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.
108 lines
3.0 KiB
C++
108 lines
3.0 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_INITIALIZER_LIST
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#define _LIBCPP_INITIALIZER_LIST
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/*
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initializer_list synopsis
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namespace std
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{
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template<class E>
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class initializer_list
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{
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public:
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typedef E value_type;
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typedef const E& reference;
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typedef const E& const_reference;
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typedef size_t size_type;
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typedef const E* iterator;
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typedef const E* const_iterator;
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initializer_list() noexcept; // constexpr in C++14
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size_t size() const noexcept; // constexpr in C++14
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const E* begin() const noexcept; // constexpr in C++14
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const E* end() const noexcept; // constexpr in C++14
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};
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template<class E> const E* begin(initializer_list<E> il) noexcept; // constexpr in C++14
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template<class E> const E* end(initializer_list<E> il) noexcept; // constexpr in C++14
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} // std
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*/
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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/initializer_list>
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#else
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# include <__config>
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# include <__cstddef/size_t.h>
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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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namespace std // purposefully not versioned
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{
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# ifndef _LIBCPP_CXX03_LANG
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template <class _Ep>
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class _LIBCPP_TEMPLATE_VIS initializer_list {
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const _Ep* __begin_;
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size_t __size_;
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 initializer_list(const _Ep* __b, size_t __s) _NOEXCEPT
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: __begin_(__b),
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__size_(__s) {}
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public:
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typedef _Ep value_type;
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typedef const _Ep& reference;
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typedef const _Ep& const_reference;
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typedef size_t size_type;
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typedef const _Ep* iterator;
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typedef const _Ep* const_iterator;
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 initializer_list() _NOEXCEPT : __begin_(nullptr), __size_(0) {}
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 size_t size() const _NOEXCEPT { return __size_; }
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Ep* begin() const _NOEXCEPT { return __begin_; }
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Ep* end() const _NOEXCEPT { return __begin_ + __size_; }
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};
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template <class _Ep>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Ep* begin(initializer_list<_Ep> __il) _NOEXCEPT {
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return __il.begin();
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}
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template <class _Ep>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Ep* end(initializer_list<_Ep> __il) _NOEXCEPT {
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return __il.end();
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}
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# endif // !defined(_LIBCPP_CXX03_LANG)
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} // namespace std
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# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
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# include <cstddef>
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# endif
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_INITIALIZER_LIST
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