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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
// struct nullopt_t{see below};
// inline constexpr nullopt_t nullopt(unspecified);
// [optional.nullopt]/2:
// Type nullopt_t shall not have a default constructor or an initializer-list
// constructor, and shall not be an aggregate.
#include <optional>
#include <type_traits>
#include "test_macros.h"
using std::nullopt_t;
using std::nullopt;
constexpr bool test()
nullopt_t foo{nullopt};
return true;
int main(int, char**)
static_assert(std::is_same_v<const nullopt_t, decltype(nullopt)>);
return 0;