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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// XFAIL: with_system_cxx_lib=macosx10.12
// XFAIL: with_system_cxx_lib=macosx10.11
// XFAIL: with_system_cxx_lib=macosx10.10
// XFAIL: with_system_cxx_lib=macosx10.9
// XFAIL: with_system_cxx_lib=macosx10.7
// XFAIL: with_system_cxx_lib=macosx10.8
// <optional>
// constexpr T& optional<T>::value() &;
#include <optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
using std::optional;
using std::bad_optional_access;
struct X
{
X() = default;
X(const X&) = delete;
constexpr int test() const & {return 3;}
int test() & {return 4;}
constexpr int test() const && {return 5;}
int test() && {return 6;}
};
struct Y
{
constexpr int test() & {return 7;}
};
constexpr int
test()
{
optional<Y> opt{Y{}};
return opt.value().test();
}
int main()
{
{
optional<X> opt; ((void)opt);
ASSERT_NOT_NOEXCEPT(opt.value());
ASSERT_SAME_TYPE(decltype(opt.value()), X&);
}
{
optional<X> opt;
opt.emplace();
assert(opt.value().test() == 4);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
optional<X> opt;
try
{
(void)opt.value();
assert(false);
}
catch (const bad_optional_access&)
{
}
}
#endif
static_assert(test() == 7, "");
}
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