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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.
135 lines
4.4 KiB
C++
135 lines
4.4 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_EXPERIMENTAL_ITERATOR
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#define _LIBCPP_EXPERIMENTAL_ITERATOR
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/*
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namespace std {
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namespace experimental {
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inline namespace fundamentals_v2 {
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template <class DelimT, class charT = char, class traits = char_traits<charT>>
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class ostream_joiner {
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public:
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typedef charT char_type;
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typedef traits traits_type;
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typedef basic_ostream<charT, traits> ostream_type;
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typedef output_iterator_tag iterator_category;
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typedef void value_type;
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typedef void difference_type;
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typedef void pointer;
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typedef void reference;
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ostream_joiner(ostream_type& s, const DelimT& delimiter);
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ostream_joiner(ostream_type& s, DelimT&& delimiter);
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template<typename T>
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ostream_joiner& operator=(const T& value);
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ostream_joiner& operator*() noexcept;
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ostream_joiner& operator++() noexcept;
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ostream_joiner& operator++(int) noexcept;
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private:
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ostream_type* out_stream; // exposition only
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DelimT delim; // exposition only
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bool first_element; // exposition only
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};
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template <class charT, class traits, class DelimT>
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ostream_joiner<decay_t<DelimT>, charT, traits>
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make_ostream_joiner(basic_ostream<charT, traits>& os, DelimT&& delimiter);
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} // inline namespace fundamentals_v2
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} // namespace experimental
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} // namespace std
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*/
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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/experimental/iterator>
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#else
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# include <__config>
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# include <__memory/addressof.h>
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# include <__ostream/basic_ostream.h>
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# include <__string/char_traits.h>
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# include <__type_traits/decay.h>
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# include <__utility/forward.h>
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# include <__utility/move.h>
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# include <iterator>
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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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_LIBCPP_PUSH_MACROS
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# include <__undef_macros>
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# if _LIBCPP_STD_VER >= 14
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_LIBCPP_BEGIN_NAMESPACE_LFTS
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template <class _Delim, class _CharT = char, class _Traits = char_traits<_CharT>>
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class ostream_joiner {
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public:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef basic_ostream<char_type, traits_type> ostream_type;
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typedef output_iterator_tag iterator_category;
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typedef void value_type;
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typedef void difference_type;
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typedef void pointer;
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typedef void reference;
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_LIBCPP_HIDE_FROM_ABI ostream_joiner(ostream_type& __os, _Delim&& __d)
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: __output_iter_(std::addressof(__os)), __delim_(std::move(__d)), __first_(true) {}
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_LIBCPP_HIDE_FROM_ABI ostream_joiner(ostream_type& __os, const _Delim& __d)
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: __output_iter_(std::addressof(__os)), __delim_(__d), __first_(true) {}
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template <typename _Tp>
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_LIBCPP_HIDE_FROM_ABI ostream_joiner& operator=(const _Tp& __v) {
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if (!__first_)
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*__output_iter_ << __delim_;
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__first_ = false;
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*__output_iter_ << __v;
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return *this;
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}
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_LIBCPP_HIDE_FROM_ABI ostream_joiner& operator*() _NOEXCEPT { return *this; }
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_LIBCPP_HIDE_FROM_ABI ostream_joiner& operator++() _NOEXCEPT { return *this; }
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_LIBCPP_HIDE_FROM_ABI ostream_joiner& operator++(int) _NOEXCEPT { return *this; }
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private:
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ostream_type* __output_iter_;
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_Delim __delim_;
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bool __first_;
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};
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template <class _CharT, class _Traits, class _Delim>
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_LIBCPP_HIDE_FROM_ABI ostream_joiner<__decay_t<_Delim>, _CharT, _Traits>
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make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os, _Delim&& __d) {
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return ostream_joiner<__decay_t<_Delim>, _CharT, _Traits>(__os, std::forward<_Delim>(__d));
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}
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_LIBCPP_END_NAMESPACE_LFTS
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# endif // _LIBCPP_STD_VER >= 14
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_LIBCPP_POP_MACROS
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# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
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# include <cstddef>
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# include <iosfwd>
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# include <type_traits>
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# endif
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_EXPERIMENTAL_ITERATOR
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