1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10
11// <optional>
12
13// template <class T> constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept;
14// template <class T> constexpr bool operator<=(nullopt_t, const optional<T>& x) noexcept;
15
16#include <optional>
17
18#include "test_macros.h"
19
20int main(int, char**)
21{
22 using std::optional;
23 using std::nullopt_t;
24 using std::nullopt;
25
26 {
27 typedef int T;
28 typedef optional<T> O;
29
30 constexpr O o1; // disengaged
31 constexpr O o2{1}; // engaged
32
33 static_assert ( (nullopt <= o1), "" );
34 static_assert ( (nullopt <= o2), "" );
35 static_assert ( (o1 <= nullopt), "" );
36 static_assert ( !(o2 <= nullopt), "" );
37
38 static_assert (noexcept(nullopt <= o1), "");
39 static_assert (noexcept(o1 <= nullopt), "");
40 }
41
42 return 0;
43}
44

source code of libcxx/test/std/utilities/optional/optional.nullops/less_equal.pass.cpp