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74 lines
1.7 KiB
C++
74 lines
1.7 KiB
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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// XFAIL: availability=macosx10.13
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// XFAIL: availability=macosx10.12
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// XFAIL: availability=macosx10.11
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// XFAIL: availability=macosx10.10
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// XFAIL: availability=macosx10.9
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// XFAIL: availability=macosx10.8
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// XFAIL: availability=macosx10.7
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// <optional>
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// constexpr const T& optional<T>::value() const &;
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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::in_place_t;
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using std::in_place;
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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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int main()
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{
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{
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const 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 const&);
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}
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{
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constexpr optional<X> opt(in_place);
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static_assert(opt.value().test() == 3, "");
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}
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{
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const optional<X> opt(in_place);
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assert(opt.value().test() == 3);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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const 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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}
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