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43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <optional>
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// template <class T> constexpr bool operator<(const optional<T>& x, nullopt_t) noexcept;
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// template <class T> constexpr bool operator<(nullopt_t, const optional<T>& x) noexcept;
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#include <optional>
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#include "test_macros.h"
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int main(int, char**)
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{
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using std::optional;
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using std::nullopt_t;
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using std::nullopt;
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{
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typedef int T;
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typedef optional<T> O;
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constexpr O o1; // disengaged
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constexpr O o2{1}; // engaged
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static_assert ( !(nullopt < o1), "" );
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static_assert ( (nullopt < o2), "" );
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static_assert ( !(o1 < nullopt), "" );
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static_assert ( !(o2 < nullopt), "" );
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static_assert (noexcept(nullopt < o1), "");
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static_assert (noexcept(o1 < nullopt), "");
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}
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return 0;
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}
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