//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
#include <coroutine>
#include <type_traits>
#include <cassert>
#include <utility>
#include "test_macros.h"
constexpr bool check_suspend_constexpr() {
std::suspend_never s{};
const std::suspend_never scopy(s); ((void)scopy);
std::suspend_never smove(std::move(s)); ((void)smove);
s = scopy;
s = std::move(smove);
return true;
}
template<class T>
constexpr bool test_trivial_awaitable_constexpr(bool expected) {
T t;
assert(t.await_ready() == expected);
t.await_suspend(nullptr);
t.await_resume();
return true;
}
int main(int, char**)
{
using H = std::coroutine_handle<>;
using S = std::suspend_never;
H h{};
S s{};
S const& cs = s;
{
LIBCPP_STATIC_ASSERT(noexcept(s.await_ready()), "");
static_assert(std::is_same<decltype(s.await_ready()), bool>::value, "");
assert(s.await_ready() == true);
assert(cs.await_ready() == true);
}
{
LIBCPP_STATIC_ASSERT(noexcept(s.await_suspend(h)), "");
static_assert(std::is_same<decltype(s.await_suspend(h)), void>::value, "");
s.await_suspend(h);
cs.await_suspend(h);
}
{
LIBCPP_STATIC_ASSERT(noexcept(s.await_resume()), "");
static_assert(std::is_same<decltype(s.await_resume()), void>::value, "");
s.await_resume();
cs.await_resume();
}
{
static_assert(std::is_nothrow_default_constructible<std::suspend_never>::value, "");
static_assert(std::is_nothrow_copy_constructible<std::suspend_never>::value, "");
static_assert(std::is_nothrow_move_constructible<std::suspend_never>::value, "");
static_assert(std::is_nothrow_copy_assignable<std::suspend_never>::value, "");
static_assert(std::is_nothrow_move_assignable<std::suspend_never>::value, "");
static_assert(std::is_trivially_copyable<std::suspend_never>::value, "");
static_assert(check_suspend_constexpr(), "");
}
{
static_assert(test_trivial_awaitable_constexpr<std::suspend_never>(true));
}
return 0;
}