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.
192 lines
6.7 KiB
C++
192 lines
6.7 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_IOSFWD
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#define _LIBCPP_IOSFWD
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/*
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iosfwd synopsis
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namespace std
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{
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template<class charT> struct char_traits;
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template<> struct char_traits<char>;
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template<> struct char_traits<char8_t>; // C++20
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template<> struct char_traits<char16_t>;
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template<> struct char_traits<char32_t>;
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template<> struct char_traits<wchar_t>;
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template<class T> class allocator;
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template <class charT, class traits = char_traits<charT> > class basic_ios;
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template <class charT, class traits = char_traits<charT> > class basic_streambuf;
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template <class charT, class traits = char_traits<charT> > class basic_istream;
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template <class charT, class traits = char_traits<charT> > class basic_ostream;
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template <class charT, class traits = char_traits<charT> > class basic_iostream;
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template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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class basic_stringbuf;
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template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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class basic_istringstream;
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template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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class basic_ostringstream;
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template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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class basic_stringstream;
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template <class charT, class traits = char_traits<charT> > class basic_filebuf;
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template <class charT, class traits = char_traits<charT> > class basic_ifstream;
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template <class charT, class traits = char_traits<charT> > class basic_ofstream;
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template <class charT, class traits = char_traits<charT> > class basic_fstream;
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template <class charT, class traits = char_traits<charT> > class istreambuf_iterator;
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template <class charT, class traits = char_traits<charT> > class ostreambuf_iterator;
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typedef basic_ios<char> ios;
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typedef basic_ios<wchar_t> wios;
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typedef basic_streambuf<char> streambuf;
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typedef basic_istream<char> istream;
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typedef basic_ostream<char> ostream;
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typedef basic_iostream<char> iostream;
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typedef basic_stringbuf<char> stringbuf;
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typedef basic_istringstream<char> istringstream;
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typedef basic_ostringstream<char> ostringstream;
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typedef basic_stringstream<char> stringstream;
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typedef basic_filebuf<char> filebuf;
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typedef basic_ifstream<char> ifstream;
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typedef basic_ofstream<char> ofstream;
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typedef basic_fstream<char> fstream;
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typedef basic_streambuf<wchar_t> wstreambuf;
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typedef basic_istream<wchar_t> wistream;
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typedef basic_ostream<wchar_t> wostream;
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typedef basic_iostream<wchar_t> wiostream;
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typedef basic_stringbuf<wchar_t> wstringbuf;
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typedef basic_istringstream<wchar_t> wistringstream;
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typedef basic_ostringstream<wchar_t> wostringstream;
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typedef basic_stringstream<wchar_t> wstringstream;
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typedef basic_filebuf<wchar_t> wfilebuf;
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typedef basic_ifstream<wchar_t> wifstream;
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typedef basic_ofstream<wchar_t> wofstream;
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typedef basic_fstream<wchar_t> wfstream;
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template <class state> class fpos;
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using streampos = fpos<char_traits<char>::state_type>;
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using wstreampos = fpos<char_traits<wchar_t>::state_type>;
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using u8streampos = fpos<char_traits<char8_t>::state_type>; // C++20
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using u16streampos = fpos<char_traits<char16_t>::state_type>;
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using u32streampos = fpos<char_traits<char32_t>::state_type>;
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template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>
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class basic_syncbuf; // C++20
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using syncbuf = basic_syncbuf<char>; // C++20
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using wsyncbuf = basic_syncbuf<wchar_t>; // C++20
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template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>
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class basic_osyncstream; // C++20
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using osyncstream = basic_osyncstream<char>; // C++20
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using wosyncstream = basic_osyncstream<wchar_t>; // C++20
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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/iosfwd>
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#else
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# include <__config>
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# include <__fwd/fstream.h>
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# include <__fwd/ios.h>
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# include <__fwd/istream.h>
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# include <__fwd/memory.h>
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# include <__fwd/ostream.h>
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# include <__fwd/sstream.h>
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# include <__fwd/streambuf.h>
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# include <__fwd/string.h>
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# include <__std_mbstate_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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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _CharT, class _Traits = char_traits<_CharT> >
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class _LIBCPP_TEMPLATE_VIS istreambuf_iterator;
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template <class _CharT, class _Traits = char_traits<_CharT> >
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class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator;
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template <class _State>
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class _LIBCPP_TEMPLATE_VIS fpos;
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typedef fpos<mbstate_t> streampos;
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# if _LIBCPP_HAS_WIDE_CHARACTERS
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typedef fpos<mbstate_t> wstreampos;
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# endif
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# if _LIBCPP_HAS_CHAR8_T
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typedef fpos<mbstate_t> u8streampos;
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# endif
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typedef fpos<mbstate_t> u16streampos;
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typedef fpos<mbstate_t> u32streampos;
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# if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_SYNCSTREAM)
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template <class _CharT, class _Traits = char_traits<_CharT>, class _Allocator = allocator<_CharT>>
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class basic_syncbuf;
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using syncbuf = basic_syncbuf<char>;
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# if _LIBCPP_HAS_WIDE_CHARACTERS
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using wsyncbuf = basic_syncbuf<wchar_t>;
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# endif
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template <class _CharT, class _Traits = char_traits<_CharT>, class _Allocator = allocator<_CharT>>
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class basic_osyncstream;
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using osyncstream = basic_osyncstream<char>;
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# if _LIBCPP_HAS_WIDE_CHARACTERS
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using wosyncstream = basic_osyncstream<wchar_t>;
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# endif
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# endif // _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_SYNCSTREAM)
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template <class _CharT, class _Traits>
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class __save_flags {
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typedef basic_ios<_CharT, _Traits> __stream_type;
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typedef typename __stream_type::fmtflags fmtflags;
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__stream_type& __stream_;
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fmtflags __fmtflags_;
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_CharT __fill_;
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public:
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__save_flags(const __save_flags&) = delete;
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__save_flags& operator=(const __save_flags&) = delete;
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_LIBCPP_HIDE_FROM_ABI explicit __save_flags(__stream_type& __stream)
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: __stream_(__stream), __fmtflags_(__stream.flags()), __fill_(__stream.fill()) {}
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_LIBCPP_HIDE_FROM_ABI ~__save_flags() {
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__stream_.flags(__fmtflags_);
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__stream_.fill(__fill_);
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}
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};
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_LIBCPP_END_NAMESPACE_STD
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_IOSFWD
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