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This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_MEMORY_RESOURCE
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#define _LIBCPP_MEMORY_RESOURCE
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/**
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memory_resource synopsis
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// C++17
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namespace std::pmr {
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class memory_resource;
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bool operator==(const memory_resource& a,
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const memory_resource& b) noexcept;
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bool operator!=(const memory_resource& a,
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const memory_resource& b) noexcept; // removed in C++20
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template <class Tp> class polymorphic_allocator;
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template <class T1, class T2>
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bool operator==(const polymorphic_allocator<T1>& a,
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const polymorphic_allocator<T2>& b) noexcept;
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template <class T1, class T2>
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bool operator!=(const polymorphic_allocator<T1>& a,
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const polymorphic_allocator<T2>& b) noexcept; // removed in C++20
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// Global memory resources
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memory_resource* set_default_resource(memory_resource* r) noexcept;
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memory_resource* get_default_resource() noexcept;
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memory_resource* new_delete_resource() noexcept;
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memory_resource* null_memory_resource() noexcept;
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// Pool resource classes
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struct pool_options;
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class synchronized_pool_resource;
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class unsynchronized_pool_resource;
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class monotonic_buffer_resource;
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} // namespace std::pmr
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*/
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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/memory_resource>
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#else
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# include <__config>
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# if _LIBCPP_STD_VER >= 17
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# include <__memory_resource/memory_resource.h>
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# include <__memory_resource/monotonic_buffer_resource.h>
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# include <__memory_resource/polymorphic_allocator.h>
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# include <__memory_resource/pool_options.h>
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# include <__memory_resource/synchronized_pool_resource.h>
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# include <__memory_resource/unsynchronized_pool_resource.h>
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# endif
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# include <version>
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# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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# endif
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# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER >= 17 && _LIBCPP_STD_VER <= 20
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# include <mutex>
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# endif
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# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
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# include <stdexcept>
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# endif
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif /* _LIBCPP_MEMORY_RESOURCE */
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