diff options
Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/bits/shared_ptr.h')
| -rw-r--r-- | gcc-4.4.3/libstdc++-v3/include/bits/shared_ptr.h | 1571 |
1 files changed, 0 insertions, 1571 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/bits/shared_ptr.h b/gcc-4.4.3/libstdc++-v3/include/bits/shared_ptr.h deleted file mode 100644 index e8cd8ea99..000000000 --- a/gcc-4.4.3/libstdc++-v3/include/bits/shared_ptr.h +++ /dev/null @@ -1,1571 +0,0 @@ -// shared_ptr and weak_ptr implementation -*- C++ -*- - -// Copyright (C) 2007, 2008, 2009 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 3, or (at your option) -// any later version. - -// This library is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. - -// 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. - -// 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/>. - -// shared_count.hpp -// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. - -// shared_ptr.hpp -// Copyright (C) 1998, 1999 Greg Colvin and Beman Dawes. -// Copyright (C) 2001, 2002, 2003 Peter Dimov - -// weak_ptr.hpp -// Copyright (C) 2001, 2002, 2003 Peter Dimov - -// enable_shared_from_this.hpp -// Copyright (C) 2002 Peter Dimov - -// Distributed under the Boost Software License, Version 1.0. (See -// 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. - */ - -#ifndef _SHARED_PTR_H -#define _SHARED_PTR_H 1 - -#ifndef __GXX_EXPERIMENTAL_CXX0X__ -# include <c++0x_warning.h> -#endif - -#if defined(_GLIBCXX_INCLUDE_AS_TR1) -# error C++0x header cannot be included from TR1 header -#endif - -_GLIBCXX_BEGIN_NAMESPACE(std) - - /** - * @addtogroup pointer_abstractions - * @{ - */ - - // 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 - }; - - // 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 { }; - - template<typename _Tp, typename _Alloc, _Lock_policy _Lp> - class _Sp_counted_ptr_inplace - : public _Sp_counted_deleter<_Tp*, _Sp_destroy_inplace<_Tp>, _Alloc, _Lp> - { - 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; - - template<_Lock_policy _Lp = __default_lock_policy> - class __shared_count - { - 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(); } -#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>&, ...) - { } - - - template<typename _Tp, _Lock_policy _Lp> - class __shared_ptr - { - public: - typedef _Tp element_type; - - /** @brief Construct an empty %__shared_ptr. - * @post use_count()==0 && get()==0 - */ - __shared_ptr() - : _M_ptr(0), _M_refcount() // never throws - { } - - /** @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); - } - - // - // 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 - * 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. - */ - 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 - * 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. - */ - 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); - } - - /** @brief Constructs a %__shared_ptr instance that stores @a __p - * and shares ownership with @a __r. - * @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() - * - * This can be used to construct a @c shared_ptr to a sub-object - * of an object managed by an existing @c shared_ptr. - * - * @code - * shared_ptr< pair<int,int> > pii(new pair<int,int>()); - * shared_ptr<int> pi(pii, &pii->first); - * assert(pii.use_count() == 2); - * @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 - * with @a __r. - * @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*>) } - - /** @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; - } - - /** @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 - * and stores a copy of the pointer stored in @a __r. - * @param __r A weak_ptr. - * @post use_count() == __r.use_count() - * @throw bad_weak_ptr when __r.expired(), - * 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; - } - - template<typename _Tp1, typename _Del> - explicit - __shared_ptr(const std::unique_ptr<_Tp1, _Del>&) = delete; - - /** - * 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); - } - -#if _GLIBCXX_DEPRECATED - /** - * @post use_count() == 1 and __r.get() == 0 - */ - 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 - - 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 - return *this; - } - -#if _GLIBCXX_DEPRECATED - template<typename _Tp1> - __shared_ptr& - operator=(std::auto_ptr<_Tp1>&& __r) - { - __shared_ptr(std::move(__r)).swap(*this); - return *this; - } -#endif - - __shared_ptr& - operator=(__shared_ptr&& __r) - { - __shared_ptr(std::move(__r)).swap(*this); - 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<typename _Tp1, typename _Del> - __shared_ptr& - operator=(std::unique_ptr<_Tp1, _Del>&& __r) - { - __shared_ptr(std::move(__r)).swap(*this); - 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; - - 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. - }; - - // 20.8.13.2.7 shared_ptr comparisons - template<typename _Tp1, typename _Tp2, _Lock_policy _Lp> - inline bool - operator==(const __shared_ptr<_Tp1, _Lp>& __a, - const __shared_ptr<_Tp2, _Lp>& __b) - { return __a.get() == __b.get(); } - - template<typename _Tp1, typename _Tp2, _Lock_policy _Lp> - inline bool - operator!=(const __shared_ptr<_Tp1, _Lp>& __a, - const __shared_ptr<_Tp2, _Lp>& __b) - { return __a.get() != __b.get(); } - - template<typename _Tp1, typename _Tp2, _Lock_policy _Lp> - 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>> - { }; - - // XXX LessThanComparable<_Tp> concept should provide >, >= and <= - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator>(const __shared_ptr<_Tp, _Lp>& __a, - const __shared_ptr<_Tp, _Lp>& __b) - { return __a.get() > __b.get(); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator>=(const __shared_ptr<_Tp, _Lp>& __a, - const __shared_ptr<_Tp, _Lp>& __b) - { return __a.get() >= __b.get(); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator<=(const __shared_ptr<_Tp, _Lp>& __a, - const __shared_ptr<_Tp, _Lp>& __b) - { return __a.get() <= __b.get(); } - - // 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); } - - // 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) - { - __os << __p.get(); - return __os; - } - - // 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; - }; - - /** - * @brief 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> - 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)) { } - - template<typename _Tp1> - shared_ptr& - operator=(const shared_ptr<_Tp1>& __r) // never throws - { - this->__shared_ptr<_Tp>::operator=(__r); - return *this; - } - -#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 - - 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 _Tp1, typename _Del> - shared_ptr& - operator=(const std::unique_ptr<_Tp1, _Del>& __r) = delete; - - template<typename _Tp1, typename _Del> - shared_ptr& - operator=(std::unique_ptr<_Tp1, _Del>&& __r) - { - this->__shared_ptr<_Tp>::operator=(std::move(__r)); - return *this; - } - - 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 _Tp1, typename _Alloc, typename... _Args> - friend shared_ptr<_Tp1> - allocate_shared(_Alloc __a, _Args&&... __args); - }; - - // 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(); } - - template<typename _Tp1, typename _Tp2> - inline bool - operator!=(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b) - { return __a.get() != __b.get(); } - - template<typename _Tp1, typename _Tp2> - inline bool - operator<(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b) - { return __a.get() < __b.get(); } - - template<typename _Tp> - struct less<shared_ptr<_Tp>> - : public _Sp_less<shared_ptr<_Tp>> - { }; - - // 20.8.13.2.9 shared_ptr specialized algorithms. - 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> - static_pointer_cast(const shared_ptr<_Tp1>& __r) - { return shared_ptr<_Tp>(__r, static_cast<_Tp*>(__r.get())); } - - template<typename _Tp, typename _Tp1> - inline shared_ptr<_Tp> - const_pointer_cast(const shared_ptr<_Tp1>& __r) - { return shared_ptr<_Tp>(__r, const_cast<_Tp*>(__r.get())); } - - 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>(); - } - - - /** - * @brief A smart pointer with weak semantics. - * - * 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; - } - - shared_ptr<_Tp> - lock() const // never throws - { -#ifdef __GTHREADS - if (this->expired()) - return shared_ptr<_Tp>(); - - __try - { - return shared_ptr<_Tp>(*this); - } - __catch(const bad_weak_ptr&) - { - return shared_ptr<_Tp>(); - } -#else - 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. - template<typename _Tp> - inline void - swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b) - { __a.swap(__b); } - - /// owner_less - template<typename _Tp> - struct owner_less<shared_ptr<_Tp>> - : public _Sp_owner_less<shared_ptr<_Tp>, weak_ptr<_Tp>> - { }; - - template<typename _Tp> - struct owner_less<weak_ptr<_Tp>> - : public _Sp_owner_less<weak_ptr<_Tp>, shared_ptr<_Tp>> - { }; - - /** - * @brief Base class allowing use of member function shared_from_this. - */ - template<typename _Tp> - 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> - shared_from_this() - { return shared_ptr<_Tp>(this->_M_weak_this); } - - shared_ptr<const _Tp> - shared_from_this() const - { return shared_ptr<const _Tp>(this->_M_weak_this); } - - private: - template<typename _Tp1> - 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, - 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. - * @param __a An allocator. - * @param __args Arguments for the @a _Tp object's constructor. - * @return A shared_ptr that owns the newly created object. - * @throw An exception thrown from @a _Alloc::allocate or from the - * constructor of @a _Tp. - * - * A copy of @a __a will be used to allocate memory for the shared_ptr - * and the new object. - */ - template<typename _Tp, typename _Alloc, typename... _Args> - inline shared_ptr<_Tp> - allocate_shared(_Alloc __a, _Args&&... __args) - { - return shared_ptr<_Tp>(_Sp_make_shared_tag(), std::forward<_Alloc>(__a), - std::forward<_Args>(__args)...); - } - - /** @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 - * constructor of @a _Tp. - */ - template<typename _Tp, typename... _Args> - inline shared_ptr<_Tp> - make_shared(_Args&&... __args) - { - typedef typename std::remove_const<_Tp>::type _Tp_nc; - return allocate_shared<_Tp>(std::allocator<_Tp_nc>(), - std::forward<_Args>(__args)...); - } - - // @} group pointer_abstractions - -_GLIBCXX_END_NAMESPACE - -#endif // _SHARED_PTR_H |