--- /dev/null
+// shared_ptr and weak_ptr implementation -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 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.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{memory}
+ */
+
+#ifndef _SHARED_PTR_H
+#define _SHARED_PTR_H 1
+
+#include <bits/shared_ptr_base.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @addtogroup pointer_abstractions
+ * @{
+ */
+
+ /// 2.2.3.7 shared_ptr I/O
+ template<typename _Ch, typename _Tr, typename _Tp, _Lock_policy _Lp>
+ inline std::basic_ostream<_Ch, _Tr>&
+ operator<<(std::basic_ostream<_Ch, _Tr>& __os,
+ const __shared_ptr<_Tp, _Lp>& __p)
+ {
+ __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) noexcept
+ {
+#ifdef __GXX_RTTI
+ return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del)));
+#else
+ return 0;
+#endif
+ }
+
+
+ /**
+ * @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:
+ /**
+ * @brief Construct an empty %shared_ptr.
+ * @post use_count()==0 && get()==0
+ */
+ constexpr shared_ptr() noexcept
+ : __shared_ptr<_Tp>() { }
+
+ shared_ptr(const shared_ptr&) noexcept = default;
+
+ /**
+ * @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)
+ : __shared_ptr<_Tp>(__p) { }
+
+ /**
+ * @brief Construct a %shared_ptr that owns the pointer @a __p
+ * and the deleter @a __d.
+ * @param __p A pointer.
+ * @param __d A deleter.
+ * @post use_count() == 1 && get() == __p
+ * @throw std::bad_alloc, in which case @a __d(__p) is called.
+ *
+ * Requirements: _Deleter's copy constructor and destructor must
+ * not throw
+ *
+ * __shared_ptr will release __p by calling __d(__p)
+ */
+ template<typename _Tp1, typename _Deleter>
+ shared_ptr(_Tp1* __p, _Deleter __d)
+ : __shared_ptr<_Tp>(__p, __d) { }
+
+ /**
+ * @brief Construct a %shared_ptr that owns a null pointer
+ * and the deleter @a __d.
+ * @param __p A null pointer constant.
+ * @param __d A deleter.
+ * @post use_count() == 1 && get() == __p
+ * @throw std::bad_alloc, in which case @a __d(__p) is called.
+ *
+ * Requirements: _Deleter's copy constructor and destructor must
+ * not throw
+ *
+ * The last owner will call __d(__p)
+ */
+ template<typename _Deleter>
+ shared_ptr(nullptr_t __p, _Deleter __d)
+ : __shared_ptr<_Tp>(__p, __d) { }
+
+ /**
+ * @brief Construct a %shared_ptr that owns the pointer @a __p
+ * and the deleter @a __d.
+ * @param __p A pointer.
+ * @param __d A deleter.
+ * @param __a An allocator.
+ * @post use_count() == 1 && get() == __p
+ * @throw std::bad_alloc, in which case @a __d(__p) is called.
+ *
+ * Requirements: _Deleter's copy constructor and destructor must
+ * not throw _Alloc's copy constructor and destructor must not
+ * throw.
+ *
+ * __shared_ptr will release __p by calling __d(__p)
+ */
+ template<typename _Tp1, typename _Deleter, typename _Alloc>
+ shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a)
+ : __shared_ptr<_Tp>(__p, __d, std::move(__a)) { }
+
+ /**
+ * @brief Construct a %shared_ptr that owns a null pointer
+ * and the deleter @a __d.
+ * @param __p A null pointer constant.
+ * @param __d A deleter.
+ * @param __a An allocator.
+ * @post use_count() == 1 && get() == __p
+ * @throw std::bad_alloc, in which case @a __d(__p) is called.
+ *
+ * Requirements: _Deleter's copy constructor and destructor must
+ * not throw _Alloc's copy constructor and destructor must not
+ * throw.
+ *
+ * The last owner will call __d(__p)
+ */
+ template<typename _Deleter, typename _Alloc>
+ shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a)
+ : __shared_ptr<_Tp>(__p, __d, std::move(__a)) { }
+
+ // Aliasing constructor
+
+ /**
+ * @brief Constructs a %shared_ptr instance that stores @a __p
+ * and shares ownership with @a __r.
+ * @param __r A %shared_ptr.
+ * @param __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>& __r, _Tp* __p) noexcept
+ : __shared_ptr<_Tp>(__r, __p) { }
+
+ /**
+ * @brief If @a __r is empty, constructs an empty %shared_ptr;
+ * otherwise construct a %shared_ptr that shares ownership
+ * with @a __r.
+ * @param __r A %shared_ptr.
+ * @post get() == __r.get() && use_count() == __r.use_count()
+ */
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ shared_ptr(const shared_ptr<_Tp1>& __r) noexcept
+ : __shared_ptr<_Tp>(__r) { }
+
+ /**
+ * @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) noexcept
+ : __shared_ptr<_Tp>(std::move(__r)) { }
+
+ /**
+ * @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, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ shared_ptr(shared_ptr<_Tp1>&& __r) noexcept
+ : __shared_ptr<_Tp>(std::move(__r)) { }
+
+ /**
+ * @brief Constructs a %shared_ptr that shares ownership with @a __r
+ * and stores a copy of the pointer stored in @a __r.
+ * @param __r A weak_ptr.
+ * @post use_count() == __r.use_count()
+ * @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>& __r)
+ : __shared_ptr<_Tp>(__r) { }
+
+#if _GLIBCXX_USE_DEPRECATED
+ template<typename _Tp1>
+ shared_ptr(std::auto_ptr<_Tp1>&& __r)
+ : __shared_ptr<_Tp>(std::move(__r)) { }
+#endif
+
+ template<typename _Tp1, typename _Del>
+ shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r)
+ : __shared_ptr<_Tp>(std::move(__r)) { }
+
+ /**
+ * @brief Construct an empty %shared_ptr.
+ * @param __p A null pointer constant.
+ * @post use_count() == 0 && get() == nullptr
+ */
+ constexpr shared_ptr(nullptr_t __p) noexcept
+ : __shared_ptr<_Tp>(__p) { }
+
+ shared_ptr& operator=(const shared_ptr&) noexcept = default;
+
+ template<typename _Tp1>
+ shared_ptr&
+ operator=(const shared_ptr<_Tp1>& __r) noexcept
+ {
+ this->__shared_ptr<_Tp>::operator=(__r);
+ return *this;
+ }
+
+#if _GLIBCXX_USE_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) noexcept
+ {
+ this->__shared_ptr<_Tp>::operator=(std::move(__r));
+ return *this;
+ }
+
+ template<class _Tp1>
+ shared_ptr&
+ operator=(shared_ptr<_Tp1>&& __r) noexcept
+ {
+ this->__shared_ptr<_Tp>::operator=(std::move(__r));
+ return *this;
+ }
+
+ 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, const _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(const _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) noexcept
+ { return __a.get() == __b.get(); }
+
+ template<typename _Tp>
+ inline bool
+ operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return !__a; }
+
+ template<typename _Tp>
+ inline bool
+ operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return !__a; }
+
+ template<typename _Tp1, typename _Tp2>
+ inline bool
+ operator!=(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ { return __a.get() != __b.get(); }
+
+ template<typename _Tp>
+ inline bool
+ operator!=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return (bool)__a; }
+
+ template<typename _Tp>
+ inline bool
+ operator!=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return (bool)__a; }
+
+ template<typename _Tp1, typename _Tp2>
+ inline bool
+ operator<(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ {
+ typedef typename std::common_type<_Tp1*, _Tp2*>::type _CT;
+ return std::less<_CT>()(__a.get(), __b.get());
+ }
+
+ template<typename _Tp>
+ inline bool
+ operator<(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return std::less<_Tp*>()(__a.get(), nullptr); }
+
+ template<typename _Tp>
+ inline bool
+ operator<(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return std::less<_Tp*>()(nullptr, __a.get()); }
+
+ template<typename _Tp1, typename _Tp2>
+ inline bool
+ operator<=(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ { return !(__b < __a); }
+
+ template<typename _Tp>
+ inline bool
+ operator<=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return !(nullptr < __a); }
+
+ template<typename _Tp>
+ inline bool
+ operator<=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return !(__a < nullptr); }
+
+ template<typename _Tp1, typename _Tp2>
+ inline bool
+ operator>(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ { return (__b < __a); }
+
+ template<typename _Tp>
+ inline bool
+ operator>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return std::less<_Tp*>()(nullptr, __a.get()); }
+
+ template<typename _Tp>
+ inline bool
+ operator>(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return std::less<_Tp*>()(__a.get(), nullptr); }
+
+ template<typename _Tp1, typename _Tp2>
+ inline bool
+ operator>=(const shared_ptr<_Tp1>& __a,
+ const shared_ptr<_Tp2>& __b) noexcept
+ { return !(__a < __b); }
+
+ template<typename _Tp>
+ inline bool
+ operator>=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
+ { return !(__a < nullptr); }
+
+ template<typename _Tp>
+ inline bool
+ operator>=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
+ { return !(nullptr < __a); }
+
+ template<typename _Tp>
+ struct less<shared_ptr<_Tp>> : public _Sp_less<shared_ptr<_Tp>>
+ { };
+
+ // 20.8.13.2.9 shared_ptr specialized algorithms.
+ template<typename _Tp>
+ inline void
+ swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>& __b) noexcept
+ { __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) noexcept
+ { 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) noexcept
+ { 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) noexcept
+ {
+ 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:
+ constexpr weak_ptr() noexcept
+ : __weak_ptr<_Tp>() { }
+
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ weak_ptr(const weak_ptr<_Tp1>& __r) noexcept
+ : __weak_ptr<_Tp>(__r) { }
+
+ template<typename _Tp1, typename = typename
+ std::enable_if<std::is_convertible<_Tp1*, _Tp*>::value>::type>
+ weak_ptr(const shared_ptr<_Tp1>& __r) noexcept
+ : __weak_ptr<_Tp>(__r) { }
+
+ template<typename _Tp1>
+ weak_ptr&
+ operator=(const weak_ptr<_Tp1>& __r) noexcept
+ {
+ this->__weak_ptr<_Tp>::operator=(__r);
+ return *this;
+ }
+
+ template<typename _Tp1>
+ weak_ptr&
+ operator=(const shared_ptr<_Tp1>& __r) noexcept
+ {
+ this->__weak_ptr<_Tp>::operator=(__r);
+ return *this;
+ }
+
+ shared_ptr<_Tp>
+ lock() const noexcept
+ {
+#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
+ }
+ };
+
+ // 20.8.13.3.7 weak_ptr specialized algorithms.
+ template<typename _Tp>
+ inline void
+ swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b) noexcept
+ { __a.swap(__b); }
+
+
+ /// Primary template owner_less
+ template<typename _Tp>
+ struct owner_less;
+
+ /// Partial specialization of owner_less for shared_ptr.
+ template<typename _Tp>
+ struct owner_less<shared_ptr<_Tp>>
+ : public _Sp_owner_less<shared_ptr<_Tp>, weak_ptr<_Tp>>
+ { };
+
+ /// Partial specialization of owner_less for weak_ptr.
+ template<typename _Tp>
+ struct owner_less<weak_ptr<_Tp>>
+ : public _Sp_owner_less<weak_ptr<_Tp>, shared_ptr<_Tp>>
+ { };
+
+ /**
+ * @brief Base class allowing use of member function shared_from_this.
+ */
+ template<typename _Tp>
+ 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>
+ 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 noexcept
+ { _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) noexcept
+ {
+ if (__pe != 0)
+ __pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
+ }
+
+ mutable weak_ptr<_Tp> _M_weak_this;
+ };
+
+ /**
+ * @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(const _Alloc& __a, _Args&&... __args)
+ {
+ return shared_ptr<_Tp>(_Sp_make_shared_tag(), __a,
+ std::forward<_Args>(__args)...);
+ }
+
+ /**
+ * @brief Create an object that is owned by a shared_ptr.
+ * @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 std::allocate_shared<_Tp>(std::allocator<_Tp_nc>(),
+ std::forward<_Args>(__args)...);
+ }
+
+ /// std::hash specialization for shared_ptr.
+ template<typename _Tp>
+ struct hash<shared_ptr<_Tp>>
+ : public __hash_base<size_t, shared_ptr<_Tp>>
+ {
+ size_t
+ operator()(const shared_ptr<_Tp>& __s) const noexcept
+ { return std::hash<_Tp*>()(__s.get()); }
+ };
+
+ // @} group pointer_abstractions
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif // _SHARED_PTR_H
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