sources/cxx-stl/llvm-libc++/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     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.
//
//===----------------------------------------------------------------------===//

// type_traits

// underlying_type

#include <type_traits>
#include <climits>

enum E { V = INT_MIN };
enum F { W = UINT_MAX };

int main()
{
    static_assert((std::is_same<std::underlying_type<E>::type, int>::value),
                  "E has the wrong underlying type");
    static_assert((std::is_same<std::underlying_type<F>::type, unsigned>::value),
                  "F has the wrong underlying type");

#if _LIBCPP_STD_VER > 11
    static_assert((std::is_same<std::underlying_type_t<E>, int>::value), "");
    static_assert((std::is_same<std::underlying_type_t<F>, unsigned>::value), "");
#endif

#if __has_feature(cxx_strong_enums)
    enum G : char { };

    static_assert((std::is_same<std::underlying_type<G>::type, char>::value),
                  "G has the wrong underlying type");
#if _LIBCPP_STD_VER > 11
    static_assert((std::is_same<std::underlying_type_t<G>, char>::value), "");
#endif
#endif // __has_feature(cxx_strong_enums)
}