// namespace std::tr1
namespace std
{
+
_GLIBCXX_BEGIN_NAMESPACE(tr1)
+// TODO This should go into a separate header really.
+enum _Lock_policy { _S_lockfree, _S_mutex, _S_single };
+
+static const _Lock_policy __shared_ptr_default_lock_mode =
+#ifdef __GTHREADS
+// NOTE: This doesn't actually exist yet in the compiler.
+#ifdef _GLIBCXX_ATOMIC_BUILTINS
+ _S_lockfree;
+#else
+ _S_mutex;
+#endif
+#else
+ _S_single;
+#endif
+
+// END TODO
+
class bad_weak_ptr : public std::exception
{
{ delete p; }
};
+// Empty helper class except when the template argument is _S_mutex.
+template <_Lock_policy __l>
+ class _Mutex_base
+ {
+ };
-class _Sp_counted_base
-{
-public:
-
- _Sp_counted_base()
- : _M_use_count(1), _M_weak_count(1)
+template <>
+ class _Mutex_base<_S_mutex>
{
- // For the case of __GTHREAD_MUTEX_INIT we haven't initialised
- // the mutex yet, so do it now.
+ public:
+ __gnu_cxx::mutex_type _M_mutex;
+
+ _Mutex_base()
+ {
+ // For the case of __GTHREAD_MUTEX_INIT we haven't initialised
+ // the mutex yet, so do it now.
#if defined(__GTHREADS) && defined(__GTHREAD_MUTEX_INIT)
- __gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
- _M_mutex = __tmp;
+ __gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
+ _M_mutex = __tmp;
#endif
- }
-
- virtual
- ~_Sp_counted_base() // nothrow
- { }
-
- // dispose() is called when _M_use_count drops to zero, to release
- // the resources managed by *this.
- virtual void
- dispose() = 0; // nothrow
-
- // destroy() is called when _M_weak_count drops to zero.
- virtual void
- destroy() // nothrow
- {
- delete this;
- }
+ }
+ };
- virtual void*
- get_deleter(const std::type_info&) = 0;
- void
- add_ref_copy()
+template <_Lock_policy __l = __shared_ptr_default_lock_mode>
+ class _Sp_counted_base
+ : public _Mutex_base<__l>
{
- __gnu_cxx::__atomic_add_dispatch(&_M_use_count, 1);
- }
+ public:
+
+ _Sp_counted_base()
+ : _M_use_count(1), _M_weak_count(1)
+ {
+ }
+
+ virtual
+ ~_Sp_counted_base() // nothrow
+ { }
+
+ // dispose() is called when _M_use_count drops to zero, to release
+ // the resources managed by *this.
+ virtual void
+ dispose() = 0; // nothrow
+
+ // destroy() is called when _M_weak_count drops to zero.
+ virtual void
+ destroy() // nothrow
+ {
+ delete this;
+ }
+
+ virtual void*
+ get_deleter(const std::type_info&) = 0;
+
+ void
+ add_ref_copy()
+ {
+ __gnu_cxx::__atomic_add(&_M_use_count, 1);
+ }
+
+ void
+ add_ref_lock();
+
+ void
+ release() // nothrow
+ {
+ if (__gnu_cxx::__exchange_and_add(&_M_use_count, -1) == 1)
+ {
+ dispose();
+ #ifdef __GTHREADS
+ _GLIBCXX_READ_MEM_BARRIER;
+ _GLIBCXX_WRITE_MEM_BARRIER;
+ #endif
+ if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
+ destroy();
+ }
+ }
+
+ void
+ weak_add_ref() // nothrow
+ {
+ __gnu_cxx::__atomic_add(&_M_weak_count, 1);
+ }
+
+ void
+ weak_release() // nothrow
+ {
+ if (__gnu_cxx::__exchange_and_add(&_M_weak_count, -1) == 1)
+ {
+#ifdef __GTHREADS
+ _GLIBCXX_READ_MEM_BARRIER;
+ _GLIBCXX_WRITE_MEM_BARRIER;
+#endif
+ destroy();
+ }
+ }
+
+ long
+ use_count() const // nothrow
+ {
+ return _M_use_count; // XXX is this MT safe?
+ }
+
+ private:
+
+ _Sp_counted_base(_Sp_counted_base const&);
+ _Sp_counted_base& operator=(_Sp_counted_base const&);
+
+ _Atomic_word _M_use_count; // #shared
+ _Atomic_word _M_weak_count; // #weak + (#shared != 0)
+ };
+template<>
+ inline
void
- add_ref_lock()
+ _Sp_counted_base<_S_single>::add_ref_lock()
{
- __gnu_cxx::lock lock(_M_mutex);
- if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, 1) == 0)
+ if (__gnu_cxx::__exchange_and_add(&_M_use_count, 1) == 0)
{
- _M_use_count = 0;
- __throw_bad_weak_ptr();
+ _M_use_count = 0;
+ __throw_bad_weak_ptr();
}
}
-
+
+#ifdef __GTHREADS
+template<>
+ inline
void
- release() // nothrow
+ _Sp_counted_base<_S_mutex>::add_ref_lock()
{
- if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, -1) == 1)
+ __gnu_cxx::lock lock(_M_mutex);
+ if (__gnu_cxx::__exchange_and_add(&_M_use_count, 1) == 0)
{
- dispose();
-#ifdef __GTHREADS
- _GLIBCXX_READ_MEM_BARRIER;
- _GLIBCXX_WRITE_MEM_BARRIER;
-#endif
- if (__gnu_cxx::__exchange_and_add_dispatch(&_M_weak_count, -1) == 1)
- destroy();
+ _M_use_count = 0;
+ __throw_bad_weak_ptr();
}
}
-
- void
- weak_add_ref() // nothrow
- {
- __gnu_cxx::__atomic_add_dispatch(&_M_weak_count, 1);
- }
-
- void
- weak_release() // nothrow
- {
- if (__gnu_cxx::__exchange_and_add_dispatch(&_M_weak_count, -1) == 1)
- {
-#ifdef __GTHREADS
- _GLIBCXX_READ_MEM_BARRIER;
- _GLIBCXX_WRITE_MEM_BARRIER;
#endif
- destroy();
- }
- }
- long
- use_count() const // nothrow
+template<>
+ inline
+ void
+ _Sp_counted_base<_S_lockfree>::add_ref_lock()
{
- return _M_use_count; // XXX is this MT safe?
+ // Perform lock-free add-if-not-zero operation.
+ _Atomic_word __count;
+ do
+ {
+ __count = _M_use_count;
+ if (__count == 0)
+ {
+ __throw_bad_weak_ptr();
+ }
+ /* Replace the current counter value with the old value + 1, as long
+ * as it's not changed meanwhile. */
+ }
+ while (!__sync_bool_compare_and_swap(&_M_use_count, __count, __count + 1));
}
-private:
-
- _Sp_counted_base(_Sp_counted_base const&);
- _Sp_counted_base& operator=(_Sp_counted_base const&);
-
- _Atomic_word _M_use_count; // #shared
- _Atomic_word _M_weak_count; // #weak + (#shared != 0)
- __gnu_cxx::mutex_type _M_mutex;
-};
-
-template<typename _Ptr, typename _Deleter>
+template<typename _Ptr, typename _Deleter, _Lock_policy __l>
class _Sp_counted_base_impl
- : public _Sp_counted_base
+ : public _Sp_counted_base<__l>
{
public:
_Deleter _M_del; // copy constructor must not throw
};
-class weak_count;
-
-class shared_count
-{
-private:
-
- _Sp_counted_base* _M_pi;
-
- friend class weak_count;
-
-public:
-
- shared_count()
- : _M_pi(0) // nothrow
- { }
-
- template<typename _Ptr, typename _Deleter>
- shared_count(_Ptr __p, _Deleter __d)
- : _M_pi(0)
- {
- try
- {
- _M_pi = new _Sp_counted_base_impl<_Ptr, _Deleter>(__p, __d);
- }
- catch(...)
- {
- __d(__p); // delete __p
- __throw_exception_again;
- }
- }
-
- // auto_ptr<_Tp> is special cased to provide the strong guarantee
-
- template<typename _Tp>
- explicit shared_count(std::auto_ptr<_Tp>& __r)
- : _M_pi(new _Sp_counted_base_impl<_Tp*,
- _Sp_deleter<_Tp> >(__r.get(), _Sp_deleter<_Tp>()))
- { __r.release(); }
-
- // throws bad_weak_ptr when __r.use_count() == 0
- explicit shared_count(const weak_count& __r);
-
- ~shared_count() // nothrow
- {
- if (_M_pi != 0)
- _M_pi->release();
- }
+template<_Lock_policy __l = __shared_ptr_default_lock_mode>
+ class weak_count;
- shared_count(const shared_count& __r)
- : _M_pi(__r._M_pi) // nothrow
+template<_Lock_policy __l = __shared_ptr_default_lock_mode>
+ class shared_count
{
- if (_M_pi != 0)
- _M_pi->add_ref_copy();
- }
-
- shared_count&
- operator=(const shared_count& __r) // nothrow
- {
- _Sp_counted_base* __tmp = __r._M_pi;
-
- if(__tmp != _M_pi)
+ private:
+
+ _Sp_counted_base<__l>* _M_pi;
+
+ friend class weak_count<__l>;
+
+ public:
+
+ shared_count()
+ : _M_pi(0) // nothrow
+ { }
+
+ template<typename _Ptr, typename _Deleter>
+ shared_count(_Ptr __p, _Deleter __d)
+ : _M_pi(0)
{
- if(__tmp != 0)
- __tmp->add_ref_copy();
- if(_M_pi != 0)
- _M_pi->release();
- _M_pi = __tmp;
+ try
+ {
+ _M_pi = new _Sp_counted_base_impl<_Ptr, _Deleter, __l>(__p, __d);
+ }
+ catch(...)
+ {
+ __d(__p); // delete __p
+ __throw_exception_again;
+ }
}
- return *this;
- }
-
- void swap(shared_count& __r) // nothrow
- {
- _Sp_counted_base* __tmp = __r._M_pi;
- __r._M_pi = _M_pi;
- _M_pi = __tmp;
- }
-
- long
- use_count() const // nothrow
- { return _M_pi != 0 ? _M_pi->use_count() : 0; }
-
- bool
- unique() const // nothrow
- { return this->use_count() == 1; }
-
- friend inline bool
- operator==(const shared_count& __a, const shared_count& __b)
- { return __a._M_pi == __b._M_pi; }
-
- friend inline bool
- operator<(const shared_count& __a, const shared_count& __b)
- { return std::less<_Sp_counted_base*>()(__a._M_pi, __b._M_pi); }
-
- void*
- get_deleter(const std::type_info& __ti) const
- { return _M_pi ? _M_pi->get_deleter(__ti) : 0; }
-};
-
-class weak_count
-{
-private:
-
- _Sp_counted_base* _M_pi;
-
- friend class shared_count;
-
-public:
-
- weak_count()
- : _M_pi(0) // nothrow
- { }
-
- weak_count(const shared_count& __r)
- : _M_pi(__r._M_pi) // nothrow
- {
- if (_M_pi != 0)
- _M_pi->weak_add_ref();
- }
-
- weak_count(const weak_count& __r)
- : _M_pi(__r._M_pi) // nothrow
- {
- if (_M_pi != 0)
- _M_pi->weak_add_ref();
- }
-
- ~weak_count() // nothrow
- {
- if (_M_pi != 0)
- _M_pi->weak_release();
- }
+
+ // auto_ptr<_Tp> is special cased to provide the strong guarantee
+
+ template<typename _Tp>
+ explicit shared_count(std::auto_ptr<_Tp>& __r)
+ : _M_pi(new _Sp_counted_base_impl<_Tp*,
+ _Sp_deleter<_Tp>, __l >(__r.get(), _Sp_deleter<_Tp>()))
+ { __r.release(); }
+
+ // throws bad_weak_ptr when __r.use_count() == 0
+ explicit shared_count(const weak_count<__l>& __r);
+
+ ~shared_count() // nothrow
+ {
+ if (_M_pi != 0)
+ _M_pi->release();
+ }
+
+ shared_count(const shared_count& __r)
+ : _M_pi(__r._M_pi) // nothrow
+ {
+ if (_M_pi != 0)
+ _M_pi->add_ref_copy();
+ }
+
+ shared_count&
+ operator=(const shared_count& __r) // nothrow
+ {
+ _Sp_counted_base<__l>* __tmp = __r._M_pi;
+
+ if(__tmp != _M_pi)
+ {
+ if(__tmp != 0)
+ __tmp->add_ref_copy();
+ if(_M_pi != 0)
+ _M_pi->release();
+ _M_pi = __tmp;
+ }
+ return *this;
+ }
+
+ void swap(shared_count& __r) // nothrow
+ {
+ _Sp_counted_base<__l>* __tmp = __r._M_pi;
+ __r._M_pi = _M_pi;
+ _M_pi = __tmp;
+ }
+
+ long
+ use_count() const // nothrow
+ { return _M_pi != 0 ? _M_pi->use_count() : 0; }
+
+ bool
+ unique() const // nothrow
+ { return this->use_count() == 1; }
+
+ friend inline bool
+ operator==(const shared_count& __a, const shared_count& __b)
+ { return __a._M_pi == __b._M_pi; }
+
+ friend inline bool
+ operator<(const shared_count& __a, const shared_count& __b)
+ { return std::less<_Sp_counted_base<__l>*>()(__a._M_pi, __b._M_pi); }
+
+ void*
+ get_deleter(const std::type_info& __ti) const
+ { return _M_pi ? _M_pi->get_deleter(__ti) : 0; }
+ };
- weak_count&
- operator=(const shared_count& __r) // nothrow
+template<_Lock_policy __l>
+ class weak_count
{
- _Sp_counted_base* __tmp = __r._M_pi;
- if (__tmp != 0)
- __tmp->weak_add_ref();
- if (_M_pi != 0)
- _M_pi->weak_release();
- _M_pi = __tmp;
-
- return *this;
- }
+ private:
+
+ _Sp_counted_base<__l>* _M_pi;
+
+ friend class shared_count<__l>;
+
+ public:
+
+ weak_count()
+ : _M_pi(0) // nothrow
+ { }
+
+ weak_count(const shared_count<__l>& __r)
+ : _M_pi(__r._M_pi) // nothrow
+ {
+ if (_M_pi != 0)
+ _M_pi->weak_add_ref();
+ }
+
+ weak_count(const weak_count<__l>& __r)
+ : _M_pi(__r._M_pi) // nothrow
+ {
+ if (_M_pi != 0)
+ _M_pi->weak_add_ref();
+ }
+
+ ~weak_count() // nothrow
+ {
+ if (_M_pi != 0)
+ _M_pi->weak_release();
+ }
+
+ weak_count<__l>&
+ operator=(const shared_count<__l>& __r) // nothrow
+ {
+ _Sp_counted_base<__l>* __tmp = __r._M_pi;
+ if (__tmp != 0)
+ __tmp->weak_add_ref();
+ if (_M_pi != 0)
+ _M_pi->weak_release();
+ _M_pi = __tmp;
+
+ return *this;
+ }
+
+ weak_count<__l>&
+ operator=(const weak_count<__l>& __r) // nothrow
+ {
+ _Sp_counted_base<__l> * __tmp = __r._M_pi;
+ if (__tmp != 0)
+ __tmp->weak_add_ref();
+ if (_M_pi != 0)
+ _M_pi->weak_release();
+ _M_pi = __tmp;
+
+ return *this;
+ }
+
+ void
+ swap(weak_count<__l>& __r) // nothrow
+ {
+ _Sp_counted_base<__l> * __tmp = __r._M_pi;
+ __r._M_pi = _M_pi;
+ _M_pi = __tmp;
+ }
+
+ long
+ use_count() const // nothrow
+ { return _M_pi != 0 ? _M_pi->use_count() : 0; }
+
+ friend inline bool
+ operator==(const weak_count<__l>& __a, const weak_count<__l>& __b)
+ { return __a._M_pi == __b._M_pi; }
+
+ friend inline bool
+ operator<(const weak_count<__l>& __a, const weak_count<__l>& __b)
+ { return std::less<_Sp_counted_base<__l>*>()(__a._M_pi, __b._M_pi); }
+ };
- weak_count&
- operator=(const weak_count& __r) // nothrow
+template<_Lock_policy __l>
+ inline
+ shared_count<__l>::shared_count(const weak_count<__l>& __r)
+ : _M_pi(__r._M_pi)
{
- _Sp_counted_base * __tmp = __r._M_pi;
- if (__tmp != 0)
- __tmp->weak_add_ref();
if (_M_pi != 0)
- _M_pi->weak_release();
- _M_pi = __tmp;
-
- return *this;
- }
-
- void
- swap(weak_count& __r) // nothrow
- {
- _Sp_counted_base * __tmp = __r._M_pi;
- __r._M_pi = _M_pi;
- _M_pi = __tmp;
+ _M_pi->add_ref_lock();
+ else
+ __throw_bad_weak_ptr();
}
- long
- use_count() const // nothrow
- { return _M_pi != 0 ? _M_pi->use_count() : 0; }
-
- friend inline bool
- operator==(const weak_count& __a, const weak_count& __b)
- { return __a._M_pi == __b._M_pi; }
-
- friend inline bool
- operator<(const weak_count& __a, const weak_count& __b)
- { return std::less<_Sp_counted_base*>()(__a._M_pi, __b._M_pi); }
-};
-
-inline
-shared_count::shared_count(const weak_count& __r)
-: _M_pi(__r._M_pi)
-{
- if (_M_pi != 0)
- _M_pi->add_ref_lock();
- else
- __throw_bad_weak_ptr();
-}
-
// fwd decls
-template<typename _Tp>
- class shared_ptr;
+template<typename _Tp, _Lock_policy __l = __shared_ptr_default_lock_mode>
+ class __shared_ptr;
-template<typename _Tp>
- class weak_ptr;
+template<typename _Tp, _Lock_policy __l = __shared_ptr_default_lock_mode>
+ class __weak_ptr;
-template<typename _Tp>
- class enable_shared_from_this;
+template<typename _Tp, _Lock_policy __l>
+ class __enable_shared_from_this;
struct __static_cast_tag {};
struct __const_cast_tag {};
// enable_shared_from_this support
-// friend of enable_shared_from_this
-template<typename _Tp1, typename _Tp2>
+// friend of __enable_shared_from_this
+template<_Lock_policy __l, typename _Tp1, typename _Tp2>
void
- __enable_shared_from_this(const shared_count& __pn,
- const enable_shared_from_this<_Tp1>* __pe,
+ __enable_shared_from_this_helper(const shared_count<__l>& __pn,
+ const __enable_shared_from_this<_Tp1, __l>* __pe,
const _Tp2* __px );
-inline void
-__enable_shared_from_this(const shared_count&, ...)
-{ }
+template<_Lock_policy __l>
+ inline void
+ __enable_shared_from_this_helper(const shared_count<__l>&, ...)
+ { }
// get_deleter must be declared before friend declaration by shared_ptr.
-template<typename _Del, typename _Tp>
- _Del* get_deleter(const shared_ptr<_Tp>&);
+template<typename _Del, typename _Tp, _Lock_policy __l>
+ _Del* get_deleter(const __shared_ptr<_Tp, __l>&);
/**
* @class shared_ptr <tr1/memory>
* The object pointed to is deleted when the last shared_ptr pointing to it
* is destroyed or reset.
*/
-template<typename _Tp>
- class shared_ptr
+template<typename _Tp, _Lock_policy __l>
+ class __shared_ptr
{
typedef typename shared_ptr_traits<_Tp>::reference _Reference;
typedef _Tp element_type;
- /** @brief Construct an empty %shared_ptr.
+ /** @brief Construct an empty %__shared_ptr.
* @post use_count()==0 && get()==0
*/
- shared_ptr()
+ __shared_ptr()
: _M_ptr(0), _M_refcount() // never throws
{ }
- /** @brief Construct a %shared_ptr that owns the pointer @a p.
+ /** @brief Construct a %__shared_ptr that owns the pointer @a p.
* @param p A pointer that is convertible to element_type*.
* @post use_count() == 1 && get() == p
* @throw std::bad_alloc, in which case @c delete @a p is called.
*/
template<typename _Tp1>
- explicit shared_ptr(_Tp1* __p)
+ explicit __shared_ptr(_Tp1* __p)
: _M_ptr(__p), _M_refcount(__p, _Sp_deleter<_Tp1>())
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// __glibcxx_function_requires(_CompleteConcept<_Tp1*>)
- __enable_shared_from_this( _M_refcount, __p, __p );
+ __enable_shared_from_this_helper( _M_refcount, __p, __p );
}
//
// Requirements: D's copy constructor and destructor must not throw
//
- // shared_ptr will release p by calling d(p)
+ // __shared_ptr will release p by calling d(p)
//
- /** @brief Construct a %shared_ptr that owns the pointer @a p
+ /** @brief Construct a %__shared_ptr that owns the pointer @a p
* and the deleter @a d.
* @param p A pointer.
* @param d A deleter.
* @throw std::bad_alloc, in which case @a d(p) is called.
*/
template<typename _Tp1, typename _Deleter>
- shared_ptr(_Tp1* __p, _Deleter __d)
+ __shared_ptr(_Tp1* __p, _Deleter __d)
: _M_ptr(__p), _M_refcount(__p, __d)
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
// TODO requires D is CopyConstructible and d(p) well-formed
- __enable_shared_from_this( _M_refcount, __p, __p );
+ __enable_shared_from_this_helper( _M_refcount, __p, __p );
}
// generated copy constructor, assignment, destructor are fine.
- /** @brief If @a r is empty, constructs an empty %shared_ptr; otherwise
- * construct a %shared_ptr that shares ownership with @a r.
- * @param r A %shared_ptr.
+ /** @brief If @a r is empty, constructs an empty %__shared_ptr; otherwise
+ * construct a %__shared_ptr that shares ownership with @a r.
+ * @param r A %__shared_ptr.
* @post get() == r.get() && use_count() == r.use_count()
* @throw std::bad_alloc, in which case
*/
template<typename _Tp1>
- shared_ptr(const shared_ptr<_Tp1>& __r)
+ __shared_ptr(const __shared_ptr<_Tp1, __l>& __r)
: _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) // never throws
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
}
- /** @brief Constructs a %shared_ptr that shares ownership with @a r
+ /** @brief Constructs a %__shared_ptr that shares ownership with @a r
* and stores a copy of the pointer stored in @a r.
* @param r A weak_ptr.
* @post use_count() == r.use_count()
* in which case the constructor has no effect.
*/
template<typename _Tp1>
- explicit shared_ptr(const weak_ptr<_Tp1>& __r)
+ explicit __shared_ptr(const __weak_ptr<_Tp1, __l>& __r)
: _M_refcount(__r._M_refcount) // may throw
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
* @post use_count() == 1 and r.get() == 0
*/
template<typename _Tp1>
- explicit shared_ptr(std::auto_ptr<_Tp1>& __r)
+ explicit __shared_ptr(std::auto_ptr<_Tp1>& __r)
: _M_ptr(__r.get()), _M_refcount()
{
// TODO requires r.release() convertible to _Tp*, Tp1 is complete,
// delete r.release() well-formed
_Tp1 * __tmp = __r.get();
- _M_refcount = shared_count(__r);
+ _M_refcount = shared_count<__l>(__r);
- __enable_shared_from_this( _M_refcount, __tmp, __tmp );
+ __enable_shared_from_this_helper( _M_refcount, __tmp, __tmp );
}
template<typename _Tp1>
- shared_ptr(const shared_ptr<_Tp1>& __r, __static_cast_tag)
+ __shared_ptr(const __shared_ptr<_Tp1, __l>& __r, __static_cast_tag)
: _M_ptr(static_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{ }
template<typename _Tp1>
- shared_ptr(const shared_ptr<_Tp1>& __r, __const_cast_tag)
+ __shared_ptr(const __shared_ptr<_Tp1, __l>& __r, __const_cast_tag)
: _M_ptr(const_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{ }
template<typename _Tp1>
- shared_ptr(const shared_ptr<_Tp1>& __r, __dynamic_cast_tag)
+ __shared_ptr(const __shared_ptr<_Tp1, __l>& __r, __dynamic_cast_tag)
: _M_ptr(dynamic_cast<element_type*>(__r._M_ptr)),
_M_refcount(__r._M_refcount)
{
if (_M_ptr == 0) // need to allocate new counter -- the cast failed
- _M_refcount = shared_count();
+ _M_refcount = shared_count<__l>();
}
template<typename _Tp1>
- shared_ptr&
- operator=(const shared_ptr<_Tp1>& __r) // never throws
+ __shared_ptr&
+ operator=(const __shared_ptr<_Tp1, __l>& __r) // never throws
{
_M_ptr = __r._M_ptr;
_M_refcount = __r._M_refcount; // shared_count::op= doesn't throw
}
template<typename _Tp1>
- shared_ptr&
+ __shared_ptr&
operator=(std::auto_ptr<_Tp1>& __r)
{
- shared_ptr(__r).swap(*this);
+ __shared_ptr(__r).swap(*this);
return *this;
}
void
reset() // never throws
- { shared_ptr().swap(*this); }
+ { __shared_ptr().swap(*this); }
template<typename _Tp1>
void
{
_GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != _M_ptr); // catch self-reset
// errors
- shared_ptr(__p).swap(*this);
+ __shared_ptr(__p).swap(*this);
}
template<typename _Tp1, typename _Deleter>
void
reset(_Tp1 * __p, _Deleter __d)
- { shared_ptr(__p, __d).swap(*this); }
+ { __shared_ptr(__p, __d).swap(*this); }
// error to instantiate if _Tp is [cv-qual] void
_Reference
// implicit conversion to "bool"
private:
- typedef _Tp* shared_ptr::*__unspecified_bool_type;
+ typedef _Tp* __shared_ptr::*__unspecified_bool_type;
public:
operator __unspecified_bool_type() const // never throws
- { return _M_ptr == 0 ? 0 : &shared_ptr::_M_ptr; }
+ { return _M_ptr == 0 ? 0 : &__shared_ptr::_M_ptr; }
bool
unique() const // never throws
{ return _M_refcount.use_count(); }
void
- swap(shared_ptr<_Tp>& __other) // never throws
+ swap(__shared_ptr<_Tp, __l>& __other) // never throws
{
std::swap(_M_ptr, __other._M_ptr);
_M_refcount.swap(__other._M_refcount);
_M_get_deleter(const std::type_info& __ti) const
{ return _M_refcount.get_deleter(__ti); }
- template<typename _Tp1>
+ template<typename _Tp1, _Lock_policy __l1>
bool
- _M_less(const shared_ptr<_Tp1>& __rhs) const
+ _M_less(const __shared_ptr<_Tp1, __l1>& __rhs) const
{ return _M_refcount < __rhs._M_refcount; }
- template<typename _Tp1> friend class shared_ptr;
- template<typename _Tp1> friend class weak_ptr;
+ template<typename _Tp1, _Lock_policy __l1> friend class __shared_ptr;
+ template<typename _Tp1, _Lock_policy __l1> friend class __weak_ptr;
- template<typename _Del, typename _Tp1>
- friend _Del* get_deleter(const shared_ptr<_Tp1>&);
+ template<typename _Del, typename _Tp1, _Lock_policy __l1>
+ friend _Del* get_deleter(const __shared_ptr<_Tp1, __l1>&);
// friends injected into enclosing namespace and found by ADL:
template<typename _Tp1>
friend inline bool
- operator==(const shared_ptr& __a, const shared_ptr<_Tp1>& __b)
+ operator==(const __shared_ptr& __a, const __shared_ptr<_Tp1, __l>& __b)
{ return __a.get() == __b.get(); }
template<typename _Tp1>
friend inline bool
- operator!=(const shared_ptr& __a, const shared_ptr<_Tp1>& __b)
+ operator!=(const __shared_ptr& __a, const __shared_ptr<_Tp1, __l>& __b)
{ return __a.get() != __b.get(); }
template<typename _Tp1>
friend inline bool
- operator<(const shared_ptr& __a, const shared_ptr<_Tp1>& __b)
+ operator<(const __shared_ptr& __a, const __shared_ptr<_Tp1, __l>& __b)
{ return __a._M_less(__b); }
_Tp* _M_ptr; // contained pointer
- shared_count _M_refcount; // reference counter
- }; // shared_ptr
+ shared_count<__l> _M_refcount; // reference counter
+ }; // __shared_ptr
// 2.2.3.8 shared_ptr specialized algorithms.
-template<typename _Tp>
+template<typename _Tp, _Lock_policy __l>
inline void
- swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>& __b)
+ swap(__shared_ptr<_Tp, __l>& __a, __shared_ptr<_Tp, __l>& __b)
{ __a.swap(__b); }
// 2.2.3.9 shared_ptr casts
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
-template<typename _Tp, typename _Tp1>
- shared_ptr<_Tp>
- static_pointer_cast(const shared_ptr<_Tp1>& __r)
+template<typename _Tp, typename _Tp1, _Lock_policy __l>
+ __shared_ptr<_Tp, __l>
+ static_pointer_cast(const __shared_ptr<_Tp1, __l>& __r)
{
- return shared_ptr<_Tp>(__r, __static_cast_tag());
+ return __shared_ptr<_Tp, __l>(__r, __static_cast_tag());
}
/** @warning The seemingly equivalent
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
-template<typename _Tp, typename _Tp1>
- shared_ptr<_Tp>
- const_pointer_cast(const shared_ptr<_Tp1>& __r)
+template<typename _Tp, typename _Tp1, _Lock_policy __l>
+ __shared_ptr<_Tp, __l>
+ const_pointer_cast(const __shared_ptr<_Tp1, __l>& __r)
{
- return shared_ptr<_Tp>(__r, __const_cast_tag());
+ return __shared_ptr<_Tp, __l>(__r, __const_cast_tag());
}
/** @warning The seemingly equivalent
* will eventually result in undefined behaviour,
* attempting to delete the same object twice.
*/
-template<typename _Tp, typename _Tp1>
- shared_ptr<_Tp>
- dynamic_pointer_cast(const shared_ptr<_Tp1>& __r)
+template<typename _Tp, typename _Tp1, _Lock_policy __l>
+ __shared_ptr<_Tp, __l>
+ dynamic_pointer_cast(const __shared_ptr<_Tp1, __l>& __r)
{
- return shared_ptr<_Tp>(__r, __dynamic_cast_tag());
+ return __shared_ptr<_Tp, __l>(__r, __dynamic_cast_tag());
}
// 2.2.3.7 shared_ptr I/O
-template<typename _Ch, typename _Tr, typename _Tp>
+template<typename _Ch, typename _Tr, typename _Tp, _Lock_policy __l>
std::basic_ostream<_Ch, _Tr>&
- operator<<(std::basic_ostream<_Ch, _Tr>& __os, const shared_ptr<_Tp>& __p)
+ operator<<(std::basic_ostream<_Ch, _Tr>& __os, const __shared_ptr<_Tp, __l>& __p)
{
__os << __p.get();
return __os;
}
// 2.2.3.10 shared_ptr get_deleter (experimental)
-template<typename _Del, typename _Tp>
+template<typename _Del, typename _Tp, _Lock_policy __l>
inline _Del*
- get_deleter(const shared_ptr<_Tp>& __p)
+ get_deleter(const __shared_ptr<_Tp, __l>& __p)
{ return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del))); }
-template<typename _Tp>
- class weak_ptr
+template<typename _Tp, _Lock_policy __l>
+ class __weak_ptr
{
public:
typedef _Tp element_type;
- weak_ptr()
+ __weak_ptr()
: _M_ptr(0), _M_refcount() // never throws
{ }
// The "obvious" converting constructor implementation:
//
// template<class Y>
- // weak_ptr(weak_ptr<Y> const & r)
+ // __weak_ptr(__weak_ptr<Y> const & r)
// : _M_ptr(r._M_ptr), _M_refcount(r._M_refcount) // never throws
// { }
//
//
template<typename _Tp1>
- weak_ptr(const weak_ptr<_Tp1>& r)
+ __weak_ptr(const __weak_ptr<_Tp1, __l>& r)
: _M_refcount(r._M_refcount) // never throws
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
}
template<typename _Tp1>
- weak_ptr(const shared_ptr<_Tp1>& r)
+ __weak_ptr(const __shared_ptr<_Tp1, __l>& r)
: _M_ptr(r._M_ptr), _M_refcount(r._M_refcount) // never throws
{
__glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
}
template<typename _Tp1>
- weak_ptr&
- operator=(const weak_ptr<_Tp1>& r) // never throws
+ __weak_ptr&
+ operator=(const __weak_ptr<_Tp1, __l>& r) // never throws
{
_M_ptr = r.lock().get();
_M_refcount = r._M_refcount;
}
template<typename _Tp1>
- weak_ptr&
- operator=(const shared_ptr<_Tp1>& r) // never throws
+ __weak_ptr&
+ operator=(const __shared_ptr<_Tp1, __l>& r) // never throws
{
_M_ptr = r._M_ptr;
_M_refcount = r._M_refcount;
return *this;
}
- shared_ptr<_Tp>
+ __shared_ptr<_Tp, __l>
lock() const // never throws
{
#ifdef __GTHREADS
// optimization: avoid throw overhead
if (expired())
- return shared_ptr<element_type>();
+ return __shared_ptr<element_type, __l>();
try
{
- return shared_ptr<element_type>(*this);
+ return __shared_ptr<element_type, __l>(*this);
}
catch (const bad_weak_ptr&)
{
// Q: how can we get here?
// A: another thread may have invalidated r after the
// use_count test above.
- return shared_ptr<element_type>();
+ return __shared_ptr<element_type>();
}
#else
// optimization: avoid try/catch overhead when single threaded
- return expired() ? shared_ptr<element_type>()
- : shared_ptr<element_type>(*this);
+ return expired() ? __shared_ptr<element_type, __l>()
+ : __shared_ptr<element_type, __l>(*this);
#endif
} // XXX MT
void
reset() // never throws
- { weak_ptr().swap(*this); }
+ { __weak_ptr().swap(*this); }
void
- swap(weak_ptr& __s) // never throws
+ swap(__weak_ptr& __s) // never throws
{
std::swap(_M_ptr, __s._M_ptr);
_M_refcount.swap(__s._M_refcount);
template<typename _Tp1>
bool
- _M_less(const weak_ptr<_Tp1>& __rhs) const
+ _M_less(const __weak_ptr<_Tp1, __l>& __rhs) const
{ return _M_refcount < __rhs._M_refcount; }
// used by __enable_shared_from_this
void
- _M_assign(_Tp* __ptr, const shared_count& __refcount)
+ _M_assign(_Tp* __ptr, const shared_count<__l>& __refcount)
{
_M_ptr = __ptr;
_M_refcount = __refcount;
template<typename _Tp1>
friend inline bool
- operator<(const weak_ptr& __lhs, const weak_ptr<_Tp1>& __rhs)
+ operator<(const __weak_ptr& __lhs, const __weak_ptr<_Tp1, __l>& __rhs)
{ return __lhs._M_less(__rhs); }
- template<typename _Tp1> friend class weak_ptr;
- template<typename _Tp1> friend class shared_ptr;
- friend class enable_shared_from_this<_Tp>;
+ template<typename _Tp1, _Lock_policy __l1> friend class __weak_ptr;
+ template<typename _Tp1, _Lock_policy __l1> friend class __shared_ptr;
+ friend class __enable_shared_from_this<_Tp, __l>;
_Tp* _M_ptr; // contained pointer
- weak_count _M_refcount; // reference counter
+ weak_count<__l> _M_refcount; // reference counter
- }; // weak_ptr
+ }; // __weak_ptr
// 2.2.4.7 weak_ptr specialized algorithms.
-template<typename _Tp>
+template<typename _Tp, _Lock_policy __l>
void
- swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b)
+ swap(__weak_ptr<_Tp, __l>& __a, __weak_ptr<_Tp, __l>& __b)
{ __a.swap(__b); }
-template<typename _Tp>
- class enable_shared_from_this
+template<typename _Tp, _Lock_policy __l = __shared_ptr_default_lock_mode>
+ class __enable_shared_from_this
{
protected:
- enable_shared_from_this()
+ __enable_shared_from_this()
{ }
- enable_shared_from_this(const enable_shared_from_this&)
+ __enable_shared_from_this(const __enable_shared_from_this&)
{ }
- enable_shared_from_this&
- operator=(const enable_shared_from_this&)
+ __enable_shared_from_this&
+ operator=(const __enable_shared_from_this&)
{ return *this; }
- ~enable_shared_from_this()
+ ~__enable_shared_from_this()
{ }
public:
- shared_ptr<_Tp>
+ __shared_ptr<_Tp, __l>
shared_from_this()
{
- shared_ptr<_Tp> __p(this->_M_weak_this);
+ __shared_ptr<_Tp, __l> __p(this->_M_weak_this);
return __p;
}
- shared_ptr<const _Tp>
+ __shared_ptr<const _Tp, __l>
shared_from_this() const
{
- shared_ptr<const _Tp> __p(this->_M_weak_this);
+ __shared_ptr<const _Tp, __l> __p(this->_M_weak_this);
return __p;
}
private:
template<typename _Tp1>
void
- _M_weak_assign(_Tp1* __p, const shared_count& __n) const
+ _M_weak_assign(_Tp1* __p, const shared_count<__l>& __n) const
{ _M_weak_this._M_assign(__p, __n); }
template<typename _Tp1>
friend void
- __enable_shared_from_this(const shared_count& __pn,
- const enable_shared_from_this* __pe,
- const _Tp1* __px)
+ __enable_shared_from_this_helper(const shared_count<__l>& __pn,
+ const __enable_shared_from_this* __pe,
+ const _Tp1* __px)
{
if(__pe != 0)
__pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
}
- mutable weak_ptr<_Tp> _M_weak_this;
+ mutable __weak_ptr<_Tp, __l> _M_weak_this;
+ };
+
+template<typename _Tp>
+ class shared_ptr;
+
+// The actual TR1 weak_ptr, with forwarding constructors and assignment operators.
+template<typename _Tp>
+ class weak_ptr
+ : public __weak_ptr<_Tp>
+ {
+ public:
+ weak_ptr()
+ : __weak_ptr<_Tp>()
+ { }
+
+ template<typename _Tp1>
+ weak_ptr(const __weak_ptr<_Tp1>& r)
+ : __weak_ptr<_Tp>(r)
+ { }
+
+ template<typename _Tp1>
+ weak_ptr(const __shared_ptr<_Tp1>& r)
+ : __weak_ptr<_Tp>(r)
+ { }
+ template<typename _Tp1>
+ weak_ptr&
+ operator=(const weak_ptr<_Tp1>& r) // never throws
+ {
+ this->__weak_ptr<_Tp>::operator=(r);
+ return *this;
+ }
+
+ template<typename _Tp1>
+ weak_ptr&
+ operator=(const shared_ptr<_Tp1>& r) // never throws
+ {
+ this->__weak_ptr<_Tp>::operator=(r);
+ return *this;
+ }
+ };
+
+// The actual TR1 shared_ptr, with forwarding constructors and assignment operators.
+template<typename _Tp>
+ class shared_ptr
+ : public __shared_ptr<_Tp>
+ {
+ public:
+ shared_ptr()
+ : __shared_ptr<_Tp>()
+ { }
+
+ template<typename _Tp1>
+ explicit shared_ptr(_Tp1* __p)
+ : __shared_ptr<_Tp>(__p)
+ { }
+
+ template<typename _Tp1, typename _Deleter>
+ shared_ptr(_Tp1* __p, _Deleter __d)
+ : __shared_ptr<_Tp>(__p, __d)
+ { }
+
+ template<typename _Tp1>
+ shared_ptr(const __shared_ptr<_Tp1>& __r)
+ : __shared_ptr<_Tp>(__r)
+ { }
+
+ template<typename _Tp1>
+ explicit shared_ptr(const __weak_ptr<_Tp1>& __r)
+ : __shared_ptr<_Tp>(__r)
+ { }
+
+ template<typename _Tp1>
+ explicit shared_ptr(std::auto_ptr<_Tp1>& __r)
+ : __shared_ptr<_Tp>(__r)
+ { }
+ template<typename _Tp1>
+ shared_ptr(const __shared_ptr<_Tp1>& __r, __static_cast_tag)
+ : __shared_ptr<_Tp>(__r, __static_cast_tag())
+ { }
+ template<typename _Tp1>
+ shared_ptr(const __shared_ptr<_Tp1>& __r, __const_cast_tag)
+ : __shared_ptr<_Tp>(__r, __const_cast_tag())
+ { }
+
+ template<typename _Tp1>
+ shared_ptr(const __shared_ptr<_Tp1>& __r, __dynamic_cast_tag)
+ : __shared_ptr<_Tp>(__r, __dynamic_cast_tag())
+ { }
+ // Additional non-base assignment operators to avoid excessive errors.
+ template<typename _Tp1>
+ shared_ptr&
+ operator=(std::auto_ptr<_Tp1>& __r)
+ {
+ this->__shared_ptr<_Tp>::operator=(__r);
+ return *this;
+ }
+ template<typename _Tp1>
+ shared_ptr&
+ operator=(const shared_ptr<_Tp1>& __r) // never throws
+ {
+ this->__shared_ptr<_Tp>::operator=(__r);
+ return *this;
+ }
+ };
+
+template<typename _Tp>
+ class enable_shared_from_this
+ : public __enable_shared_from_this<_Tp>
+ {
+ protected:
+ enable_shared_from_this()
+ : __enable_shared_from_this<_Tp>()
+ { }
+
+ enable_shared_from_this(const enable_shared_from_this&)
+ : __enable_shared_from_this<_Tp>(enable_shared_from_this<_Tp>())
+ { }
};
_GLIBCXX_END_NAMESPACE
projects / gcc.git / commitdiff