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907c1196a7
Libc++ is used as a system library on macOS and iOS (amongst others). In order for users to be able to compile a binary that is intended to be deployed to an older version of the platform, clang provides the availability attribute <https://clang.llvm.org/docs/AttributeReference.html#availability>_ that can be placed on declarations to describe the lifecycle of a symbol in the library. See docs/DesignDocs/AvailabilityMarkup.rst for more information. Differential Revision: https://reviews.llvm.org/D31739 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@302172 91177308-0d34-0410-b5e6-96231b3b80d8
80 lines
1.7 KiB
C++
80 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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// <optional>
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// XFAIL: with_system_cxx_lib=macosx10.12
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// XFAIL: with_system_cxx_lib=macosx10.11
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// XFAIL: with_system_cxx_lib=macosx10.10
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// XFAIL: with_system_cxx_lib=macosx10.9
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// XFAIL: with_system_cxx_lib=macosx10.7
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// XFAIL: with_system_cxx_lib=macosx10.8
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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 std::move(opt).value().test();
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}
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int main()
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{
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{
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optional<X> opt; ((void)opt);
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ASSERT_NOT_NOEXCEPT(std::move(opt).value());
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ASSERT_SAME_TYPE(decltype(std::move(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(std::move(opt).value().test() == 6);
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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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std::move(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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}
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