512K
+ l4(qF
d _I|+ ? // shared_ptr and weak_ptr implementation -*- C++ -*-
// Copyright (C) 2007-2021 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
// .
// 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
* 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 // std::basic_ostream
#include
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup pointer_abstractions
* @{
*/
// 20.7.2.2.11 shared_ptr I/O
/// Write the stored pointer to an ostream.
/// @relates shared_ptr
template
inline std::basic_ostream<_Ch, _Tr>&
operator<<(std::basic_ostream<_Ch, _Tr>& __os,
const __shared_ptr<_Tp, _Lp>& __p)
{
__os << __p.get();
return __os;
}
template
inline _Del*
get_deleter(const __shared_ptr<_Tp, _Lp>& __p) noexcept
{
#if __cpp_rtti
return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del)));
#else
return 0;
#endif
}
/// 20.7.2.2.10 shared_ptr get_deleter
/// If `__p` has a deleter of type `_Del`, return a pointer to it.
/// @relates shared_ptr
template
inline _Del*
get_deleter(const shared_ptr<_Tp>& __p) noexcept
{
#if __cpp_rtti
return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del)));
#else
return 0;
#endif
}
/**
* @brief A smart pointer with reference-counted copy semantics.
*
* A `shared_ptr` object is either empty or _owns_ a pointer passed
* to the constructor. Copies of a `shared_ptr` share ownership of
* the same pointer. When the last `shared_ptr` that owns the pointer
* is destroyed or reset, the owned pointer is freed (either by `delete`
* or by invoking a custom deleter that was passed to the constructor).
*
* A `shared_ptr` also stores another pointer, which is usually
* (but not always) the same pointer as it owns. The stored pointer
* can be retrieved by calling the `get()` member function.
*
* The equality and relational operators for `shared_ptr` only compare
* the stored pointer returned by `get()`, not the owned pointer.
* To test whether two `shared_ptr` objects share ownership of the same
* pointer see `std::shared_ptr::owner_before` and `std::owner_less`.
*/