b9a2658a3e
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.
63 lines
2.0 KiB
C++
63 lines
2.0 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_FLAT_MAP
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#define _LIBCPP_FLAT_MAP
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/*
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Header <flat_map> synopsis
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#include <compare> // see [compare.syn]
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#include <initializer_list> // see [initializer.list.syn]
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namespace std {
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// [flat.map], class template flat_map
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template<class Key, class T, class Compare = less<Key>,
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class KeyContainer = vector<Key>, class MappedContainer = vector<T>>
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class flat_map;
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struct sorted_unique_t { explicit sorted_unique_t() = default; };
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inline constexpr sorted_unique_t sorted_unique{};
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template<class Key, class T, class Compare, class KeyContainer, class MappedContainer,
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class Allocator>
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struct uses_allocator<flat_map<Key, T, Compare, KeyContainer, MappedContainer>,
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Allocator>;
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// [flat.map.erasure], erasure for flat_map
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template<class Key, class T, class Compare, class KeyContainer, class MappedContainer,
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class Predicate>
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typename flat_map<Key, T, Compare, KeyContainer, MappedContainer>::size_type
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erase_if(flat_map<Key, T, Compare, KeyContainer, MappedContainer>& c, Predicate pred);
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*/
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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/__config>
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#else
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# include <__config>
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# if _LIBCPP_STD_VER >= 23
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# include <__flat_map/flat_map.h>
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# include <__flat_map/sorted_unique.h>
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# endif
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// for feature-test macros
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# include <version>
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// standard required includes
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# include <compare>
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# include <initializer_list>
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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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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_FLAT_MAP
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