83 lines
2.1 KiB
C++
83 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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// <ostream>
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// template <class Stream, class T>
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// Stream&& operator<<(Stream&& os, const T& x);
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#include <ostream>
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#include <cassert>
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#include "test_macros.h"
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template <class CharT>
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class testbuf
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: public std::basic_streambuf<CharT>
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{
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typedef std::basic_streambuf<CharT> base;
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std::basic_string<CharT> str_;
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public:
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testbuf()
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{
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}
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std::basic_string<CharT> str() const
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{return std::basic_string<CharT>(base::pbase(), base::pptr());}
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protected:
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virtual typename base::int_type
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overflow(typename base::int_type ch = base::traits_type::eof())
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{
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if (ch != base::traits_type::eof())
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{
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int n = static_cast<int>(str_.size());
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str_.push_back(static_cast<CharT>(ch));
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str_.resize(str_.capacity());
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base::setp(const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data() + str_.size()));
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base::pbump(n+1);
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}
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return ch;
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}
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};
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struct Int {
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int value;
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template <class CharT>
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friend void operator<<(std::basic_ostream<CharT>& os, Int const& self) {
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os << self.value;
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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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testbuf<char> sb;
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std::ostream os(&sb);
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Int const i = {123};
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std::ostream&& result = (std::move(os) << i);
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assert(&result == &os);
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assert(sb.str() == "123");
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}
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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{
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testbuf<wchar_t> sb;
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std::wostream os(&sb);
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Int const i = {123};
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std::wostream&& result = (std::move(os) << i);
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assert(&result == &os);
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assert(sb.str() == L"123");
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}
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#endif
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return 0;
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}
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