf_size(size_t __size)
{ return (__size < _GLIBCXX_DEQUE_BUF_SIZE
? size_t(_GLIBCXX_DEQUE_BUF_SIZE / __size) : size_t(1)); }
template<typename _Tp, typename _Ref, typename _Ptr>
struct _Deque_iterator
{
+#if __cplusplus < 201103L
typedef _Deque_iterator<_Tp, _Tp&, _Tp*> iterator;
typedef _Deque_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
+ typedef _Tp* _Elt_pointer;
+ typedef _Tp** _Map_pointer;
+#else
+ private:
+ template<typename _Up>
+ using __ptr_to = typename pointer_traits<_Ptr>::template rebind<_Up>;
+ template<typename _CvTp>
+ using __iter = _Deque_iterator<_Tp, _CvTp&, __ptr_to<_CvTp>>;
+ public:
+ typedef __iter<_Tp> iterator;
+ typedef __iter<const _Tp> const_iterator;
+ typedef __ptr_to<_Tp> _Elt_pointer;
+ typedef __ptr_to<_Elt_pointer> _Map_pointer;
+#endif
static size_t _S_buffer_size() _GLIBCXX_NOEXCEPT
{ return __deque_buf_size(sizeof(_Tp)); }
typedef _Ref reference;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
- typedef _Tp** _Map_pointer;
typedef _Deque_iterator _Self;
- _Tp* _M_cur;
- _Tp* _M_first;
- _Tp* _M_last;
+ _Elt_pointer _M_cur;
+ _Elt_pointer _M_first;
+ _Elt_pointer _M_last;
_Map_pointer _M_node;
- _Deque_iterator(_Tp* __x, _Map_pointer __y) _GLIBCXX_NOEXCEPT
+ _Deque_iterator(_Elt_pointer __x, _Map_pointer __y) _GLIBCXX_NOEXCEPT
: _M_cur(__x), _M_first(*__y),
_M_last(*__y + _S_buffer_size()), _M_node(__y) { }
_Deque_iterator() _GLIBCXX_NOEXCEPT
- : _M_cur(0), _M_first(0), _M_last(0), _M_node(0) { }
+ : _M_cur(), _M_first(), _M_last(), _M_node() { }
_Deque_iterator(const iterator& __x) _GLIBCXX_NOEXCEPT
: _M_cur(__x._M_cur), _M_first(__x._M_first),
template<typename _Tp, typename _Alloc>
class _Deque_base
{
+ protected:
+ typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
+ rebind<_Tp>::other _Tp_alloc_type;
+ typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Alloc_traits;
+
+#if __cplusplus < 201103L
+ typedef _Tp* _Ptr;
+ typedef const _Tp* _Ptr_const;
+#else
+ typedef typename _Alloc_traits::pointer _Ptr;
+ typedef typename _Alloc_traits::const_pointer _Ptr_const;
+#endif
+
+ typedef typename _Alloc_traits::template rebind<_Ptr>::other
+ _Map_alloc_type;
+ typedef __gnu_cxx::__alloc_traits<_Map_alloc_type> _Map_alloc_traits;
+
public:
typedef _Alloc allocator_type;
+ typedef typename _Alloc_traits::size_type size_type;
allocator_type
get_allocator() const _GLIBCXX_NOEXCEPT
{ return allocator_type(_M_get_Tp_allocator()); }
- typedef _Deque_iterator<_Tp, _Tp&, _Tp*> iterator;
- typedef _Deque_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
+ typedef _Deque_iterator<_Tp, _Tp&, _Ptr> iterator;
+ typedef _Deque_iterator<_Tp, const _Tp&, _Ptr_const> const_iterator;
_Deque_base()
: _M_impl()
_Deque_base(const allocator_type& __a)
: _M_impl(__a)
- { _M_initialize_map(0); }
+ { /* Caller must initialize map. */ }
#if __cplusplus >= 201103L
- _Deque_base(_Deque_base&& __x)
+ _Deque_base(_Deque_base&& __x, false_type)
+ : _M_impl(__x._M_move_impl())
+ { }
+
+ _Deque_base(_Deque_base&& __x, true_type)
: _M_impl(std::move(__x._M_get_Tp_allocator()))
{
_M_initialize_map(0);
if (__x._M_impl._M_map)
+ this->_M_impl._M_swap_data(__x._M_impl);
+ }
+
+ _Deque_base(_Deque_base&& __x)
+ : _Deque_base(std::move(__x),
+ __gnu_cxx::__allocator_always_compares_equal<_Alloc>{})
+ { }
+
+ _Deque_base(_Deque_base&& __x, const allocator_type& __a, size_type __n)
+ : _M_impl(__a)
+ {
+ if (__x.get_allocator() == __a)
+ {
+ if (__x._M_impl._M_map)
+ {
+ _M_initialize_map(0);
+ this->_M_impl._M_swap_data(__x._M_impl);
+ }
+ }
+ else
{
- std::swap(this->_M_impl._M_start, __x._M_impl._M_start);
- std::swap(this->_M_impl._M_finish, __x._M_impl._M_finish);
- std::swap(this->_M_impl._M_map, __x._M_impl._M_map);
- std::swap(this->_M_impl._M_map_size, __x._M_impl._M_map_size);
+ _M_initialize_map(__n);
}
}
#endif
~_Deque_base() _GLIBCXX_NOEXCEPT;
protected:
- typedef typename _Alloc::template rebind<_Tp*>::other _Map_alloc_type;
-
- typedef typename _Alloc::template rebind<_Tp>::other _Tp_alloc_type;
+ typedef typename iterator::_Map_pointer _Map_pointer;
//This struct encapsulates the implementation of the std::deque
//standard container and at the same time makes use of the EBO
struct _Deque_impl
: public _Tp_alloc_type
{
- _Tp** _M_map;
+ _Map_pointer _M_map;
size_t _M_map_size;
iterator _M_start;
iterator _M_finish;
_Deque_impl()
- : _Tp_alloc_type(), _M_map(0), _M_map_size(0),
+ : _Tp_alloc_type(), _M_map(), _M_map_size(0),
_M_start(), _M_finish()
{ }
_Deque_impl(const _Tp_alloc_type& __a) _GLIBCXX_NOEXCEPT
- : _Tp_alloc_type(__a), _M_map(0), _M_map_size(0),
+ : _Tp_alloc_type(__a), _M_map(), _M_map_size(0),
_M_start(), _M_finish()
{ }
#if __cplusplus >= 201103L
- _Deque_impl(_Tp_alloc_type&& __a) _GLIBCXX_NOEXCEPT
- : _Tp_alloc_type(std::move(__a)), _M_map(0), _M_map_size(0),
+ _Deque_impl(_Deque_impl&&) = default;
+
+ _Deque_impl(_Tp_alloc_type&& __a) noexcept
+ : _Tp_alloc_type(std::move(__a)), _M_map(), _M_map_size(0),
_M_start(), _M_finish()
{ }
#endif
+
+ void _M_swap_data(_Deque_impl& __x) _GLIBCXX_NOEXCEPT
+ {
+ using std::swap;
+ swap(this->_M_start, __x._M_start);
+ swap(this->_M_finish, __x._M_finish);
+ swap(this->_M_map, __x._M_map);
+ swap(this->_M_map_size, __x._M_map_size);
+ }
};
_Tp_alloc_type&
_M_get_map_allocator() const _GLIBCXX_NOEXCEPT
{ return _Map_alloc_type(_M_get_Tp_allocator()); }
- _Tp*
+ _Ptr
_M_allocate_node()
{
- return _M_impl._Tp_alloc_type::allocate(__deque_buf_size(sizeof(_Tp)));
+ typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Traits;
+ return _Traits::allocate(_M_impl, __deque_buf_size(sizeof(_Tp)));
}
void
- _M_deallocate_node(_Tp* __p) _GLIBCXX_NOEXCEPT
+ _M_deallocate_node(_Ptr __p) _GLIBCXX_NOEXCEPT
{
- _M_impl._Tp_alloc_type::deallocate(__p, __deque_buf_size(sizeof(_Tp)));
+ typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Traits;
+ _Traits::deallocate(_M_impl, __p, __deque_buf_size(sizeof(_Tp)));
}
- _Tp**
+ _Map_pointer
_M_allocate_map(size_t __n)
- { return _M_get_map_allocator().allocate(__n); }
+ {
+ _Map_alloc_type __map_alloc = _M_get_map_allocator();
+ return _Map_alloc_traits::allocate(__map_alloc, __n);
+ }
void
- _M_deallocate_map(_Tp** __p, size_t __n) _GLIBCXX_NOEXCEPT
- { _M_get_map_allocator().deallocate(__p, __n); }
+ _M_deallocate_map(_Map_pointer __p, size_t __n) _GLIBCXX_NOEXCEPT
+ {
+ _Map_alloc_type __map_alloc = _M_get_map_allocator();
+ _Map_alloc_traits::deallocate(__map_alloc, __p, __n);
+ }
protected:
void _M_initialize_map(size_t);
- void _M_create_nodes(_Tp** __nstart, _Tp** __nfinish);
- void _M_destroy_nodes(_Tp** __nstart, _Tp** __nfinish) _GLIBCXX_NOEXCEPT;
+ void _M_create_nodes(_Map_pointer __nstart, _Map_pointer __nfinish);
+ void _M_destroy_nodes(_Map_pointer __nstart,
+ _Map_pointer __nfinish) _GLIBCXX_NOEXCEPT;
enum { _S_initial_map_size = 8 };
_Deque_impl _M_impl;
+
+#if __cplusplus >= 201103L
+ private:
+ _Deque_impl
+ _M_move_impl()
+ {
+ if (!_M_impl._M_map)
+ return std::move(_M_impl);
+
+ // Create a copy of the current allocator.
+ _Tp_alloc_type __alloc{_M_get_Tp_allocator()};
+ // Put that copy in a moved-from state.
+ _Tp_alloc_type __sink __attribute((__unused__)) {std::move(__alloc)};
+ // Create an empty map that allocates using the moved-from allocator.
+ _Deque_base __empty{__alloc};
+ // Now safe to modify current allocator and perform non-throwing swaps.
+ _Deque_impl __ret{std::move(_M_get_Tp_allocator())};
+ _M_impl._M_swap_data(__ret);
+ _M_impl._M_swap_data(__empty._M_impl);
+ return __ret;
+ }
+#endif
};
template<typename _Tp, typename _Alloc>
/**
* @brief Layout storage.
* @param __num_elements The count of T's for which to allocate space
- * at first.
+ * at first.
* @return Nothing.
*
* The initial underlying memory layout is a bit complicated...
// the beginning of _M_map, but for small maps it may be as far in as
// _M_map+3.
- _Tp** __nstart = (this->_M_impl._M_map
- + (this->_M_impl._M_map_size - __num_nodes) / 2);
- _Tp** __nfinish = __nstart + __num_nodes;
+ _Map_pointer __nstart = (this->_M_impl._M_map
+ + (this->_M_impl._M_map_size - __num_nodes) / 2);
+ _Map_pointer __nfinish = __nstart + __num_nodes;
__try
{ _M_create_nodes(__nstart, __nfinish); }
__catch(...)
{
_M_deallocate_map(this->_M_impl._M_map, this->_M_impl._M_map_size);
- this->_M_impl._M_map = 0;
+ this->_M_impl._M_map = _Map_pointer();
this->_M_impl._M_map_size = 0;
__throw_exception_again;
}
template<typename _Tp, typename _Alloc>
void
_Deque_base<_Tp, _Alloc>::
- _M_create_nodes(_Tp** __nstart, _Tp** __nfinish)
+ _M_create_nodes(_Map_pointer __nstart, _Map_pointer __nfinish)
{
- _Tp** __cur;
+ _Map_pointer __cur;
__try
{
for (__cur = __nstart; __cur < __nfinish; ++__cur)
template<typename _Tp, typename _Alloc>
void
_Deque_base<_Tp, _Alloc>::
- _M_destroy_nodes(_Tp** __nstart, _Tp** __nfinish) _GLIBCXX_NOEXCEPT
+ _M_destroy_nodes(_Map_pointer __nstart,
+ _Map_pointer __nfinish) _GLIBCXX_NOEXCEPT
{
- for (_Tp** __n = __nstart; __n < __nfinish; ++__n)
+ for (_Map_pointer __n = __nstart; __n < __nfinish; ++__n)
_M_deallocate_node(*__n);
}
__glibcxx_class_requires(_Tp, _SGIAssignableConcept)
__glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept)
- typedef _Deque_base<_Tp, _Alloc> _Base;
- typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
+ typedef _Deque_base<_Tp, _Alloc> _Base;
+ typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
+ typedef typename _Base::_Alloc_traits _Alloc_traits;
+ typedef typename _Base::_Map_pointer _Map_pointer;
public:
typedef _Tp value_type;
- typedef typename _Tp_alloc_type::pointer pointer;
- typedef typename _Tp_alloc_type::const_pointer const_pointer;
- typedef typename _Tp_alloc_type::reference reference;
- typedef typename _Tp_alloc_type::const_reference const_reference;
+ typedef typename _Alloc_traits::pointer pointer;
+ typedef typename _Alloc_traits::const_pointer const_pointer;
+ typedef typename _Alloc_traits::reference reference;
+ typedef typename _Alloc_traits::const_reference const_reference;
typedef typename _Base::iterator iterator;
typedef typename _Base::const_iterator const_iterator;
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
typedef _Alloc allocator_type;
protected:
- typedef pointer* _Map_pointer;
-
static size_t _S_buffer_size() _GLIBCXX_NOEXCEPT
{ return __deque_buf_size(sizeof(_Tp)); }
public:
// [23.2.1.1] construct/copy/destroy
// (assign() and get_allocator() are also listed in this section)
+
+ /**
+ * @brief Creates a %deque with no elements.
+ */
+ deque() : _Base() { }
+
/**
* @brief Creates a %deque with no elements.
* @param __a An allocator object.
*/
explicit
- deque(const allocator_type& __a = allocator_type())
- : _Base(__a) { }
+ deque(const allocator_type& __a)
+ : _Base(__a, 0) { }
#if __cplusplus >= 201103L
/**
* constructed elements.
*/
explicit
- deque(size_type __n)
- : _Base(__n)
+ deque(size_type __n, const allocator_type& __a = allocator_type())
+ : _Base(__a, __n)
{ _M_default_initialize(); }
/**
* by @a __x.
*/
deque(const deque& __x)
- : _Base(__x._M_get_Tp_allocator(), __x.size())
+ : _Base(_Alloc_traits::_S_select_on_copy(__x._M_get_Tp_allocator()),
+ __x.size())
{ std::__uninitialized_copy_a(__x.begin(), __x.end(),
this->_M_impl._M_start,
_M_get_Tp_allocator()); }
deque(deque&& __x)
: _Base(std::move(__x)) { }
+ /// Copy constructor with alternative allocator
+ deque(const deque& __x, const allocator_type& __a)
+ : _Base(__a, __x.size())
+ { std::__uninitialized_copy_a(__x.begin(), __x.end(),
+ this->_M_impl._M_start,
+ _M_get_Tp_allocator()); }
+
+ /// Move constructor with alternative allocator
+ deque(deque&& __x, const allocator_type& __a)
+ : _Base(std::move(__x), __a, __x.size())
+ {
+ if (__x.get_allocator() != __a)
+ {
+ std::__uninitialized_move_a(__x.begin(), __x.end(),
+ this->_M_impl._M_start,
+ _M_get_Tp_allocator());
+ __x.clear();
+ }
+ }
+
/**
* @brief Builds a %deque from an initializer list.
* @param __l An initializer_list.
* themselves are pointers, the pointed-to memory is not touched in any
* way. Managing the pointer is the user's responsibility.
*/
- ~deque() _GLIBCXX_NOEXCEPT
+ ~deque()
{ _M_destroy_data(begin(), end(), _M_get_Tp_allocator()); }
/**
* @brief %Deque move assignment operator.
* @param __x A %deque of identical element and allocator types.
*
- * The contents of @a __x are moved into this deque (without copying).
+ * The contents of @a __x are moved into this deque (without copying,
+ * if the allocators permit it).
* @a __x is a valid, but unspecified %deque.
*/
deque&
- operator=(deque&& __x) noexcept
+ operator=(deque&& __x) noexcept(_Alloc_traits::_S_always_equal())
{
- // NB: DR 1204.
- // NB: DR 675.
- this->clear();
- this->swap(__x);
+ constexpr bool __always_equal = _Alloc_traits::_S_always_equal();
+ _M_move_assign1(std::move(__x),
+ integral_constant<bool, __always_equal>());
return *this;
}
/** Returns the size() of the largest possible %deque. */
size_type
max_size() const _GLIBCXX_NOEXCEPT
- { return _M_get_Tp_allocator().max_size(); }
+ { return _Alloc_traits::max_size(_M_get_Tp_allocator()); }
#if __cplusplus >= 201103L
/**
{
if (this->_M_impl._M_start._M_cur != this->_M_impl._M_start._M_first)
{
- this->_M_impl.construct(this->_M_impl._M_start._M_cur - 1, __x);
+ _Alloc_traits::construct(this->_M_impl,
+ this->_M_impl._M_start._M_cur - 1,
+ __x);
--this->_M_impl._M_start._M_cur;
}
else
if (this->_M_impl._M_finish._M_cur
!= this->_M_impl._M_finish._M_last - 1)
{
- this->_M_impl.construct(this->_M_impl._M_finish._M_cur, __x);
+ _Alloc_traits::construct(this->_M_impl,
+ this->_M_impl._M_finish._M_cur, __x);
++this->_M_impl._M_finish._M_cur;
}
else
if (this->_M_impl._M_start._M_cur
!= this->_M_impl._M_start._M_last - 1)
{
- this->_M_impl.destroy(this->_M_impl._M_start._M_cur);
+ _Alloc_traits::destroy(this->_M_impl,
+ this->_M_impl._M_start._M_cur);
++this->_M_impl._M_start._M_cur;
}
else
!= this->_M_impl._M_finish._M_first)
{
--this->_M_impl._M_finish._M_cur;
- this->_M_impl.destroy(this->_M_impl._M_finish._M_cur);
+ _Alloc_traits::destroy(this->_M_impl,
+ this->_M_impl._M_finish._M_cur);
}
else
_M_pop_back_aux();
* std::swap(d1,d2) will feed to this function.
*/
void
- swap(deque& __x) _GLIBCXX_NOEXCEPT
+ swap(deque& __x)
+#if __cplusplus >= 201103L
+ noexcept(_Alloc_traits::_S_nothrow_swap())
+#endif
{
- std::swap(this->_M_impl._M_start, __x._M_impl._M_start);
- std::swap(this->_M_impl._M_finish, __x._M_impl._M_finish);
- std::swap(this->_M_impl._M_map, __x._M_impl._M_map);
- std::swap(this->_M_impl._M_map_size, __x._M_impl._M_map_size);
-
- // _GLIBCXX_RESOLVE_LIB_DEFECTS
- // 431. Swapping containers with unequal allocators.
- std::__alloc_swap<_Tp_alloc_type>::_S_do_it(_M_get_Tp_allocator(),
- __x._M_get_Tp_allocator());
+ _M_impl._M_swap_data(__x._M_impl);
+ _Alloc_traits::_S_on_swap(_M_get_Tp_allocator(),
+ __x._M_get_Tp_allocator());
}
/**
void
_M_reallocate_map(size_type __nodes_to_add, bool __add_at_front);
//@}
+
+#if __cplusplus >= 201103L
+ // Constant-time, nothrow move assignment when source object's memory
+ // can be moved because the allocators are equal.
+ void
+ _M_move_assign1(deque&& __x, /* always equal: */ true_type) noexcept
+ {
+ this->_M_impl._M_swap_data(__x._M_impl);
+ __x.clear();
+ std::__alloc_on_move(_M_get_Tp_allocator(), __x._M_get_Tp_allocator());
+ }
+
+ void
+ _M_move_assign1(deque&& __x, /* always equal: */ false_type)
+ {
+ constexpr bool __move_storage =
+ _Alloc_traits::_S_propagate_on_move_assign();
+ _M_move_assign2(std::move(__x),
+ integral_constant<bool, __move_storage>());
+ }
+
+ // Destroy all elements and deallocate all memory, then replace
+ // with elements created from __args.
+ template<typename... _Args>
+ void
+ _M_replace_map(_Args&&... __args)
+ {
+ // Create new data first, so if allocation fails there are no effects.
+ deque __newobj(std::forward<_Args>(__args)...);
+ // Free existing storage using existing allocator.
+ clear();
+ _M_deallocate_node(*begin()._M_node); // one node left after clear()
+ _M_deallocate_map(this->_M_impl._M_map, this->_M_impl._M_map_size);
+ this->_M_impl._M_map = nullptr;
+ this->_M_impl._M_map_size = 0;
+ // Take ownership of replacement memory.
+ this->_M_impl._M_swap_data(__newobj._M_impl);
+ }
+
+ // Do move assignment when the allocator propagates.
+ void
+ _M_move_assign2(deque&& __x, /* propagate: */ true_type)
+ {
+ // Make a copy of the original allocator state.
+ auto __alloc = __x._M_get_Tp_allocator();
+ // The allocator propagates so storage can be moved from __x,
+ // leaving __x in a valid empty state with a moved-from allocator.
+ _M_replace_map(std::move(__x));
+ // Move the corresponding allocator state too.
+ _M_get_Tp_allocator() = std::move(__alloc);
+ }
+
+ // Do move assignment when it may not be possible to move source
+ // object's memory, resulting in a linear-time operation.
+ void
+ _M_move_assign2(deque&& __x, /* propagate: */ false_type)
+ {
+ if (__x._M_get_Tp_allocator() == this->_M_get_Tp_allocator())
+ {
+ // The allocators are equal so storage can be moved from __x,
+ // leaving __x in a valid empty state with its current allocator.
+ _M_replace_map(std::move(__x), __x.get_allocator());
+ }
+ else
+ {
+ // The rvalue's allocator cannot be moved and is not equal,
+ // so we need to individually move each element.
+ this->assign(std::__make_move_if_noexcept_iterator(__x.begin()),
+ std::__make_move_if_noexcept_iterator(__x.end()));
+ __x.clear();
+ }
+ }
+#endif
};
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