-// <bits/shared_ptr.h> -*- C++ -*-
+// shared_ptr and weak_ptr implementation -*- C++ -*-
-// Copyright (C) 2007, 2008 Free Software Foundation, Inc.
+// Copyright (C) 2007, 2008, 2009, 2010, 2011 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
// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 2, or (at your option)
+// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING. If not, write to the Free
-// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-// USA.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+// GCC Note: Based on files from version 1.32.0 of the Boost library.
// shared_count.hpp
// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
-// GCC Note: based on version 1.32.0 of the Boost library.
-
/** @file bits/shared_ptr.h
* This is an internal header file, included by other library headers.
- * You should not attempt to use it directly.
+ * Do not attempt to use it directly. @headername{memory}
*/
-#ifndef __GXX_EXPERIMENTAL_CXX0X__
-# include <c++0x_warning.h>
-#endif
+#ifndef _SHARED_PTR_H
+#define _SHARED_PTR_H 1
-#if defined(_GLIBCXX_INCLUDE_AS_TR1)
-# error C++0x header cannot be included from TR1 header
-#endif
+#include <bits/shared_ptr_base.h>
-namespace std
+namespace std _GLIBCXX_VISIBILITY(default)
{
- // counted ptr with no deleter or allocator support
- template<typename _Ptr, _Lock_policy _Lp>
- class _Sp_counted_ptr
- : public _Sp_counted_base<_Lp>
- {
- public:
- _Sp_counted_ptr(_Ptr __p)
- : _M_ptr(__p) { }
-
- virtual void
- _M_dispose() // nothrow
- { delete _M_ptr; }
-
- virtual void
- _M_destroy() // nothrow
- { delete this; }
-
- virtual void*
- _M_get_deleter(const std::type_info& __ti)
- { return 0; }
-
- _Sp_counted_ptr(const _Sp_counted_ptr&) = delete;
- _Sp_counted_ptr& operator=(const _Sp_counted_ptr&) = delete;
-
- protected:
- _Ptr _M_ptr; // copy constructor must not throw
- };
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
- // support for custom deleter and/or allocator
- template<typename _Ptr, typename _Deleter, typename _Alloc, _Lock_policy _Lp>
- class _Sp_counted_deleter
- : public _Sp_counted_ptr<_Ptr, _Lp>
- {
- typedef typename _Alloc::template
- rebind<_Sp_counted_deleter>::other _My_alloc_type;
-
- // Helper class that stores the Deleter and also acts as an allocator.
- // Used to dispose of the owned pointer and the internal refcount
- // Requires that copies of _Alloc can free each other's memory.
- struct _My_Deleter
- : public _My_alloc_type // copy constructor must not throw
- {
- _Deleter _M_del; // copy constructor must not throw
- _My_Deleter(_Deleter __d, const _Alloc& __a)
- : _My_alloc_type(__a), _M_del(__d) { }
- };
-
- protected:
- typedef _Sp_counted_ptr<_Ptr, _Lp> _Base_type;
-
- public:
- /**
- * @brief
- * @pre __d(__p) must not throw.
- */
- _Sp_counted_deleter(_Ptr __p, _Deleter __d)
- : _Base_type(__p), _M_del(__d, _Alloc()) { }
-
- /**
- * @brief
- * @pre __d(__p) must not throw.
- */
- _Sp_counted_deleter(_Ptr __p, _Deleter __d, const _Alloc& __a)
- : _Base_type(__p), _M_del(__d, __a) { }
-
- virtual void
- _M_dispose() // nothrow
- { _M_del._M_del(_Base_type::_M_ptr); }
-
- virtual void
- _M_destroy() // nothrow
- {
- _My_alloc_type __a(_M_del);
- this->~_Sp_counted_deleter();
- __a.deallocate(this, 1);
- }
-
- virtual void*
- _M_get_deleter(const std::type_info& __ti)
- { return __ti == typeid(_Deleter) ? &_M_del._M_del : 0; }
-
- protected:
- _My_Deleter _M_del; // copy constructor must not throw
- };
-
- // helpers for make_shared / allocate_shared
-
- template<typename _Tp>
- struct _Sp_destroy_inplace
- {
- void operator()(_Tp* __p) const { if (__p) __p->~_Tp(); }
- };
-
- struct _Sp_make_shared_tag { };
+ /**
+ * @addtogroup pointer_abstractions
+ * @{
+ */
- template<typename _Tp, typename _Alloc, _Lock_policy _Lp>
- class _Sp_counted_ptr_inplace
- : public _Sp_counted_deleter<_Tp*, _Sp_destroy_inplace<_Tp>, _Alloc, _Lp>
+ /// 2.2.3.7 shared_ptr I/O
+ template<typename _Ch, typename _Tr, typename _Tp, _Lock_policy _Lp>
+ inline std::basic_ostream<_Ch, _Tr>&
+ operator<<(std::basic_ostream<_Ch, _Tr>& __os,
+ const __shared_ptr<_Tp, _Lp>& __p)
{
- typedef _Sp_counted_deleter<_Tp*, _Sp_destroy_inplace<_Tp>, _Alloc, _Lp>
- _Base_type;
-
- public:
- _Sp_counted_ptr_inplace(_Alloc __a)
- : _Base_type(static_cast<_Tp*>(0), _Sp_destroy_inplace<_Tp>(), __a)
- , _M_storage()
- {
- void* __p = &_M_storage;
- ::new (__p) _Tp(); // might throw
- _Base_type::_Base_type::_M_ptr = static_cast<_Tp*>(__p);
- }
-
- template<typename... _Args>
- _Sp_counted_ptr_inplace(_Alloc __a, _Args&&... __args)
- : _Base_type(static_cast<_Tp*>(0), _Sp_destroy_inplace<_Tp>(), __a)
- , _M_storage()
- {
- void* __p = &_M_storage;
- ::new (__p) _Tp(std::forward<_Args>(__args)...); // might throw
- _Base_type::_Base_type::_M_ptr = static_cast<_Tp*>(__p);
- }
-
- // override because the allocator needs to know the dynamic type
- virtual void
- _M_destroy() // nothrow
- {
- typedef typename _Alloc::template
- rebind<_Sp_counted_ptr_inplace>::other _My_alloc_type;
- _My_alloc_type __a(_Base_type::_M_del);
- this->~_Sp_counted_ptr_inplace();
- __a.deallocate(this, 1);
- }
-
- // sneaky trick so __shared_ptr can get the managed pointer
- virtual void*
- _M_get_deleter(const std::type_info& __ti)
- {
- return __ti == typeid(_Sp_make_shared_tag)
- ? static_cast<void*>(&_M_storage)
- : _Base_type::_M_get_deleter(__ti);
- }
-
- private:
- typename aligned_storage<sizeof(_Tp), alignment_of<_Tp>::value>::type
- _M_storage;
- };
-
- template<_Lock_policy _Lp = __default_lock_policy>
- class __weak_count;
+ __os << __p.get();
+ return __os;
+ }
- template<_Lock_policy _Lp = __default_lock_policy>
- class __shared_count
+ /// 2.2.3.10 shared_ptr get_deleter (experimental)
+ template<typename _Del, typename _Tp, _Lock_policy _Lp>
+ inline _Del*
+ get_deleter(const __shared_ptr<_Tp, _Lp>& __p)
{
- public:
- __shared_count()
- : _M_pi(0) // nothrow
- { }
-
- template<typename _Ptr>
- __shared_count(_Ptr __p) : _M_pi(0)
- {
- try
- {
- _M_pi = new _Sp_counted_ptr<_Ptr, _Lp>(__p);
- }
- catch(...)
- {
- delete __p;
- __throw_exception_again;
- }
- }
-
- template<typename _Ptr, typename _Deleter>
- __shared_count(_Ptr __p, _Deleter __d) : _M_pi(0)
- {
- // allocator's value_type doesn't matter, will rebind it anyway
- typedef std::allocator<int> _Alloc;
- typedef _Sp_counted_deleter<_Ptr, _Deleter, _Alloc, _Lp> _Sp_cd_type;
- typedef std::allocator<_Sp_cd_type> _Alloc2;
- _Alloc2 __a2;
- try
- {
- _M_pi = __a2.allocate(1);
- ::new(static_cast<void*>(_M_pi)) _Sp_cd_type(__p, __d);
- }
- catch(...)
- {
- __d(__p); // Call _Deleter on __p.
- if (_M_pi)
- __a2.deallocate(static_cast<_Sp_cd_type*>(_M_pi), 1);
- __throw_exception_again;
- }
- }
-
- template<typename _Ptr, typename _Deleter, typename _Alloc>
- __shared_count(_Ptr __p, _Deleter __d, _Alloc __a) : _M_pi(0)
- {
- typedef _Sp_counted_deleter<_Ptr, _Deleter, _Alloc, _Lp> _Sp_cd_type;
- typedef typename _Alloc::template rebind<_Sp_cd_type>::other _Alloc2;
- _Alloc2 __a2(__a);
- try
- {
- _M_pi = __a2.allocate(1);
- ::new(static_cast<void*>(_M_pi)) _Sp_cd_type(__p, __d, __a);
- }
- catch(...)
- {
- __d(__p); // Call _Deleter on __p.
- if (_M_pi)
- __a2.deallocate(static_cast<_Sp_cd_type*>(_M_pi), 1);
- __throw_exception_again;
- }
- }
-
- template<typename _Tp, typename _Alloc, typename... _Args>
- __shared_count(_Sp_make_shared_tag, _Tp*, _Alloc __a, _Args&&... __args)
- : _M_pi(0)
- {
- typedef _Sp_counted_ptr_inplace<_Tp, _Alloc, _Lp> _Sp_cp_type;
- typedef typename _Alloc::template rebind<_Sp_cp_type>::other _Alloc2;
- _Alloc2 __a2(__a);
- try
- {
- _M_pi = __a2.allocate(1);
- ::new(static_cast<void*>(_M_pi)) _Sp_cp_type(__a,
- std::forward<_Args>(__args)...);
- }
- catch(...)
- {
- if (_M_pi)
- __a2.deallocate(static_cast<_Sp_cp_type*>(_M_pi), 1);
- __throw_exception_again;
- }
- }
-
-#if _GLIBCXX_DEPRECATED
- // Special case for auto_ptr<_Tp> to provide the strong guarantee.
- template<typename _Tp>
- explicit
- __shared_count(std::auto_ptr<_Tp>&& __r)
- : _M_pi(new _Sp_counted_ptr<_Tp*, _Lp>(__r.get()))
- { __r.release(); }
+#ifdef __GXX_RTTI
+ return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del)));
+#else
+ return 0;
#endif
-
- // Special case for unique_ptr<_Tp,_Del> to provide the strong guarantee.
- template<typename _Tp, typename _Del>
- explicit
- __shared_count(std::unique_ptr<_Tp, _Del>&& __r)
- : _M_pi(_S_create_from_up(std::move(__r)))
- { __r.release(); }
-
- // Throw bad_weak_ptr when __r._M_get_use_count() == 0.
- explicit
- __shared_count(const __weak_count<_Lp>& __r);
-
- ~__shared_count() // nothrow
- {
- if (_M_pi != 0)
- _M_pi->_M_release();
- }
-
- __shared_count(const __shared_count& __r)
- : _M_pi(__r._M_pi) // nothrow
- {
- if (_M_pi != 0)
- _M_pi->_M_add_ref_copy();
- }
-
- __shared_count&
- operator=(const __shared_count& __r) // nothrow
- {
- _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
- if (__tmp != _M_pi)
- {
- if (__tmp != 0)
- __tmp->_M_add_ref_copy();
- if (_M_pi != 0)
- _M_pi->_M_release();
- _M_pi = __tmp;
- }
- return *this;
- }
-
- void
- _M_swap(__shared_count& __r) // nothrow
- {
- _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
- __r._M_pi = _M_pi;
- _M_pi = __tmp;
- }
-
- long
- _M_get_use_count() const // nothrow
- { return _M_pi != 0 ? _M_pi->_M_get_use_count() : 0; }
-
- bool
- _M_unique() const // nothrow
- { return this->_M_get_use_count() == 1; }
-
- void*
- _M_get_deleter(const std::type_info& __ti) const
- { return _M_pi ? _M_pi->_M_get_deleter(__ti) : 0; }
-
- bool
- _M_less(const __shared_count& __rhs) const
- { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
-
- bool
- _M_less(const __weak_count<_Lp>& __rhs) const
- { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
-
- // friend function injected into enclosing namespace and found by ADL
- friend inline bool
- operator==(const __shared_count& __a, const __shared_count& __b)
- { return __a._M_pi == __b._M_pi; }
-
- private:
- friend class __weak_count<_Lp>;
-
- template<typename _Tp, typename _Del>
- static _Sp_counted_base<_Lp>*
- _S_create_from_up(std::unique_ptr<_Tp, _Del>&& __r,
- typename std::enable_if<!std::is_reference<_Del>::value>::type* = 0)
- {
- return new _Sp_counted_deleter<_Tp*, _Del, std::allocator<_Tp>,
- _Lp>(__r.get(), __r.get_deleter());
- }
-
- template<typename _Tp, typename _Del>
- static _Sp_counted_base<_Lp>*
- _S_create_from_up(std::unique_ptr<_Tp, _Del>&& __r,
- typename std::enable_if<std::is_reference<_Del>::value>::type* = 0)
- {
- typedef typename std::remove_reference<_Del>::type _Del1;
- typedef std::reference_wrapper<_Del1> _Del2;
- return new _Sp_counted_deleter<_Tp*, _Del2, std::allocator<_Tp>,
- _Lp>(__r.get(), std::ref(__r.get_deleter()));
- }
-
- _Sp_counted_base<_Lp>* _M_pi;
- };
-
-
- template<_Lock_policy _Lp>
- class __weak_count
- {
- public:
- __weak_count()
- : _M_pi(0) // nothrow
- { }
-
- __weak_count(const __shared_count<_Lp>& __r)
- : _M_pi(__r._M_pi) // nothrow
- {
- if (_M_pi != 0)
- _M_pi->_M_weak_add_ref();
- }
-
- __weak_count(const __weak_count<_Lp>& __r)
- : _M_pi(__r._M_pi) // nothrow
- {
- if (_M_pi != 0)
- _M_pi->_M_weak_add_ref();
- }
-
- ~__weak_count() // nothrow
- {
- if (_M_pi != 0)
- _M_pi->_M_weak_release();
- }
-
- __weak_count<_Lp>&
- operator=(const __shared_count<_Lp>& __r) // nothrow
- {
- _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
- if (__tmp != 0)
- __tmp->_M_weak_add_ref();
- if (_M_pi != 0)
- _M_pi->_M_weak_release();
- _M_pi = __tmp;
- return *this;
- }
-
- __weak_count<_Lp>&
- operator=(const __weak_count<_Lp>& __r) // nothrow
- {
- _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
- if (__tmp != 0)
- __tmp->_M_weak_add_ref();
- if (_M_pi != 0)
- _M_pi->_M_weak_release();
- _M_pi = __tmp;
- return *this;
- }
-
- void
- _M_swap(__weak_count<_Lp>& __r) // nothrow
- {
- _Sp_counted_base<_Lp>* __tmp = __r._M_pi;
- __r._M_pi = _M_pi;
- _M_pi = __tmp;
- }
-
- long
- _M_get_use_count() const // nothrow
- { return _M_pi != 0 ? _M_pi->_M_get_use_count() : 0; }
-
- bool
- _M_less(const __weak_count& __rhs) const
- { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
-
- bool
- _M_less(const __shared_count<_Lp>& __rhs) const
- { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); }
-
- // friend function injected into enclosing namespace and found by ADL
- friend inline bool
- operator==(const __weak_count& __a, const __weak_count& __b)
- { return __a._M_pi == __b._M_pi; }
-
- private:
- friend class __shared_count<_Lp>;
-
- _Sp_counted_base<_Lp>* _M_pi;
- };
-
- // now that __weak_count is defined we can define this constructor:
- template<_Lock_policy _Lp>
- inline
- __shared_count<_Lp>::
- __shared_count(const __weak_count<_Lp>& __r)
- : _M_pi(__r._M_pi)
- {
- if (_M_pi != 0)
- _M_pi->_M_add_ref_lock();
- else
- __throw_bad_weak_ptr();
}
- // Forward declarations.
- template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
- class __shared_ptr;
-
- template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
- class __weak_ptr;
-
- template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
- class __enable_shared_from_this;
-
- template<typename _Tp>
- class shared_ptr;
-
- template<typename _Tp>
- class weak_ptr;
-
- template<typename _Tp>
- class enable_shared_from_this;
-
- // Support for enable_shared_from_this.
-
- // Friend of __enable_shared_from_this.
- template<_Lock_policy _Lp, typename _Tp1, typename _Tp2>
- void
- __enable_shared_from_this_helper(const __shared_count<_Lp>&,
- const __enable_shared_from_this<_Tp1,
- _Lp>*, const _Tp2*);
-
- // Friend of enable_shared_from_this.
- template<typename _Tp1, typename _Tp2>
- void
- __enable_shared_from_this_helper(const __shared_count<>&,
- const enable_shared_from_this<_Tp1>*,
- const _Tp2*);
-
- template<_Lock_policy _Lp>
- inline void
- __enable_shared_from_this_helper(const __shared_count<_Lp>&, ...)
- { }
-
/**
- * @class __shared_ptr
+ * @brief A smart pointer with reference-counted copy semantics.
*
- * A smart pointer with reference-counted copy semantics.
* The object pointed to is deleted when the last shared_ptr pointing to
* it is destroyed or reset.
- */
- template<typename _Tp, _Lock_policy _Lp>
- class __shared_ptr
+ */
+ template<typename _Tp>
+ class shared_ptr : public __shared_ptr<_Tp>
{
public:
- typedef _Tp element_type;
-
- /** @brief Construct an empty %__shared_ptr.
+ /**
+ * @brief Construct an empty %shared_ptr.
* @post use_count()==0 && get()==0
*/
- __shared_ptr()
- : _M_ptr(0), _M_refcount() // never throws
- { }
+ constexpr shared_ptr()
+ : __shared_ptr<_Tp>() { }
- /** @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)
- : _M_ptr(__p), _M_refcount(__p)
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- // __glibcxx_function_requires(_CompleteConcept<_Tp1*>)
- __enable_shared_from_this_helper(_M_refcount, __p, __p);
- }
+ explicit shared_ptr(_Tp1* __p)
+ : __shared_ptr<_Tp>(__p) { }
- //
- // Requirements: _Deleter's copy constructor and destructor must
- // not throw
- //
- // __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.
* @post use_count() == 1 && get() == __p
* @throw std::bad_alloc, in which case @a __d(__p) is called.
+ *
+ * Requirements: _Deleter's copy constructor and destructor must
+ * not throw
+ *
+ * __shared_ptr will release __p by calling __d(__p)
*/
template<typename _Tp1, typename _Deleter>
- __shared_ptr(_Tp1* __p, _Deleter __d)
- : _M_ptr(__p), _M_refcount(__p, __d)
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- // TODO requires _Deleter CopyConstructible and __d(__p) well-formed
- __enable_shared_from_this_helper(_M_refcount, __p, __p);
- }
-
- //
- // Requirements: _Deleter's copy constructor and destructor must
- // not throw _Alloc's copy constructor and destructor must not
- // throw.
- //
- // __shared_ptr will release __p by calling __d(__p)
- //
- /** @brief Construct a %__shared_ptr that owns the pointer @a __p
+ shared_ptr(_Tp1* __p, _Deleter __d)
+ : __shared_ptr<_Tp>(__p, __d) { }
+
+ /**
+ * @brief Construct a %shared_ptr that owns a null pointer
+ * and the deleter @a __d.
+ * @param __p A null pointer constant.
+ * @param __d A deleter.
+ * @post use_count() == 1 && get() == __p
+ * @throw std::bad_alloc, in which case @a __d(__p) is called.
+ *
+ * Requirements: _Deleter's copy constructor and destructor must
+ * not throw
+ *
+ * The last owner will call __d(__p)
+ */
+ template<typename _Deleter>
+ shared_ptr(nullptr_t __p, _Deleter __d)
+ : __shared_ptr<_Tp>(__p, __d) { }
+
+ /**
+ * @brief Construct a %shared_ptr that owns the pointer @a __p
* and the deleter @a __d.
* @param __p A pointer.
* @param __d A deleter.
* @param __a An allocator.
* @post use_count() == 1 && get() == __p
* @throw std::bad_alloc, in which case @a __d(__p) is called.
+ *
+ * Requirements: _Deleter's copy constructor and destructor must
+ * not throw _Alloc's copy constructor and destructor must not
+ * throw.
+ *
+ * __shared_ptr will release __p by calling __d(__p)
*/
template<typename _Tp1, typename _Deleter, typename _Alloc>
- __shared_ptr(_Tp1* __p, _Deleter __d, const _Alloc& __a)
- : _M_ptr(__p), _M_refcount(__p, __d, __a)
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- // TODO requires _Deleter CopyConstructible and __d(__p) well-formed
- __enable_shared_from_this_helper(_M_refcount, __p, __p);
- }
+ shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a)
+ : __shared_ptr<_Tp>(__p, __d, std::move(__a)) { }
- /** @brief Constructs a %__shared_ptr instance that stores @a __p
+ /**
+ * @brief Construct a %shared_ptr that owns a null pointer
+ * and the deleter @a __d.
+ * @param __p A null pointer constant.
+ * @param __d A deleter.
+ * @param __a An allocator.
+ * @post use_count() == 1 && get() == __p
+ * @throw std::bad_alloc, in which case @a __d(__p) is called.
+ *
+ * Requirements: _Deleter's copy constructor and destructor must
+ * not throw _Alloc's copy constructor and destructor must not
+ * throw.
+ *
+ * The last owner will call __d(__p)
+ */
+ template<typename _Deleter, typename _Alloc>
+ shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a)
+ : __shared_ptr<_Tp>(__p, __d, std::move(__a)) { }
+
+ // Aliasing constructor
+
+ /**
+ * @brief Constructs a %shared_ptr instance that stores @a __p
* and shares ownership with @a __r.
- * @param __r A %__shared_ptr.
+ * @param __r A %shared_ptr.
* @param __p A pointer that will remain valid while @a *__r is valid.
* @post get() == __p && use_count() == __r.use_count()
*
* @endcode
*/
template<typename _Tp1>
- __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, _Tp* __p)
- : _M_ptr(__p), _M_refcount(__r._M_refcount) // never throws
- { }
-
- // 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
+ shared_ptr(const shared_ptr<_Tp1>& __r, _Tp* __p)
+ : __shared_ptr<_Tp>(__r, __p) { }
+
+ /**
+ * @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.
+ * @param __r A %shared_ptr.
* @post get() == __r.get() && use_count() == __r.use_count()
*/
- template<typename _Tp1>
- __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r)
- : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) // never throws
- { __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) }
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ shared_ptr(const shared_ptr<_Tp1>& __r)
+ : __shared_ptr<_Tp>(__r) { }
- /** @brief Move-constructs a %__shared_ptr instance from @a __r.
- * @param __r A %__shared_ptr rvalue.
+ /**
+ * @brief Move-constructs a %shared_ptr instance from @a __r.
+ * @param __r A %shared_ptr rvalue.
* @post *this contains the old value of @a __r, @a __r is empty.
*/
- __shared_ptr(__shared_ptr&& __r)
- : _M_ptr(__r._M_ptr), _M_refcount() // never throws
- {
- _M_refcount._M_swap(__r._M_refcount);
- __r._M_ptr = 0;
- }
+ shared_ptr(shared_ptr&& __r)
+ : __shared_ptr<_Tp>(std::move(__r)) { }
- /** @brief Move-constructs a %__shared_ptr instance from @a __r.
- * @param __r A %__shared_ptr rvalue.
+ /**
+ * @brief Move-constructs a %shared_ptr instance from @a __r.
+ * @param __r A %shared_ptr rvalue.
* @post *this contains the old value of @a __r, @a __r is empty.
*/
- template<typename _Tp1>
- __shared_ptr(__shared_ptr<_Tp1, _Lp>&& __r)
- : _M_ptr(__r._M_ptr), _M_refcount() // never throws
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- _M_refcount._M_swap(__r._M_refcount);
- __r._M_ptr = 0;
- }
-
- /** @brief Constructs a %__shared_ptr that shares ownership with @a __r
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ shared_ptr(shared_ptr<_Tp1>&& __r)
+ : __shared_ptr<_Tp>(std::move(__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, _Lp>& __r)
- : _M_refcount(__r._M_refcount) // may throw
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- // It is now safe to copy __r._M_ptr, as _M_refcount(__r._M_refcount)
- // did not throw.
- _M_ptr = __r._M_ptr;
- }
+ explicit shared_ptr(const weak_ptr<_Tp1>& __r)
+ : __shared_ptr<_Tp>(__r) { }
- template<typename _Tp1, typename _Del>
- explicit
- __shared_ptr(const std::unique_ptr<_Tp1, _Del>&) = delete;
+#if _GLIBCXX_USE_DEPRECATED
+ template<typename _Tp1>
+ shared_ptr(std::auto_ptr<_Tp1>&& __r)
+ : __shared_ptr<_Tp>(std::move(__r)) { }
+#endif
- /**
- * If an exception is thrown this constructor has no effect.
- */
template<typename _Tp1, typename _Del>
- explicit
- __shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r)
- : _M_ptr(__r.get()), _M_refcount()
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- _Tp1* __tmp = __r.get();
- _M_refcount = __shared_count<_Lp>(std::move(__r));
- __enable_shared_from_this_helper(_M_refcount, __tmp, __tmp);
- }
+ shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r)
+ : __shared_ptr<_Tp>(std::move(__r)) { }
-#if _GLIBCXX_DEPRECATED
/**
- * @post use_count() == 1 and __r.get() == 0
+ * @brief Construct an empty %shared_ptr.
+ * @param __p A null pointer constant.
+ * @post use_count() == 0 && get() == nullptr
*/
- template<typename _Tp1>
- explicit
- __shared_ptr(std::auto_ptr<_Tp1>&& __r)
- : _M_ptr(__r.get()), _M_refcount()
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- // TODO requires _Tp1 is complete, delete __r.release() well-formed
- _Tp1* __tmp = __r.get();
- _M_refcount = __shared_count<_Lp>(std::move(__r));
- __enable_shared_from_this_helper(_M_refcount, __tmp, __tmp);
- }
-#endif
+ constexpr shared_ptr(nullptr_t __p)
+ : __shared_ptr<_Tp>(__p) { }
template<typename _Tp1>
- __shared_ptr&
- operator=(const __shared_ptr<_Tp1, _Lp>& __r) // never throws
- {
- _M_ptr = __r._M_ptr;
- _M_refcount = __r._M_refcount; // __shared_count::op= doesn't throw
+ shared_ptr&
+ operator=(const shared_ptr<_Tp1>& __r) // never throws
+ {
+ this->__shared_ptr<_Tp>::operator=(__r);
return *this;
}
-#if _GLIBCXX_DEPRECATED
+#if _GLIBCXX_USE_DEPRECATED
template<typename _Tp1>
- __shared_ptr&
- operator=(std::auto_ptr<_Tp1>&& __r)
- {
- __shared_ptr(std::move(__r)).swap(*this);
+ shared_ptr&
+ operator=(std::auto_ptr<_Tp1>&& __r)
+ {
+ this->__shared_ptr<_Tp>::operator=(std::move(__r));
return *this;
}
#endif
- __shared_ptr&
- operator=(__shared_ptr&& __r)
+ shared_ptr&
+ operator=(shared_ptr&& __r)
{
- __shared_ptr(std::move(__r)).swap(*this);
- return *this;
+ this->__shared_ptr<_Tp>::operator=(std::move(__r));
+ return *this;
}
-
- template<class _Tp1>
- __shared_ptr&
- operator=(__shared_ptr<_Tp1, _Lp>&& __r)
- {
- __shared_ptr(std::move(__r)).swap(*this);
- return *this;
- }
- template<typename _Tp1, typename _Del>
- __shared_ptr&
- operator=(const std::unique_ptr<_Tp1, _Del>& __r) = delete;
+ template<class _Tp1>
+ shared_ptr&
+ operator=(shared_ptr<_Tp1>&& __r)
+ {
+ this->__shared_ptr<_Tp>::operator=(std::move(__r));
+ return *this;
+ }
template<typename _Tp1, typename _Del>
- __shared_ptr&
- operator=(std::unique_ptr<_Tp1, _Del>&& __r)
- {
- __shared_ptr(std::move(__r)).swap(*this);
+ shared_ptr&
+ operator=(std::unique_ptr<_Tp1, _Del>&& __r)
+ {
+ this->__shared_ptr<_Tp>::operator=(std::move(__r));
return *this;
- }
-
- void
- reset() // never throws
- { __shared_ptr().swap(*this); }
-
- template<typename _Tp1>
- void
- reset(_Tp1* __p) // _Tp1 must be complete.
- {
- // Catch self-reset errors.
- _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != _M_ptr);
- __shared_ptr(__p).swap(*this);
}
- template<typename _Tp1, typename _Deleter>
- void
- reset(_Tp1* __p, _Deleter __d)
- { __shared_ptr(__p, __d).swap(*this); }
-
- template<typename _Tp1, typename _Deleter, typename _Alloc>
- void
- reset(_Tp1* __p, _Deleter __d, const _Alloc& __a)
- { __shared_ptr(__p, __d, __a).swap(*this); }
-
- // Allow class instantiation when _Tp is [cv-qual] void.
- typename std::add_lvalue_reference<_Tp>::type
- operator*() const // never throws
- {
- _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
- return *_M_ptr;
- }
-
- _Tp*
- operator->() const // never throws
- {
- _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0);
- return _M_ptr;
- }
-
- _Tp*
- get() const // never throws
- { return _M_ptr; }
-
- // Implicit conversion to "bool"
private:
- typedef _Tp* __shared_ptr::*__unspecified_bool_type;
-
- public:
- operator __unspecified_bool_type() const // never throws
- { return _M_ptr == 0 ? 0 : &__shared_ptr::_M_ptr; }
-
- bool
- unique() const // never throws
- { return _M_refcount._M_unique(); }
-
- long
- use_count() const // never throws
- { return _M_refcount._M_get_use_count(); }
-
- void
- swap(__shared_ptr<_Tp, _Lp>&& __other) // never throws
- {
- std::swap(_M_ptr, __other._M_ptr);
- _M_refcount._M_swap(__other._M_refcount);
- }
-
- template<typename _Tp1>
- bool
- owner_before(__shared_ptr<_Tp1, _Lp> const& __rhs) const
- { return _M_refcount._M_less(__rhs._M_refcount); }
-
- template<typename _Tp1>
- bool
- owner_before(__weak_ptr<_Tp1, _Lp> const& __rhs) const
- { return _M_refcount._M_less(__rhs._M_refcount); }
-
- protected:
// This constructor is non-standard, it is used by allocate_shared.
template<typename _Alloc, typename... _Args>
- __shared_ptr(_Sp_make_shared_tag __tag, _Alloc __a, _Args&&... __args)
- : _M_ptr(), _M_refcount(__tag, (_Tp*)0, __a,
- std::forward<_Args>(__args)...)
- {
- // _M_ptr needs to point to the newly constructed object.
- // This relies on _Sp_counted_ptr_inplace::_M_get_deleter.
- void* __p = _M_refcount._M_get_deleter(typeid(__tag));
- _M_ptr = static_cast<_Tp*>(__p);
- __enable_shared_from_this_helper(_M_refcount, _M_ptr, _M_ptr);
- }
-
- template<typename _Tp1, _Lock_policy _Lp1, typename _Alloc,
- typename... _Args>
- friend __shared_ptr<_Tp1, _Lp1>
- __allocate_shared(_Alloc __a, _Args&&... __args);
-
- private:
- void*
- _M_get_deleter(const std::type_info& __ti) const
- { return _M_refcount._M_get_deleter(__ti); }
-
- template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
- template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
+ shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a,
+ _Args&&... __args)
+ : __shared_ptr<_Tp>(__tag, __a, std::forward<_Args>(__args)...)
+ { }
- template<typename _Del, typename _Tp1, _Lock_policy _Lp1>
- friend _Del* get_deleter(const __shared_ptr<_Tp1, _Lp1>&);
-
- _Tp* _M_ptr; // Contained pointer.
- __shared_count<_Lp> _M_refcount; // Reference counter.
+ template<typename _Tp1, typename _Alloc, typename... _Args>
+ friend shared_ptr<_Tp1>
+ allocate_shared(const _Alloc& __a, _Args&&... __args);
};
// 20.8.13.2.7 shared_ptr comparisons
- template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+ template<typename _Tp1, typename _Tp2>
inline bool
- operator==(const __shared_ptr<_Tp1, _Lp>& __a,
- const __shared_ptr<_Tp2, _Lp>& __b)
+ operator==(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
{ return __a.get() == __b.get(); }
- template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+ template<typename _Tp>
inline bool
- operator!=(const __shared_ptr<_Tp1, _Lp>& __a,
- const __shared_ptr<_Tp2, _Lp>& __b)
- { return __a.get() != __b.get(); }
+ operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return !__a; }
- template<typename _Tp1, typename _Tp2, _Lock_policy _Lp>
+ template<typename _Tp>
inline bool
- operator<(const __shared_ptr<_Tp1, _Lp>& __a,
- const __shared_ptr<_Tp2, _Lp>& __b)
- { return __a.get() < __b.get(); }
-
- template<typename _Sp>
- struct _Sp_less : public binary_function<_Sp, _Sp, bool>
- {
- bool
- operator()(const _Sp& __lhs, const _Sp& __rhs) const
- {
- return std::less<typename _Sp::element_type*>()(__lhs.get(),
- __rhs.get());
- }
- };
-
- template<typename _Tp, _Lock_policy _Lp>
- struct less<__shared_ptr<_Tp, _Lp>>
- : public _Sp_less<__shared_ptr<_Tp, _Lp>>
- { };
+ operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return !__a; }
- // XXX LessThanComparable<_Tp> concept should provide >, >= and <=
- template<typename _Tp, _Lock_policy _Lp>
+ template<typename _Tp1, typename _Tp2>
inline bool
- operator>(const __shared_ptr<_Tp, _Lp>& __a,
- const __shared_ptr<_Tp, _Lp>& __b)
- { return __a.get() > __b.get(); }
+ operator!=(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ { return __a.get() != __b.get(); }
- template<typename _Tp, _Lock_policy _Lp>
+ template<typename _Tp>
inline bool
- operator>=(const __shared_ptr<_Tp, _Lp>& __a,
- const __shared_ptr<_Tp, _Lp>& __b)
- { return __a.get() >= __b.get(); }
+ operator!=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return (bool)__a; }
- template<typename _Tp, _Lock_policy _Lp>
+ template<typename _Tp>
inline bool
- operator<=(const __shared_ptr<_Tp, _Lp>& __a,
- const __shared_ptr<_Tp, _Lp>& __b)
- { return __a.get() <= __b.get(); }
+ operator!=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return (bool)__a; }
- // 2.2.3.8 shared_ptr specialized algorithms.
- template<typename _Tp, _Lock_policy _Lp>
- inline void
- swap(__shared_ptr<_Tp, _Lp>& __a, __shared_ptr<_Tp, _Lp>& __b)
- { __a.swap(__b); }
-
- template<typename _Tp, _Lock_policy _Lp>
- inline void
- swap(__shared_ptr<_Tp, _Lp>&& __a, __shared_ptr<_Tp, _Lp>& __b)
- { __a.swap(__b); }
-
- template<typename _Tp, _Lock_policy _Lp>
- inline void
- swap(__shared_ptr<_Tp, _Lp>& __a, __shared_ptr<_Tp, _Lp>&& __b)
- { __a.swap(__b); }
-
- // 2.2.3.9 shared_ptr casts
- /** @warning The seemingly equivalent
- * <code>shared_ptr<_Tp, _Lp>(static_cast<_Tp*>(__r.get()))</code>
- * will eventually result in undefined behaviour,
- * attempting to delete the same object twice.
- */
- template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
- inline __shared_ptr<_Tp, _Lp>
- static_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
- { return __shared_ptr<_Tp, _Lp>(__r, static_cast<_Tp*>(__r.get())); }
-
- /** @warning The seemingly equivalent
- * <code>shared_ptr<_Tp, _Lp>(const_cast<_Tp*>(__r.get()))</code>
- * will eventually result in undefined behaviour,
- * attempting to delete the same object twice.
- */
- template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
- inline __shared_ptr<_Tp, _Lp>
- const_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
- { return __shared_ptr<_Tp, _Lp>(__r, const_cast<_Tp*>(__r.get())); }
-
- /** @warning The seemingly equivalent
- * <code>shared_ptr<_Tp, _Lp>(dynamic_cast<_Tp*>(__r.get()))</code>
- * will eventually result in undefined behaviour,
- * attempting to delete the same object twice.
- */
- template<typename _Tp, typename _Tp1, _Lock_policy _Lp>
- inline __shared_ptr<_Tp, _Lp>
- dynamic_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r)
- {
- if (_Tp* __p = dynamic_cast<_Tp*>(__r.get()))
- return __shared_ptr<_Tp, _Lp>(__r, __p);
- return __shared_ptr<_Tp, _Lp>();
- }
-
- // 2.2.3.7 shared_ptr I/O
- template<typename _Ch, typename _Tr, typename _Tp, _Lock_policy _Lp>
- std::basic_ostream<_Ch, _Tr>&
- operator<<(std::basic_ostream<_Ch, _Tr>& __os,
- const __shared_ptr<_Tp, _Lp>& __p)
+ template<typename _Tp1, typename _Tp2>
+ inline bool
+ operator<(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
{
- __os << __p.get();
- return __os;
+ typedef typename std::common_type<_Tp1*, _Tp2*>::type _CT;
+ return std::less<_CT>()(__a.get(), __b.get());
}
- // 2.2.3.10 shared_ptr get_deleter (experimental)
- template<typename _Del, typename _Tp, _Lock_policy _Lp>
- inline _Del*
- get_deleter(const __shared_ptr<_Tp, _Lp>& __p)
- { return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del))); }
-
-
- template<typename _Tp, _Lock_policy _Lp>
- class __weak_ptr
- {
- public:
- typedef _Tp element_type;
-
- __weak_ptr()
- : _M_ptr(0), _M_refcount() // never throws
- { }
-
- // Generated copy constructor, assignment, destructor are fine.
-
- // The "obvious" converting constructor implementation:
- //
- // template<typename _Tp1>
- // __weak_ptr(const __weak_ptr<_Tp1, _Lp>& __r)
- // : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) // never throws
- // { }
- //
- // has a serious problem.
- //
- // __r._M_ptr may already have been invalidated. The _M_ptr(__r._M_ptr)
- // conversion may require access to *__r._M_ptr (virtual inheritance).
- //
- // It is not possible to avoid spurious access violations since
- // in multithreaded programs __r._M_ptr may be invalidated at any point.
- template<typename _Tp1>
- __weak_ptr(const __weak_ptr<_Tp1, _Lp>& __r)
- : _M_refcount(__r._M_refcount) // never throws
- {
- __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
- _M_ptr = __r.lock().get();
- }
-
- template<typename _Tp1>
- __weak_ptr(const __shared_ptr<_Tp1, _Lp>& __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, _Lp>& __r) // never throws
- {
- _M_ptr = __r.lock().get();
- _M_refcount = __r._M_refcount;
- return *this;
- }
-
- template<typename _Tp1>
- __weak_ptr&
- operator=(const __shared_ptr<_Tp1, _Lp>& __r) // never throws
- {
- _M_ptr = __r._M_ptr;
- _M_refcount = __r._M_refcount;
- return *this;
- }
-
- __shared_ptr<_Tp, _Lp>
- lock() const // never throws
- {
-#ifdef __GTHREADS
- // Optimization: avoid throw overhead.
- if (expired())
- return __shared_ptr<element_type, _Lp>();
-
- try
- {
- return __shared_ptr<element_type, _Lp>(*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, _Lp>();
- }
-
-#else
- // Optimization: avoid try/catch overhead when single threaded.
- return expired() ? __shared_ptr<element_type, _Lp>()
- : __shared_ptr<element_type, _Lp>(*this);
-
-#endif
- } // XXX MT
-
- long
- use_count() const // never throws
- { return _M_refcount._M_get_use_count(); }
-
- bool
- expired() const // never throws
- { return _M_refcount._M_get_use_count() == 0; }
-
- template<typename _Tp1>
- bool
- owner_before(const __shared_ptr<_Tp1, _Lp>& __rhs) const
- { return _M_refcount._M_less(__rhs._M_refcount); }
-
- template<typename _Tp1>
- bool
- owner_before(const __weak_ptr<_Tp1, _Lp>& __rhs) const
- { return _M_refcount._M_less(__rhs._M_refcount); }
-
- void
- reset() // never throws
- { __weak_ptr().swap(*this); }
-
- void
- swap(__weak_ptr& __s) // never throws
- {
- std::swap(_M_ptr, __s._M_ptr);
- _M_refcount._M_swap(__s._M_refcount);
- }
-
- // comparisons
- template<typename _Tp1>
- bool operator<(const __weak_ptr<_Tp1, _Lp>&) const = delete;
- template<typename _Tp1>
- bool operator<=(const __weak_ptr<_Tp1, _Lp>&) const = delete;
- template<typename _Tp1>
- bool operator>(const __weak_ptr<_Tp1, _Lp>&) const = delete;
- template<typename _Tp1>
- bool operator>=(const __weak_ptr<_Tp1, _Lp>&) const = delete;
-
- private:
- // Used by __enable_shared_from_this.
- void
- _M_assign(_Tp* __ptr, const __shared_count<_Lp>& __refcount)
- {
- _M_ptr = __ptr;
- _M_refcount = __refcount;
- }
-
- template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
- template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
- friend class __enable_shared_from_this<_Tp, _Lp>;
- friend class enable_shared_from_this<_Tp>;
-
- _Tp* _M_ptr; // Contained pointer.
- __weak_count<_Lp> _M_refcount; // Reference counter.
- };
-
- // 20.8.13.3.7 weak_ptr specialized algorithms.
- template<typename _Tp, _Lock_policy _Lp>
- inline void
- swap(__weak_ptr<_Tp, _Lp>& __a, __weak_ptr<_Tp, _Lp>& __b)
- { __a.swap(__b); }
-
- /// owner_less
- template<typename _Tp> struct owner_less;
-
- template<typename _Tp, typename _Tp1>
- struct _Sp_owner_less : public binary_function<_Tp, _Tp, bool>
- {
- bool
- operator()(const _Tp& __lhs, const _Tp& __rhs) const
- { return __lhs.owner_before(__rhs); }
- bool
- operator()(const _Tp& __lhs, const _Tp1& __rhs) const
- { return __lhs.owner_before(__rhs); }
- bool
- operator()(const _Tp1& __lhs, const _Tp& __rhs) const
- { return __lhs.owner_before(__rhs); }
- };
-
- template<typename _Tp, _Lock_policy _Lp>
- struct owner_less<__shared_ptr<_Tp, _Lp>>
- : public _Sp_owner_less<__shared_ptr<_Tp, _Lp>, __weak_ptr<_Tp, _Lp>>
- { };
-
- template<typename _Tp, _Lock_policy _Lp>
- struct owner_less<__weak_ptr<_Tp, _Lp>>
- : public _Sp_owner_less<__weak_ptr<_Tp, _Lp>, __shared_ptr<_Tp, _Lp>>
- {
- };
-
-
- template<typename _Tp, _Lock_policy _Lp>
- class __enable_shared_from_this
- {
- protected:
- __enable_shared_from_this() { }
-
- __enable_shared_from_this(const __enable_shared_from_this&) { }
-
- __enable_shared_from_this&
- operator=(const __enable_shared_from_this&)
- { return *this; }
-
- ~__enable_shared_from_this() { }
-
- public:
- __shared_ptr<_Tp, _Lp>
- shared_from_this()
- { return __shared_ptr<_Tp, _Lp>(this->_M_weak_this); }
-
- __shared_ptr<const _Tp, _Lp>
- shared_from_this() const
- { return __shared_ptr<const _Tp, _Lp>(this->_M_weak_this); }
-
- private:
- template<typename _Tp1>
- void
- _M_weak_assign(_Tp1* __p, const __shared_count<_Lp>& __n) const
- { _M_weak_this._M_assign(__p, __n); }
-
- template<typename _Tp1>
- friend void
- __enable_shared_from_this_helper(const __shared_count<_Lp>& __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, _Lp> _M_weak_this;
- };
-
-
- /// shared_ptr
- // The actual 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, typename _Deleter, typename _Alloc>
- shared_ptr(_Tp1* __p, _Deleter __d, const _Alloc& __a)
- : __shared_ptr<_Tp>(__p, __d, __a) { }
-
- // Aliasing constructor
- template<typename _Tp1>
- shared_ptr(const shared_ptr<_Tp1>& __r, _Tp* __p)
- : __shared_ptr<_Tp>(__r, __p) { }
-
- template<typename _Tp1>
- shared_ptr(const shared_ptr<_Tp1>& __r)
- : __shared_ptr<_Tp>(__r) { }
-
- shared_ptr(shared_ptr&& __r)
- : __shared_ptr<_Tp>(std::move(__r)) { }
-
- template<typename _Tp1>
- shared_ptr(shared_ptr<_Tp1>&& __r)
- : __shared_ptr<_Tp>(std::move(__r)) { }
-
- template<typename _Tp1>
- explicit
- shared_ptr(const weak_ptr<_Tp1>& __r)
- : __shared_ptr<_Tp>(__r) { }
-
-#if _GLIBCXX_DEPRECATED
- template<typename _Tp1>
- explicit
- shared_ptr(std::auto_ptr<_Tp1>&& __r)
- : __shared_ptr<_Tp>(std::move(__r)) { }
-#endif
-
- template<typename _Tp1, typename _Del>
- explicit
- shared_ptr(const std::unique_ptr<_Tp1, _Del>&) = delete;
-
- template<typename _Tp1, typename _Del>
- explicit
- shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r)
- : __shared_ptr<_Tp>(std::move(__r)) { }
+ inline bool
+ operator<(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return std::less<_Tp*>()(__a.get(), nullptr); }
- template<typename _Tp1>
- shared_ptr&
- operator=(const shared_ptr<_Tp1>& __r) // never throws
- {
- this->__shared_ptr<_Tp>::operator=(__r);
- return *this;
- }
+ template<typename _Tp>
+ inline bool
+ operator<(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return std::less<_Tp*>()(nullptr, __a.get()); }
-#if _GLIBCXX_DEPRECATED
- template<typename _Tp1>
- shared_ptr&
- operator=(std::auto_ptr<_Tp1>&& __r)
- {
- this->__shared_ptr<_Tp>::operator=(std::move(__r));
- return *this;
- }
-#endif
+ template<typename _Tp1, typename _Tp2>
+ inline bool
+ operator<=(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ { return !(__b < __a); }
- shared_ptr&
- operator=(shared_ptr&& __r)
- {
- this->__shared_ptr<_Tp>::operator=(std::move(__r));
- return *this;
- }
-
- template<class _Tp1>
- shared_ptr&
- operator=(shared_ptr<_Tp1>&& __r)
- {
- this->__shared_ptr<_Tp>::operator=(std::move(__r));
- return *this;
- }
+ template<typename _Tp>
+ inline bool
+ operator<=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return !(nullptr < __a); }
- template<typename _Tp1, typename _Del>
- shared_ptr&
- operator=(const std::unique_ptr<_Tp1, _Del>& __r) = delete;
+ template<typename _Tp>
+ inline bool
+ operator<=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return !(__a < nullptr); }
- template<typename _Tp1, typename _Del>
- shared_ptr&
- operator=(std::unique_ptr<_Tp1, _Del>&& __r)
- {
- this->__shared_ptr<_Tp>::operator=(std::move(__r));
- return *this;
- }
+ template<typename _Tp1, typename _Tp2>
+ inline bool
+ operator>(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ { return (__b < __a); }
- private:
- // This constructor is non-standard, it is used by allocate_shared.
- template<typename _Alloc, typename... _Args>
- shared_ptr(_Sp_make_shared_tag __tag, _Alloc __a, _Args&&... __args)
- : __shared_ptr<_Tp>(__tag, __a, std::forward<_Args>(__args)...)
- { }
+ template<typename _Tp>
+ inline bool
+ operator>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return std::less<_Tp*>()(nullptr, __a.get()); }
- template<typename _Tp1, typename _Alloc, typename... _Args>
- friend shared_ptr<_Tp1>
- allocate_shared(_Alloc __a, _Args&&... __args);
- };
+ template<typename _Tp>
+ inline bool
+ operator>(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return std::less<_Tp*>()(__a.get(), nullptr); }
- // 20.8.13.2.7 shared_ptr comparisons
template<typename _Tp1, typename _Tp2>
inline bool
- operator==(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b)
- { return __a.get() == __b.get(); }
+ operator>=(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ { return !(__a < __b); }
- template<typename _Tp1, typename _Tp2>
+ template<typename _Tp>
inline bool
- operator!=(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b)
- { return __a.get() != __b.get(); }
+ operator>=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return !(__a < nullptr); }
- template<typename _Tp1, typename _Tp2>
+ template<typename _Tp>
inline bool
- operator<(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b)
- { return __a.get() < __b.get(); }
+ operator>=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return !(nullptr < __a); }
template<typename _Tp>
- struct less<shared_ptr<_Tp>>
- : public _Sp_less<shared_ptr<_Tp>>
+ struct less<shared_ptr<_Tp>> : public _Sp_less<shared_ptr<_Tp>>
{ };
// 20.8.13.2.9 shared_ptr specialized algorithms.
swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>& __b)
{ __a.swap(__b); }
- template<typename _Tp>
- inline void
- swap(shared_ptr<_Tp>&& __a, shared_ptr<_Tp>& __b)
- { __a.swap(__b); }
-
- template<typename _Tp>
- inline void
- swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>&& __b)
- { __a.swap(__b); }
-
// 20.8.13.2.10 shared_ptr casts.
template<typename _Tp, typename _Tp1>
inline shared_ptr<_Tp>
dynamic_pointer_cast(const shared_ptr<_Tp1>& __r)
{
if (_Tp* __p = dynamic_cast<_Tp*>(__r.get()))
- return shared_ptr<_Tp>(__r, __p);
+ return shared_ptr<_Tp>(__r, __p);
return shared_ptr<_Tp>();
}
- /// weak_ptr
- // The actual weak_ptr, with forwarding constructors and
- // assignment operators.
+ /**
+ * @brief A smart pointer with weak semantics.
+ *
+ * With forwarding constructors and assignment operators.
+ */
template<typename _Tp>
- class weak_ptr
- : public __weak_ptr<_Tp>
+ class weak_ptr : public __weak_ptr<_Tp>
{
public:
- weak_ptr()
+ constexpr weak_ptr()
: __weak_ptr<_Tp>() { }
-
- template<typename _Tp1>
- weak_ptr(const weak_ptr<_Tp1>& __r)
+
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ weak_ptr(const weak_ptr<_Tp1>& __r)
: __weak_ptr<_Tp>(__r) { }
- template<typename _Tp1>
- weak_ptr(const shared_ptr<_Tp1>& __r)
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ weak_ptr(const shared_ptr<_Tp1>& __r)
: __weak_ptr<_Tp>(__r) { }
template<typename _Tp1>
- weak_ptr&
- operator=(const weak_ptr<_Tp1>& __r) // never throws
- {
+ 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
- {
+ weak_ptr&
+ operator=(const shared_ptr<_Tp1>& __r) // never throws
+ {
this->__weak_ptr<_Tp>::operator=(__r);
return *this;
}
if (this->expired())
return shared_ptr<_Tp>();
- try
+ __try
{
return shared_ptr<_Tp>(*this);
}
- catch(const bad_weak_ptr&)
+ __catch(const bad_weak_ptr&)
{
return shared_ptr<_Tp>();
}
#else
- return this->expired() ? shared_ptr<_Tp>()
- : shared_ptr<_Tp>(*this);
+ return this->expired() ? shared_ptr<_Tp>() : shared_ptr<_Tp>(*this);
#endif
}
-
- // comparisons
- template<typename _Tp1>
- bool operator<(const weak_ptr<_Tp1>&) const = delete;
- template<typename _Tp1>
- bool operator<=(const weak_ptr<_Tp1>&) const = delete;
- template<typename _Tp1>
- bool operator>(const weak_ptr<_Tp1>&) const = delete;
- template<typename _Tp1>
- bool operator>=(const weak_ptr<_Tp1>&) const = delete;
};
// 20.8.13.3.7 weak_ptr specialized algorithms.
swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b)
{ __a.swap(__b); }
- /// owner_less
+
+ /// Primary template owner_less
+ template<typename _Tp>
+ struct owner_less;
+
+ /// Partial specialization of owner_less for shared_ptr.
template<typename _Tp>
struct owner_less<shared_ptr<_Tp>>
: public _Sp_owner_less<shared_ptr<_Tp>, weak_ptr<_Tp>>
{ };
+ /// Partial specialization of owner_less for weak_ptr.
template<typename _Tp>
struct owner_less<weak_ptr<_Tp>>
: public _Sp_owner_less<weak_ptr<_Tp>, shared_ptr<_Tp>>
{ };
- /// enable_shared_from_this
+ /**
+ * @brief Base class allowing use of member function shared_from_this.
+ */
template<typename _Tp>
class enable_shared_from_this
{
protected:
- enable_shared_from_this() { }
-
+ constexpr enable_shared_from_this() { }
+
enable_shared_from_this(const enable_shared_from_this&) { }
enable_shared_from_this&
private:
template<typename _Tp1>
- void
- _M_weak_assign(_Tp1* __p, const __shared_count<>& __n) const
- { _M_weak_this._M_assign(__p, __n); }
+ void
+ _M_weak_assign(_Tp1* __p, const __shared_count<>& __n) const
+ { _M_weak_this._M_assign(__p, __n); }
template<typename _Tp1>
- friend void
- __enable_shared_from_this_helper(const __shared_count<>& __pn,
+ friend void
+ __enable_shared_from_this_helper(const __shared_count<>& __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;
};
- template<typename _Tp, _Lock_policy _Lp, typename _Alloc, typename... _Args>
- inline __shared_ptr<_Tp, _Lp>
- __allocate_shared(_Alloc __a, _Args&&... __args)
- {
- return __shared_ptr<_Tp, _Lp>(_Sp_make_shared_tag(),
- std::forward<_Alloc>(__a), std::forward<_Args>(__args)...);
- }
-
- template<typename _Tp, _Lock_policy _Lp, typename... _Args>
- inline __shared_ptr<_Tp, _Lp>
- __make_shared(_Args&&... __args)
- {
- typedef typename std::remove_const<_Tp>::type _Tp_nc;
- return __allocate_shared<_Tp, _Lp>(std::allocator<_Tp_nc>(),
- std::forward<_Args>(__args)...);
- }
-
- /** @brief Create an object that is owned by a shared_ptr.
+ /**
+ * @brief Create an object that is owned by a shared_ptr.
* @param __a An allocator.
* @param __args Arguments for the @a _Tp object's constructor.
* @return A shared_ptr that owns the newly created object.
*/
template<typename _Tp, typename _Alloc, typename... _Args>
inline shared_ptr<_Tp>
- allocate_shared(_Alloc __a, _Args&&... __args)
+ allocate_shared(const _Alloc& __a, _Args&&... __args)
{
- return shared_ptr<_Tp>(_Sp_make_shared_tag(), std::forward<_Alloc>(__a),
- std::forward<_Args>(__args)...);
+ return shared_ptr<_Tp>(_Sp_make_shared_tag(), __a,
+ std::forward<_Args>(__args)...);
}
- /** @brief Create an object that is owned by a shared_ptr.
+ /**
+ * @brief Create an object that is owned by a shared_ptr.
* @param __args Arguments for the @a _Tp object's constructor.
* @return A shared_ptr that owns the newly created object.
* @throw std::bad_alloc, or an exception thrown from the
{
typedef typename std::remove_const<_Tp>::type _Tp_nc;
return allocate_shared<_Tp>(std::allocator<_Tp_nc>(),
- std::forward<_Args>(__args)...);
+ std::forward<_Args>(__args)...);
}
-}
+ /// std::hash specialization for shared_ptr.
+ template<typename _Tp>
+ struct hash<shared_ptr<_Tp>>
+ : public std::unary_function<shared_ptr<_Tp>, size_t>
+ {
+ size_t
+ operator()(const shared_ptr<_Tp>& __s) const
+ { return std::hash<_Tp*>()(__s.get()); }
+ };
+
+ // @} group pointer_abstractions
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif // _SHARED_PTR_H
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