forked from OSchip/llvm-project
85 lines
2.1 KiB
C++
85 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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// <istream>
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// template <class Stream, class T>
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// Stream&& operator>>(Stream&& is, T&& x);
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#include <istream>
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#include <sstream>
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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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struct testbuf
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: public std::basic_streambuf<CharT>
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{
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typedef std::basic_string<CharT> string_type;
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typedef std::basic_streambuf<CharT> base;
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private:
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string_type str_;
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public:
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testbuf() {}
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testbuf(const string_type& str)
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: str_(str)
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{
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base::setg(const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()) + str_.size());
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}
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CharT* eback() const {return base::eback();}
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CharT* gptr() const {return base::gptr();}
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CharT* egptr() const {return base::egptr();}
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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_istream<CharT>& is, Int& self) {
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is >> self.value;
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}
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};
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struct A { };
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bool called = false;
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void operator>>(std::istream&, A&&) { called = true; }
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int main(int, char**)
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{
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{
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testbuf<char> sb(" 123");
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Int i = {0};
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std::istream is(&sb);
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std::istream&& result = (std::move(is) >> i);
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assert(&result == &is);
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assert(i.value == 123);
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}
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{
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testbuf<wchar_t> sb(L" 123");
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Int i = {0};
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std::wistream is(&sb);
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std::wistream&& result = (std::move(is) >> i);
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assert(&result == &is);
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assert(i.value == 123);
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}
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{
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// test perfect forwarding
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assert(called == false);
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std::istringstream ss;
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std::istringstream&& result = (std::move(ss) >> A());
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assert(&result == &ss);
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assert(called);
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}
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return 0;
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}
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