01afa5c6e4
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@189772 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
819 B
C++
39 lines
819 B
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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <optional>
|
|
|
|
// constexpr const T& optional<T>::value() const;
|
|
|
|
#include <optional>
|
|
#include <type_traits>
|
|
#include <cassert>
|
|
|
|
#if _LIBCPP_STD_VER > 11
|
|
|
|
struct X
|
|
{
|
|
constexpr int test() const {return 3;}
|
|
int test() {return 4;}
|
|
};
|
|
|
|
#endif // _LIBCPP_STD_VER > 11
|
|
|
|
int main()
|
|
{
|
|
#if _LIBCPP_STD_VER > 11
|
|
{
|
|
constexpr std::optional<X> opt;
|
|
static_assert(opt.value().test() == 3, "");
|
|
}
|
|
#else
|
|
#error
|
|
#endif // _LIBCPP_STD_VER > 11
|
|
}
|