blob: 4087cfdf104e0b465aba554b75945c55ae1276f5 [file] [log] [blame]
//===----------------------------------------------------------------------===//
//
// 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
// <optional>
// constexpr T& optional<T>::operator*() &;
#ifdef _LIBCPP_DEBUG
#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
#endif
#include <optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
using std::optional;
struct X
{
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).test();
}
int main()
{
{
optional<X> opt; ((void)opt);
ASSERT_SAME_TYPE(decltype(*opt), X&);
// ASSERT_NOT_NOEXCEPT(*opt);
// FIXME: This assertion fails with GCC because it can see that
// (A) operator*() is constexpr, and
// (B) there is no path through the function that throws.
// It's arguable if this is the correct behavior for the noexcept
// operator.
// Regardless this function should still be noexcept(false) because
// it has a narrow contract.
}
{
optional<X> opt(X{});
assert((*opt).test() == 4);
}
static_assert(test() == 7, "");
#ifdef _LIBCPP_DEBUG
{
optional<X> opt;
assert((*opt).test() == 3);
assert(false);
}
#endif // _LIBCPP_DEBUG
}