38 lines
953 B
C++
38 lines
953 B
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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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// constexpr bool optional<T>::has_value() const noexcept;
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#include <optional>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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int main()
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{
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using std::optional;
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{
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const optional<int> opt; ((void)opt);
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ASSERT_NOEXCEPT(opt.has_value());
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ASSERT_SAME_TYPE(decltype(opt.has_value()), bool);
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}
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{
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constexpr optional<int> opt;
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static_assert(!opt.has_value(), "");
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}
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{
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constexpr optional<int> opt(0);
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static_assert(opt.has_value(), "");
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}
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}
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