blob: b32c90dcba621dfcc5a8949a1aacd0ac1d92e909 [file] [log] [blame]
// Copyright (C) 2020-2022 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
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <coroutine>
void
test01()
{
// LWG 3460. Unimplementable noop_coroutine_handle guarantees
static_assert( std::is_convertible_v<std::noop_coroutine_handle&,
std::coroutine_handle<>> );
static_assert( ! std::is_convertible_v<std::noop_coroutine_handle&,
std::coroutine_handle<>&> );
static_assert( ! std::is_assignable_v<std::noop_coroutine_handle&,
std::coroutine_handle<>> );
std::noop_coroutine_handle h = std::noop_coroutine();
std::coroutine_handle<> h2 = h;
h2(); // no-op
h2.resume(); // no-op
h2.destroy(); // no-op
}
void
test02()
{
// LWG 3469. Precondition of coroutine_handle::promise may be insufficient
struct P1 { };
struct P2 { };
static_assert( ! std::is_assignable_v<std::coroutine_handle<P1>&,
std::coroutine_handle<>> );
static_assert( ! std::is_assignable_v<std::coroutine_handle<P1>&,
std::coroutine_handle<P2>> );
}