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