f4c1258d56
Some embedded platforms do not wish to support the C library functionality for handling wchar_t because they have no use for it. It makes sense for libc++ to work properly on those platforms, so this commit adds a carve-out of functionality for wchar_t. Unfortunately, unlike some other carve-outs (e.g. random device), this patch touches several parts of the library. However, despite the wide impact of this patch, I still think it is important to support this configuration since it makes it much simpler to port libc++ to some embedded platforms. Differential Revision: https://reviews.llvm.org/D111265
72 lines
1.8 KiB
C++
72 lines
1.8 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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#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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assert(this->eback() == NULL);
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assert(this->gptr() == NULL);
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assert(this->egptr() == NULL);
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assert(this->pbase() == NULL);
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assert(this->pptr() == NULL);
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assert(this->epptr() == NULL);
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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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