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.
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
//===----------------------------------------------------------------------===//
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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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// <sstream>
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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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// explicit basic_stringbuf(ios_base::openmode which = ios_base::in | ios_base::out); // before C++20
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// basic_stringbuf() : basic_stringbuf(ios_base::in | ios_base::out) {} // C++20
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// explicit basic_stringbuf(ios_base::openmode which); // C++20
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// XFAIL: FROZEN-CXX03-HEADERS-FIXME
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#include <sstream>
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#include <cassert>
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#include "test_macros.h"
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#if TEST_STD_VER >= 11
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#include "test_convertible.h"
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#endif
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template<typename CharT>
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struct testbuf
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: std::basic_stringbuf<CharT>
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{
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void check()
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{
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// LWG2995
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// It is implementation-defined whether the sequence pointers (eback(),
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// gptr(), egptr(), pbase(), pptr(), epptr()) are initialized to null
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// pointers.
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// This tests the libc++ specific implementation.
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LIBCPP_ASSERT(this->eback() != nullptr);
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LIBCPP_ASSERT(this->gptr() != nullptr);
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LIBCPP_ASSERT(this->egptr() != nullptr);
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LIBCPP_ASSERT(this->pbase() != nullptr);
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LIBCPP_ASSERT(this->pptr() != nullptr);
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LIBCPP_ASSERT(this->epptr() != nullptr);
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assert(this->str().empty());
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}
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};
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int main(int, char**)
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{
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{
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std::stringbuf buf;
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assert(buf.str() == "");
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}
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{
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testbuf<char> buf;
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buf.check();
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}
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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{
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std::wstringbuf buf;
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assert(buf.str() == L"");
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}
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{
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testbuf<wchar_t> buf;
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buf.check();
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}
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#endif
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#if TEST_STD_VER >= 11
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{
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typedef std::stringbuf B;
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static_assert(test_convertible<B>(), "");
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static_assert(!test_convertible<B, std::ios_base::openmode>(), "");
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}
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#endif
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return 0;
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}
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