// { dg-do run { target c++11 } }
// Copyright (C) 2016-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// .
// C++11 27.7.3.9 Rvalue stream insertion [ostream.rvalue]
#include
template
struct is_insertable
: std::false_type
{ };
template using void_t = void;
template
using insert_result
= decltype(std::declval() << std::declval());
template
struct is_insertable>>
: std::true_type
{ };
struct X {};
std::wostream& operator<<(std::wostream&, const X&) = delete;
struct Y {};
std::wostream& operator<<(std::wostream& os, const Y&) {return os;}
std::wostream& operator<<(std::wostream&& os, const Y&) {return os;}
struct Z{};
void test01()
{
Y y;
std::wostringstream os;
os << y;
os << Y();
std::wostringstream() << y;
std::wostringstream() << Y();
static_assert(!is_insertable::value, "");
static_assert(!is_insertable::value, "");
static_assert(!is_insertable::value, "");
static_assert(!is_insertable::value, "");
static_assert(is_insertable::value, "");
static_assert(is_insertable::value, "");
static_assert(is_insertable::value, "");
static_assert(is_insertable::value, "");
static_assert(!is_insertable::value, "");
static_assert(!is_insertable::value, "");
static_assert(!is_insertable::value, "");
static_assert(!is_insertable::value, "");
}
int main()
{
test01();
}