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algorithmfwd.h
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allocator.h
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atomic_0.h
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atomic_2.h
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atomicfwd_c.h
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atomicfwd_cxx.h
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basic_ios.h
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basic_ios.tcc
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basic_string.h
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basic_string.tcc
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boost_concept_check.h
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char_traits.h
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cmath.tcc
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codecvt.h
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concept_check.h
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cpp_type_traits.h
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deque.tcc
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forward_list.h
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forward_list.tcc
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fstream.tcc
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functexcept.h
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functional_hash.h
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gslice.h
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gslice_array.h
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hashtable.h
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indirect_array.h
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ios_base.h
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istream.tcc
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list.tcc
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locale_classes.h
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locale_classes.tcc
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locale_facets.h
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locale_facets.tcc
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locale_facets_nonio.h
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locale_facets_nonio.tcc
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localefwd.h
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mask_array.h
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move.h
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ostream.tcc
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ostream_insert.h
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postypes.h
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shared_ptr.h
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slice_array.h
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sstream.tcc
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stl_algo.h
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stl_algobase.h
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stl_bvector.h
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stl_construct.h
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stl_deque.h
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stl_function.h
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stl_heap.h
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stl_iterator.h
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stl_iterator_base_funcs.h
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stl_iterator_base_types.h
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stl_list.h
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stl_map.h
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stl_multimap.h
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stl_multiset.h
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stl_numeric.h
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stl_pair.h
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stl_queue.h
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stl_raw_storage_iter.h
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stl_relops.h
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stl_set.h
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stl_stack.h
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stl_tempbuf.h
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stl_tree.h
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stl_uninitialized.h
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stl_vector.h
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stream_iterator.h
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streambuf.tcc
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streambuf_iterator.h
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stringfwd.h
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unique_ptr.h
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valarray_after.h
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valarray_array.h
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valarray_array.tcc
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valarray_before.h
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vector.tcc
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Editing: shared_ptr.h
// 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); } 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) { __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); } 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> 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
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