73 lines
1.6 KiB
C++
73 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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
|
|
{
|
|
int test() noexcept {return 3;}
|
|
};
|
|
|
|
struct Y
|
|
{
|
|
constexpr int test() {return 3;}
|
|
};
|
|
|
|
constexpr int
|
|
test()
|
|
{
|
|
optional<Y> opt{Y{}};
|
|
return opt->test();
|
|
}
|
|
|
|
int main()
|
|
{
|
|
{
|
|
std::optional<X> opt; ((void)opt);
|
|
ASSERT_SAME_TYPE(decltype(opt.operator->()), X*);
|
|
// ASSERT_NOT_NOEXCEPT(opt.operator->());
|
|
// 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() == 3);
|
|
}
|
|
{
|
|
static_assert(test() == 3, "");
|
|
}
|
|
#ifdef _LIBCPP_DEBUG
|
|
{
|
|
optional<X> opt;
|
|
assert(opt->test() == 3);
|
|
assert(false);
|
|
}
|
|
#endif // _LIBCPP_DEBUG
|
|
}
|