You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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++98, c++03, c++11, c++14
|
|
|
|
// <optional>
|
|
|
|
// template <class T> constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept;
|
|
// template <class T> constexpr bool operator<=(nullopt_t, const optional<T>& x) noexcept;
|
|
|
|
#include <optional>
|
|
|
|
#include "test_macros.h"
|
|
|
|
int main(int, char**)
|
|
{
|
|
using std::optional;
|
|
using std::nullopt_t;
|
|
using std::nullopt;
|
|
|
|
{
|
|
typedef int T;
|
|
typedef optional<T> O;
|
|
|
|
constexpr O o1; // disengaged
|
|
constexpr O o2{1}; // engaged
|
|
|
|
static_assert ( (nullopt <= o1), "" );
|
|
static_assert ( (nullopt <= o2), "" );
|
|
static_assert ( (o1 <= nullopt), "" );
|
|
static_assert ( !(o2 <= nullopt), "" );
|
|
|
|
static_assert (noexcept(nullopt <= o1), "");
|
|
static_assert (noexcept(o1 <= nullopt), "");
|
|
}
|
|
|
|
return 0;
|
|
}
|