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Diffstat (limited to 'gcc-4.8.1/libstdc++-v3/include/bits/shared_ptr_base.h')
| -rw-r--r-- | gcc-4.8.1/libstdc++-v3/include/bits/shared_ptr_base.h | 1453 |
1 files changed, 0 insertions, 1453 deletions
diff --git a/gcc-4.8.1/libstdc++-v3/include/bits/shared_ptr_base.h b/gcc-4.8.1/libstdc++-v3/include/bits/shared_ptr_base.h deleted file mode 100644 index c5df1fbca..000000000 --- a/gcc-4.8.1/libstdc++-v3/include/bits/shared_ptr_base.h +++ /dev/null @@ -1,1453 +0,0 @@ -// shared_ptr and weak_ptr implementation details -*- C++ -*- - -// Copyright (C) 2007-2013 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/>. - -// 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. - -// 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) - -/** @file bits/shared_ptr_base.h - * This is an internal header file, included by other library headers. - * Do not attempt to use it directly. @headername{memory} - */ - -#ifndef _SHARED_PTR_BASE_H -#define _SHARED_PTR_BASE_H 1 - -namespace std _GLIBCXX_VISIBILITY(default) -{ -_GLIBCXX_BEGIN_NAMESPACE_VERSION - -#if _GLIBCXX_USE_DEPRECATED - template<typename> class auto_ptr; -#endif - - /** - * @brief Exception possibly thrown by @c shared_ptr. - * @ingroup exceptions - */ - class bad_weak_ptr : public std::exception - { - public: - virtual char const* - what() const noexcept; - - virtual ~bad_weak_ptr() noexcept; - }; - - // Substitute for bad_weak_ptr object in the case of -fno-exceptions. - inline void - __throw_bad_weak_ptr() - { _GLIBCXX_THROW_OR_ABORT(bad_weak_ptr()); } - - using __gnu_cxx::_Lock_policy; - using __gnu_cxx::__default_lock_policy; - using __gnu_cxx::_S_single; - using __gnu_cxx::_S_mutex; - using __gnu_cxx::_S_atomic; - - // Empty helper class except when the template argument is _S_mutex. - template<_Lock_policy _Lp> - class _Mutex_base - { - protected: - // The atomic policy uses fully-fenced builtins, single doesn't care. - enum { _S_need_barriers = 0 }; - }; - - template<> - class _Mutex_base<_S_mutex> - : public __gnu_cxx::__mutex - { - protected: - // This policy is used when atomic builtins are not available. - // The replacement atomic operations might not have the necessary - // memory barriers. - enum { _S_need_barriers = 1 }; - }; - - template<_Lock_policy _Lp = __default_lock_policy> - class _Sp_counted_base - : public _Mutex_base<_Lp> - { - public: - _Sp_counted_base() noexcept - : _M_use_count(1), _M_weak_count(1) { } - - virtual - ~_Sp_counted_base() noexcept - { } - - // Called when _M_use_count drops to zero, to release the resources - // managed by *this. - virtual void - _M_dispose() noexcept = 0; - - // Called when _M_weak_count drops to zero. - virtual void - _M_destroy() noexcept - { delete this; } - - virtual void* - _M_get_deleter(const std::type_info&) = 0; - - void - _M_add_ref_copy() - { __gnu_cxx::__atomic_add_dispatch(&_M_use_count, 1); } - - void - _M_add_ref_lock(); - - void - _M_release() noexcept - { - // Be race-detector-friendly. For more info see bits/c++config. - _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_use_count); - if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, -1) == 1) - { - _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_use_count); - _M_dispose(); - // There must be a memory barrier between dispose() and destroy() - // to ensure that the effects of dispose() are observed in the - // thread that runs destroy(). - // See http://gcc.gnu.org/ml/libstdc++/2005-11/msg00136.html - if (_Mutex_base<_Lp>::_S_need_barriers) - { - _GLIBCXX_READ_MEM_BARRIER; - _GLIBCXX_WRITE_MEM_BARRIER; - } - - // Be race-detector-friendly. For more info see bits/c++config. - _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_weak_count); - if (__gnu_cxx::__exchange_and_add_dispatch(&_M_weak_count, - -1) == 1) - { - _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_weak_count); - _M_destroy(); - } - } - } - - void - _M_weak_add_ref() noexcept - { __gnu_cxx::__atomic_add_dispatch(&_M_weak_count, 1); } - - void - _M_weak_release() noexcept - { - // Be race-detector-friendly. For more info see bits/c++config. - _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_weak_count); - if (__gnu_cxx::__exchange_and_add_dispatch(&_M_weak_count, -1) == 1) - { - _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_weak_count); - if (_Mutex_base<_Lp>::_S_need_barriers) - { - // See _M_release(), - // destroy() must observe results of dispose() - _GLIBCXX_READ_MEM_BARRIER; - _GLIBCXX_WRITE_MEM_BARRIER; - } - _M_destroy(); - } - } - - long - _M_get_use_count() const noexcept - { - // No memory barrier is used here so there is no synchronization - // with other threads. - return __atomic_load_n(&_M_use_count, __ATOMIC_RELAXED); - } - - private: - _Sp_counted_base(_Sp_counted_base const&) = delete; - _Sp_counted_base& operator=(_Sp_counted_base const&) = delete; - - _Atomic_word _M_use_count; // #shared - _Atomic_word _M_weak_count; // #weak + (#shared != 0) - }; - - template<> - inline void - _Sp_counted_base<_S_single>:: - _M_add_ref_lock() - { - if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, 1) == 0) - { - _M_use_count = 0; - __throw_bad_weak_ptr(); - } - } - - template<> - inline void - _Sp_counted_base<_S_mutex>:: - _M_add_ref_lock() - { - __gnu_cxx::__scoped_lock sentry(*this); - if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, 1) == 0) - { - _M_use_count = 0; - __throw_bad_weak_ptr(); - } - } - - template<> - inline void - _Sp_counted_base<_S_atomic>:: - _M_add_ref_lock() - { - // Perform lock-free add-if-not-zero operation. - _Atomic_word __count = _M_use_count; - do - { - if (__count == 0) - __throw_bad_weak_ptr(); - // Replace the current counter value with the old value + 1, as - // long as it's not changed meanwhile. - } - while (!__atomic_compare_exchange_n(&_M_use_count, &__count, __count + 1, - true, __ATOMIC_ACQ_REL, - __ATOMIC_RELAXED)); - } - - - // 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> - struct owner_less; - - template<typename _Tp> - class enable_shared_from_this; - - template<_Lock_policy _Lp = __default_lock_policy> - class __weak_count; - - template<_Lock_policy _Lp = __default_lock_policy> - class __shared_count; - - - // Counted ptr with no deleter or allocator support - template<typename _Ptr, _Lock_policy _Lp> - class _Sp_counted_ptr final : public _Sp_counted_base<_Lp> - { - public: - explicit - _Sp_counted_ptr(_Ptr __p) - : _M_ptr(__p) { } - - virtual void - _M_dispose() noexcept - { delete _M_ptr; } - - virtual void - _M_destroy() noexcept - { delete this; } - - virtual void* - _M_get_deleter(const std::type_info&) - { 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 - }; - - template<> - inline void - _Sp_counted_ptr<nullptr_t, _S_single>::_M_dispose() noexcept { } - - template<> - inline void - _Sp_counted_ptr<nullptr_t, _S_mutex>::_M_dispose() noexcept { } - - template<> - inline void - _Sp_counted_ptr<nullptr_t, _S_atomic>::_M_dispose() noexcept { } - - // Support for custom deleter and/or allocator - template<typename _Ptr, typename _Deleter, typename _Alloc, _Lock_policy _Lp> - class _Sp_counted_deleter final : public _Sp_counted_base<_Lp> - { - // 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 _Alloc // copy constructor must not throw - { - _Deleter _M_del; // copy constructor must not throw - _My_Deleter(_Deleter __d, const _Alloc& __a) - : _Alloc(__a), _M_del(__d) { } - }; - - public: - // __d(__p) must not throw. - _Sp_counted_deleter(_Ptr __p, _Deleter __d) - : _M_ptr(__p), _M_del(__d, _Alloc()) { } - - // __d(__p) must not throw. - _Sp_counted_deleter(_Ptr __p, _Deleter __d, const _Alloc& __a) - : _M_ptr(__p), _M_del(__d, __a) { } - - ~_Sp_counted_deleter() noexcept { } - - virtual void - _M_dispose() noexcept - { _M_del._M_del(_M_ptr); } - - virtual void - _M_destroy() noexcept - { - typedef typename allocator_traits<_Alloc>::template - rebind_traits<_Sp_counted_deleter> _Alloc_traits; - typename _Alloc_traits::allocator_type __a(_M_del); - _Alloc_traits::destroy(__a, this); - _Alloc_traits::deallocate(__a, this, 1); - } - - virtual void* - _M_get_deleter(const std::type_info& __ti) - { -#ifdef __GXX_RTTI - return __ti == typeid(_Deleter) ? &_M_del._M_del : 0; -#else - return 0; -#endif - } - - protected: - _Ptr _M_ptr; // copy constructor must not throw - _My_Deleter _M_del; // copy constructor must not throw - }; - - // helpers for make_shared / allocate_shared - - struct _Sp_make_shared_tag { }; - - template<typename _Tp, typename _Alloc, _Lock_policy _Lp> - class _Sp_counted_ptr_inplace final : public _Sp_counted_base<_Lp> - { - // Helper class that stores the pointer 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 _Impl - : public _Alloc // copy constructor must not throw - { - _Impl(_Alloc __a) : _Alloc(__a), _M_ptr() { } - _Tp* _M_ptr; - }; - - public: - template<typename... _Args> - _Sp_counted_ptr_inplace(_Alloc __a, _Args&&... __args) - : _M_impl(__a), _M_storage() - { - _M_impl._M_ptr = static_cast<_Tp*>(static_cast<void*>(&_M_storage)); - // _GLIBCXX_RESOLVE_LIB_DEFECTS - // 2070. allocate_shared should use allocator_traits<A>::construct - allocator_traits<_Alloc>::construct(__a, _M_impl._M_ptr, - std::forward<_Args>(__args)...); // might throw - } - - ~_Sp_counted_ptr_inplace() noexcept { } - - virtual void - _M_dispose() noexcept - { allocator_traits<_Alloc>::destroy(_M_impl, _M_impl._M_ptr); } - - // Override because the allocator needs to know the dynamic type - virtual void - _M_destroy() noexcept - { - typedef typename allocator_traits<_Alloc>::template - rebind_traits<_Sp_counted_ptr_inplace> _Alloc_traits; - typename _Alloc_traits::allocator_type __a(_M_impl); - _Alloc_traits::destroy(__a, this); - _Alloc_traits::deallocate(__a, this, 1); - } - - // Sneaky trick so __shared_ptr can get the managed pointer - virtual void* - _M_get_deleter(const std::type_info& __ti) noexcept - { -#ifdef __GXX_RTTI - return __ti == typeid(_Sp_make_shared_tag) - ? static_cast<void*>(&_M_storage) - : 0; -#else - return 0; -#endif - } - - private: - _Impl _M_impl; - typename aligned_storage<sizeof(_Tp), alignment_of<_Tp>::value>::type - _M_storage; - }; - - template<_Lock_policy _Lp> - class __shared_count - { - public: - constexpr __shared_count() noexcept : _M_pi(0) - { } - - template<typename _Ptr> - explicit - __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) - { - // The 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 typename allocator_traits<_Alloc>::template - rebind_traits<_Sp_cd_type> _Alloc_traits; - typename _Alloc_traits::allocator_type __a; - _Sp_cd_type* __mem = 0; - __try - { - __mem = _Alloc_traits::allocate(__a, 1); - _Alloc_traits::construct(__a, __mem, __p, std::move(__d)); - _M_pi = __mem; - } - __catch(...) - { - __d(__p); // Call _Deleter on __p. - if (__mem) - _Alloc_traits::deallocate(__a, __mem, 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 allocator_traits<_Alloc>::template - rebind_traits<_Sp_cd_type> _Alloc_traits; - typename _Alloc_traits::allocator_type __a2(__a); - _Sp_cd_type* __mem = 0; - __try - { - __mem = _Alloc_traits::allocate(__a2, 1); - _Alloc_traits::construct(__a2, __mem, - __p, std::move(__d), std::move(__a)); - _M_pi = __mem; - } - __catch(...) - { - __d(__p); // Call _Deleter on __p. - if (__mem) - _Alloc_traits::deallocate(__a2, __mem, 1); - __throw_exception_again; - } - } - - template<typename _Tp, typename _Alloc, typename... _Args> - __shared_count(_Sp_make_shared_tag, _Tp*, const _Alloc& __a, - _Args&&... __args) - : _M_pi(0) - { - typedef _Sp_counted_ptr_inplace<_Tp, _Alloc, _Lp> _Sp_cp_type; - typedef typename allocator_traits<_Alloc>::template - rebind_traits<_Sp_cp_type> _Alloc_traits; - typename _Alloc_traits::allocator_type __a2(__a); - _Sp_cp_type* __mem = _Alloc_traits::allocate(__a2, 1); - __try - { - _Alloc_traits::construct(__a2, __mem, std::move(__a), - std::forward<_Args>(__args)...); - _M_pi = __mem; - } - __catch(...) - { - _Alloc_traits::deallocate(__a2, __mem, 1); - __throw_exception_again; - } - } - -#if _GLIBCXX_USE_DEPRECATED - // Special case for auto_ptr<_Tp> to provide the strong guarantee. - template<typename _Tp> - explicit - __shared_count(std::auto_ptr<_Tp>&& __r); -#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() noexcept - { - if (_M_pi != 0) - _M_pi->_M_release(); - } - - __shared_count(const __shared_count& __r) noexcept - : _M_pi(__r._M_pi) - { - if (_M_pi != 0) - _M_pi->_M_add_ref_copy(); - } - - __shared_count& - operator=(const __shared_count& __r) noexcept - { - _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) noexcept - { - _Sp_counted_base<_Lp>* __tmp = __r._M_pi; - __r._M_pi = _M_pi; - _M_pi = __tmp; - } - - long - _M_get_use_count() const noexcept - { return _M_pi != 0 ? _M_pi->_M_get_use_count() : 0; } - - bool - _M_unique() const noexcept - { return this->_M_get_use_count() == 1; } - - void* - _M_get_deleter(const std::type_info& __ti) const noexcept - { return _M_pi ? _M_pi->_M_get_deleter(__ti) : 0; } - - bool - _M_less(const __shared_count& __rhs) const noexcept - { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); } - - bool - _M_less(const __weak_count<_Lp>& __rhs) const noexcept - { 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) noexcept - { 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) - { - typedef typename unique_ptr<_Tp, _Del>::pointer _Ptr; - return new _Sp_counted_deleter<_Ptr, _Del, std::allocator<void>, - _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 unique_ptr<_Tp, _Del>::pointer _Ptr; - typedef typename std::remove_reference<_Del>::type _Del1; - typedef std::reference_wrapper<_Del1> _Del2; - return new _Sp_counted_deleter<_Ptr, _Del2, std::allocator<void>, - _Lp>(__r.get(), std::ref(__r.get_deleter())); - } - - _Sp_counted_base<_Lp>* _M_pi; - }; - - - template<_Lock_policy _Lp> - class __weak_count - { - public: - constexpr __weak_count() noexcept : _M_pi(0) - { } - - __weak_count(const __shared_count<_Lp>& __r) noexcept - : _M_pi(__r._M_pi) - { - if (_M_pi != 0) - _M_pi->_M_weak_add_ref(); - } - - __weak_count(const __weak_count<_Lp>& __r) noexcept - : _M_pi(__r._M_pi) - { - if (_M_pi != 0) - _M_pi->_M_weak_add_ref(); - } - - ~__weak_count() noexcept - { - if (_M_pi != 0) - _M_pi->_M_weak_release(); - } - - __weak_count<_Lp>& - operator=(const __shared_count<_Lp>& __r) noexcept - { - _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) noexcept - { - _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) noexcept - { - _Sp_counted_base<_Lp>* __tmp = __r._M_pi; - __r._M_pi = _M_pi; - _M_pi = __tmp; - } - - long - _M_get_use_count() const noexcept - { return _M_pi != 0 ? _M_pi->_M_get_use_count() : 0; } - - bool - _M_less(const __weak_count& __rhs) const noexcept - { return std::less<_Sp_counted_base<_Lp>*>()(this->_M_pi, __rhs._M_pi); } - - bool - _M_less(const __shared_count<_Lp>& __rhs) const noexcept - { 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) noexcept - { 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(); - } - - - // 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*) noexcept; - - // 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*) noexcept; - - template<_Lock_policy _Lp> - inline void - __enable_shared_from_this_helper(const __shared_count<_Lp>&, ...) noexcept - { } - - - template<typename _Tp, _Lock_policy _Lp> - class __shared_ptr - { - public: - typedef _Tp element_type; - - constexpr __shared_ptr() noexcept - : _M_ptr(0), _M_refcount() - { } - - template<typename _Tp1> - explicit __shared_ptr(_Tp1* __p) - : _M_ptr(__p), _M_refcount(__p) - { - __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) - static_assert( sizeof(_Tp1) > 0, "incomplete type" ); - __enable_shared_from_this_helper(_M_refcount, __p, __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); - } - - template<typename _Tp1, typename _Deleter, typename _Alloc> - __shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a) - : _M_ptr(__p), _M_refcount(__p, __d, std::move(__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); - } - - template<typename _Deleter> - __shared_ptr(nullptr_t __p, _Deleter __d) - : _M_ptr(0), _M_refcount(__p, __d) - { } - - template<typename _Deleter, typename _Alloc> - __shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a) - : _M_ptr(0), _M_refcount(__p, __d, std::move(__a)) - { } - - template<typename _Tp1> - __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r, _Tp* __p) noexcept - : _M_ptr(__p), _M_refcount(__r._M_refcount) // never throws - { } - - __shared_ptr(const __shared_ptr&) noexcept = default; - __shared_ptr& operator=(const __shared_ptr&) noexcept = default; - ~__shared_ptr() = default; - - template<typename _Tp1, typename = typename - std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type> - __shared_ptr(const __shared_ptr<_Tp1, _Lp>& __r) noexcept - : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) - { } - - __shared_ptr(__shared_ptr&& __r) noexcept - : _M_ptr(__r._M_ptr), _M_refcount() - { - _M_refcount._M_swap(__r._M_refcount); - __r._M_ptr = 0; - } - - template<typename _Tp1, typename = typename - std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type> - __shared_ptr(__shared_ptr<_Tp1, _Lp>&& __r) noexcept - : _M_ptr(__r._M_ptr), _M_refcount() - { - _M_refcount._M_swap(__r._M_refcount); - __r._M_ptr = 0; - } - - 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; - } - - // If an exception is thrown this constructor has no effect. - template<typename _Tp1, typename _Del> - __shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r) - : _M_ptr(__r.get()), _M_refcount() - { - __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>) - auto __tmp = std::__addressof(*__r.get()); - _M_refcount = __shared_count<_Lp>(std::move(__r)); - __enable_shared_from_this_helper(_M_refcount, __tmp, __tmp); - } - -#if _GLIBCXX_USE_DEPRECATED - // Postcondition: use_count() == 1 and __r.get() == 0 - template<typename _Tp1> - __shared_ptr(std::auto_ptr<_Tp1>&& __r); -#endif - - /* TODO: use delegating constructor */ - constexpr __shared_ptr(nullptr_t) noexcept - : _M_ptr(0), _M_refcount() - { } - - template<typename _Tp1> - __shared_ptr& - operator=(const __shared_ptr<_Tp1, _Lp>& __r) noexcept - { - _M_ptr = __r._M_ptr; - _M_refcount = __r._M_refcount; // __shared_count::op= doesn't throw - return *this; - } - -#if _GLIBCXX_USE_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) noexcept - { - __shared_ptr(std::move(__r)).swap(*this); - return *this; - } - - template<class _Tp1> - __shared_ptr& - operator=(__shared_ptr<_Tp1, _Lp>&& __r) noexcept - { - __shared_ptr(std::move(__r)).swap(*this); - return *this; - } - - 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() noexcept - { __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, _Alloc __a) - { __shared_ptr(__p, __d, std::move(__a)).swap(*this); } - - // Allow class instantiation when _Tp is [cv-qual] void. - typename std::add_lvalue_reference<_Tp>::type - operator*() const noexcept - { - _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0); - return *_M_ptr; - } - - _Tp* - operator->() const noexcept - { - _GLIBCXX_DEBUG_ASSERT(_M_ptr != 0); - return _M_ptr; - } - - _Tp* - get() const noexcept - { return _M_ptr; } - - explicit operator bool() const // never throws - { return _M_ptr == 0 ? false : true; } - - bool - unique() const noexcept - { return _M_refcount._M_unique(); } - - long - use_count() const noexcept - { return _M_refcount._M_get_use_count(); } - - void - swap(__shared_ptr<_Tp, _Lp>& __other) noexcept - { - 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); } - -#ifdef __GXX_RTTI - protected: - // This constructor is non-standard, it is used by allocate_shared. - template<typename _Alloc, typename... _Args> - __shared_ptr(_Sp_make_shared_tag __tag, const _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); - } -#else - template<typename _Alloc> - struct _Deleter - { - void operator()(_Tp* __ptr) - { - typedef allocator_traits<_Alloc> _Alloc_traits; - _Alloc_traits::destroy(_M_alloc, __ptr); - _Alloc_traits::deallocate(_M_alloc, __ptr, 1); - } - _Alloc _M_alloc; - }; - - template<typename _Alloc, typename... _Args> - __shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a, - _Args&&... __args) - : _M_ptr(), _M_refcount() - { - typedef typename _Alloc::template rebind<_Tp>::other _Alloc2; - _Deleter<_Alloc2> __del = { _Alloc2(__a) }; - typedef allocator_traits<_Alloc2> __traits; - _M_ptr = __traits::allocate(__del._M_alloc, 1); - __try - { - // _GLIBCXX_RESOLVE_LIB_DEFECTS - // 2070. allocate_shared should use allocator_traits<A>::construct - __traits::construct(__del._M_alloc, _M_ptr, - std::forward<_Args>(__args)...); - } - __catch(...) - { - __traits::deallocate(__del._M_alloc, _M_ptr, 1); - __throw_exception_again; - } - __shared_count<_Lp> __count(_M_ptr, __del, __del._M_alloc); - _M_refcount._M_swap(__count); - __enable_shared_from_this_helper(_M_refcount, _M_ptr, _M_ptr); - } -#endif - - template<typename _Tp1, _Lock_policy _Lp1, typename _Alloc, - typename... _Args> - friend __shared_ptr<_Tp1, _Lp1> - __allocate_shared(const _Alloc& __a, _Args&&... __args); - - private: - void* - _M_get_deleter(const std::type_info& __ti) const noexcept - { 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>&) noexcept; - - _Tp* _M_ptr; // Contained pointer. - __shared_count<_Lp> _M_refcount; // Reference counter. - }; - - - // 20.7.2.2.7 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) noexcept - { return __a.get() == __b.get(); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator==(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept - { return !__a; } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator==(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept - { return !__a; } - - template<typename _Tp1, typename _Tp2, _Lock_policy _Lp> - inline bool - operator!=(const __shared_ptr<_Tp1, _Lp>& __a, - const __shared_ptr<_Tp2, _Lp>& __b) noexcept - { return __a.get() != __b.get(); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator!=(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept - { return (bool)__a; } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator!=(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept - { return (bool)__a; } - - template<typename _Tp1, typename _Tp2, _Lock_policy _Lp> - inline bool - operator<(const __shared_ptr<_Tp1, _Lp>& __a, - const __shared_ptr<_Tp2, _Lp>& __b) noexcept - { - typedef typename std::common_type<_Tp1*, _Tp2*>::type _CT; - return std::less<_CT>()(__a.get(), __b.get()); - } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator<(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept - { return std::less<_Tp*>()(__a.get(), nullptr); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator<(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept - { return std::less<_Tp*>()(nullptr, __a.get()); } - - template<typename _Tp1, typename _Tp2, _Lock_policy _Lp> - inline bool - operator<=(const __shared_ptr<_Tp1, _Lp>& __a, - const __shared_ptr<_Tp2, _Lp>& __b) noexcept - { return !(__b < __a); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator<=(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept - { return !(nullptr < __a); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator<=(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept - { return !(__a < nullptr); } - - template<typename _Tp1, typename _Tp2, _Lock_policy _Lp> - inline bool - operator>(const __shared_ptr<_Tp1, _Lp>& __a, - const __shared_ptr<_Tp2, _Lp>& __b) noexcept - { return (__b < __a); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator>(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept - { return std::less<_Tp*>()(nullptr, __a.get()); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator>(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept - { return std::less<_Tp*>()(__a.get(), nullptr); } - - template<typename _Tp1, typename _Tp2, _Lock_policy _Lp> - inline bool - operator>=(const __shared_ptr<_Tp1, _Lp>& __a, - const __shared_ptr<_Tp2, _Lp>& __b) noexcept - { return !(__a < __b); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator>=(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept - { return !(__a < nullptr); } - - template<typename _Tp, _Lock_policy _Lp> - inline bool - operator>=(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept - { return !(nullptr < __a); } - - template<typename _Sp> - struct _Sp_less : public binary_function<_Sp, _Sp, bool> - { - bool - operator()(const _Sp& __lhs, const _Sp& __rhs) const noexcept - { - typedef typename _Sp::element_type element_type; - return std::less<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>> - { }; - - // 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) noexcept - { __a.swap(__b); } - - // 2.2.3.9 shared_ptr casts - - // The seemingly equivalent code: - // shared_ptr<_Tp, _Lp>(static_cast<_Tp*>(__r.get())) - // will eventually result in undefined behaviour, attempting to - // delete the same object twice. - /// static_pointer_cast - template<typename _Tp, typename _Tp1, _Lock_policy _Lp> - inline __shared_ptr<_Tp, _Lp> - static_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r) noexcept - { return __shared_ptr<_Tp, _Lp>(__r, static_cast<_Tp*>(__r.get())); } - - // The seemingly equivalent code: - // shared_ptr<_Tp, _Lp>(const_cast<_Tp*>(__r.get())) - // will eventually result in undefined behaviour, attempting to - // delete the same object twice. - /// const_pointer_cast - template<typename _Tp, typename _Tp1, _Lock_policy _Lp> - inline __shared_ptr<_Tp, _Lp> - const_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r) noexcept - { return __shared_ptr<_Tp, _Lp>(__r, const_cast<_Tp*>(__r.get())); } - - // The seemingly equivalent code: - // shared_ptr<_Tp, _Lp>(dynamic_cast<_Tp*>(__r.get())) - // will eventually result in undefined behaviour, attempting to - // delete the same object twice. - /// dynamic_pointer_cast - template<typename _Tp, typename _Tp1, _Lock_policy _Lp> - inline __shared_ptr<_Tp, _Lp> - dynamic_pointer_cast(const __shared_ptr<_Tp1, _Lp>& __r) noexcept - { - if (_Tp* __p = dynamic_cast<_Tp*>(__r.get())) - return __shared_ptr<_Tp, _Lp>(__r, __p); - return __shared_ptr<_Tp, _Lp>(); - } - - - template<typename _Tp, _Lock_policy _Lp> - class __weak_ptr - { - public: - typedef _Tp element_type; - - constexpr __weak_ptr() noexcept - : _M_ptr(0), _M_refcount() - { } - - __weak_ptr(const __weak_ptr&) noexcept = default; - __weak_ptr& operator=(const __weak_ptr&) noexcept = default; - ~__weak_ptr() = default; - - // 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, typename = typename - std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type> - __weak_ptr(const __weak_ptr<_Tp1, _Lp>& __r) noexcept - : _M_refcount(__r._M_refcount) - { _M_ptr = __r.lock().get(); } - - template<typename _Tp1, typename = typename - std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type> - __weak_ptr(const __shared_ptr<_Tp1, _Lp>& __r) noexcept - : _M_ptr(__r._M_ptr), _M_refcount(__r._M_refcount) - { } - - template<typename _Tp1> - __weak_ptr& - operator=(const __weak_ptr<_Tp1, _Lp>& __r) noexcept - { - _M_ptr = __r.lock().get(); - _M_refcount = __r._M_refcount; - return *this; - } - - template<typename _Tp1> - __weak_ptr& - operator=(const __shared_ptr<_Tp1, _Lp>& __r) noexcept - { - _M_ptr = __r._M_ptr; - _M_refcount = __r._M_refcount; - return *this; - } - - __shared_ptr<_Tp, _Lp> - lock() const noexcept - { -#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 noexcept - { return _M_refcount._M_get_use_count(); } - - bool - expired() const noexcept - { 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() noexcept - { __weak_ptr().swap(*this); } - - void - swap(__weak_ptr& __s) noexcept - { - std::swap(_M_ptr, __s._M_ptr); - _M_refcount._M_swap(__s._M_refcount); - } - - private: - // Used by __enable_shared_from_this. - void - _M_assign(_Tp* __ptr, const __shared_count<_Lp>& __refcount) noexcept - { - _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. - }; - - // 20.7.2.3.6 weak_ptr specialized algorithms. - template<typename _Tp, _Lock_policy _Lp> - inline void - swap(__weak_ptr<_Tp, _Lp>& __a, __weak_ptr<_Tp, _Lp>& __b) noexcept - { __a.swap(__b); } - - 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: - constexpr __enable_shared_from_this() noexcept { } - - __enable_shared_from_this(const __enable_shared_from_this&) noexcept { } - - __enable_shared_from_this& - operator=(const __enable_shared_from_this&) noexcept - { 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 noexcept - { _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) noexcept - { - if (__pe != 0) - __pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn); - } - - mutable __weak_ptr<_Tp, _Lp> _M_weak_this; - }; - - - template<typename _Tp, _Lock_policy _Lp, typename _Alloc, typename... _Args> - inline __shared_ptr<_Tp, _Lp> - __allocate_shared(const _Alloc& __a, _Args&&... __args) - { - return __shared_ptr<_Tp, _Lp>(_Sp_make_shared_tag(), __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 std::__allocate_shared<_Tp, _Lp>(std::allocator<_Tp_nc>(), - std::forward<_Args>(__args)...); - } - - /// std::hash specialization for __shared_ptr. - template<typename _Tp, _Lock_policy _Lp> - struct hash<__shared_ptr<_Tp, _Lp>> - : public __hash_base<size_t, __shared_ptr<_Tp, _Lp>> - { - size_t - operator()(const __shared_ptr<_Tp, _Lp>& __s) const noexcept - { return std::hash<_Tp*>()(__s.get()); } - }; - -_GLIBCXX_END_NAMESPACE_VERSION -} // namespace - -#endif // _SHARED_PTR_BASE_H |