mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-12-26 04:25:51 +08:00
b1e7c6fce1
By moving std::make_obj_using_allocator and the related "utility functions for uses-allocator construction" to a new header, we can avoid including the whole of <memory> in <scoped_allocator> and <memory_resource>. In order to simplify the implementation of those utility functions they now use concepts unconditionally. They are no longer defined if __cpp_concepts is not defined. To simplify the code that uses those functions I've introduced a __cpp_lib_make_obj_using_allocator feature test macro (not specified in the standard, which might be an oversight). That allows the code in <memory_resource> and <scoped_allocator> to check the feature test macro to decide whether to use the new utilities, or fall back to the C++17 code. At the same time, this reshuffles some of the headers included by <memory> so that they are (mostly?) self-contained. It should no longer be necessary to include other headers before <bits/shared_ptr.h> when other parts of the library want to use std::shared_ptr without including the whole of <memory>. libstdc++-v3/ChangeLog: * include/Makefile.am: Add new header. * include/Makefile.in: Regenerate. * include/bits/shared_ptr.h: Include <iosfwd>. * include/bits/shared_ptr_base.h: Include required headers here directly, instead of in <memory>. * include/bits/uses_allocator_args.h: New file. Move utility functions for uses-allocator construction from <memory> to here. Only define the utility functions when concepts are available. (__cpp_lib_make_obj_using_allocator): Define non-standard feature test macro. * include/std/condition_variable: Remove unused headers. * include/std/future: Likewise. * include/std/memory: Remove headers that are not needed directly, and are now inclkuded where they're needed. Include new <bits/uses_allocator_args.h> header. * include/std/memory_resource: Include only the necessary headers. Use new feature test macro to detect support for the utility functions. * include/std/scoped_allocator: Likewise. * include/std/version (__cpp_lib_make_obj_using_allocator): Define.
152 lines
4.4 KiB
C++
152 lines
4.4 KiB
C++
// <memory> -*- C++ -*-
|
|
|
|
// Copyright (C) 2001-2020 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/>.
|
|
|
|
/*
|
|
* Copyright (c) 1997-1999
|
|
* Silicon Graphics Computer Systems, Inc.
|
|
*
|
|
* Permission to use, copy, modify, distribute and sell this software
|
|
* and its documentation for any purpose is hereby granted without fee,
|
|
* provided that the above copyright notice appear in all copies and
|
|
* that both that copyright notice and this permission notice appear
|
|
* in supporting documentation. Silicon Graphics makes no
|
|
* representations about the suitability of this software for any
|
|
* purpose. It is provided "as is" without express or implied warranty.
|
|
*
|
|
*/
|
|
|
|
/** @file include/memory
|
|
* This is a Standard C++ Library header.
|
|
* @ingroup memory
|
|
*/
|
|
|
|
#ifndef _GLIBCXX_MEMORY
|
|
#define _GLIBCXX_MEMORY 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
/**
|
|
* @defgroup memory Memory
|
|
* @ingroup utilities
|
|
*
|
|
* Components for memory allocation, deallocation, and management.
|
|
*/
|
|
|
|
/**
|
|
* @defgroup pointer_abstractions Pointer Abstractions
|
|
* @ingroup memory
|
|
*
|
|
* Smart pointers, etc.
|
|
*/
|
|
|
|
#include <bits/stl_algobase.h>
|
|
#include <bits/allocator.h>
|
|
#include <bits/stl_construct.h>
|
|
#include <bits/stl_uninitialized.h>
|
|
#include <bits/stl_tempbuf.h>
|
|
#include <bits/stl_raw_storage_iter.h>
|
|
|
|
#if __cplusplus >= 201103L
|
|
# include <type_traits>
|
|
# include <bits/align.h>
|
|
# include <bits/uses_allocator.h>
|
|
# include <bits/alloc_traits.h>
|
|
# include <debug/debug.h>
|
|
# include <bits/unique_ptr.h>
|
|
# include <bits/shared_ptr.h>
|
|
# include <bits/shared_ptr_atomic.h>
|
|
#endif
|
|
|
|
#if __cplusplus < 201103L || _GLIBCXX_USE_DEPRECATED
|
|
# include <backward/auto_ptr.h>
|
|
#endif
|
|
|
|
#if __cplusplus > 201703L
|
|
# include <bits/ranges_uninitialized.h>
|
|
# include <bits/uses_allocator_args.h>
|
|
#endif
|
|
|
|
#if __cplusplus >= 201103L
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/** @defgroup ptr_safety Pointer Safety and Garbage Collection
|
|
* @ingroup memory
|
|
*
|
|
* Utilities to assist with garbage collection in an implementation
|
|
* that supports <em>strict pointer safety</em>.
|
|
* This implementation only supports <em>relaxed pointer safety</em>
|
|
* and so these functions have no effect.
|
|
*
|
|
* C++11 20.6.4 [util.dynamic.safety], Pointer safety
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/// Constants representing the different types of pointer safety.
|
|
enum class pointer_safety { relaxed, preferred, strict };
|
|
|
|
/// Inform a garbage collector that an object is still in use.
|
|
inline void
|
|
declare_reachable(void*) { }
|
|
|
|
/// Unregister an object previously registered with declare_reachable.
|
|
template <typename _Tp>
|
|
inline _Tp*
|
|
undeclare_reachable(_Tp* __p) { return __p; }
|
|
|
|
/// Inform a garbage collector that a region of memory need not be traced.
|
|
inline void
|
|
declare_no_pointers(char*, size_t) { }
|
|
|
|
/// Unregister a range previously registered with declare_no_pointers.
|
|
inline void
|
|
undeclare_no_pointers(char*, size_t) { }
|
|
|
|
/// The type of pointer safety supported by the implementation.
|
|
inline pointer_safety
|
|
get_pointer_safety() noexcept { return pointer_safety::relaxed; }
|
|
// @}
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
#endif // C++11
|
|
|
|
#if __cplusplus >= 201703L
|
|
// Parallel STL algorithms
|
|
# if _PSTL_EXECUTION_POLICIES_DEFINED
|
|
// If <execution> has already been included, pull in implementations
|
|
# include <pstl/glue_memory_impl.h>
|
|
# else
|
|
// Otherwise just pull in forward declarations
|
|
# include <pstl/glue_memory_defs.h>
|
|
# endif
|
|
|
|
// Feature test macro for parallel algorithms
|
|
# define __cpp_lib_parallel_algorithm 201603L
|
|
#endif // C++17
|
|
|
|
#endif /* _GLIBCXX_MEMORY */
|