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78 lines
1.5 KiB
C++
78 lines
1.5 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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// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
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// <optional>
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// constexpr T& optional<T>::value() &;
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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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using std::optional;
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using std::bad_optional_access;
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struct X
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{
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X() = default;
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X(const X&) = delete;
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constexpr int test() const & {return 3;}
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int test() & {return 4;}
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constexpr int test() const && {return 5;}
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int test() && {return 6;}
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};
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struct Y
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{
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constexpr int test() & {return 7;}
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};
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constexpr int
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test()
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{
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optional<Y> opt{Y{}};
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return opt.value().test();
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}
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int main(int, char**)
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{
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{
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optional<X> opt; ((void)opt);
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ASSERT_NOT_NOEXCEPT(opt.value());
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ASSERT_SAME_TYPE(decltype(opt.value()), X&);
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}
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{
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optional<X> opt;
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opt.emplace();
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assert(opt.value().test() == 4);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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optional<X> opt;
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try
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{
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(void)opt.value();
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assert(false);
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}
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catch (const bad_optional_access&)
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{
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}
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}
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#endif
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static_assert(test() == 7, "");
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return 0;
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}
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