--- /dev/null
+// 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
projects / msp430-gcc.git / blobdiff