underlying_type.pass.cpp revision 933afa9761c1c1f916161278a99284d50a594939 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// type_traits
11
12// underlying_type
13
14#include <type_traits>
15#include <climits>
16
17enum E { V = INT_MIN };
18enum F { W = UINT_MAX };
19
20int main()
21{
22    static_assert((std::is_same<std::underlying_type<E>::type, int>::value),
23                  "E has the wrong underlying type");
24    static_assert((std::is_same<std::underlying_type<F>::type, unsigned>::value),
25                  "F has the wrong underlying type");
26
27#if _LIBCPP_STD_VER > 11
28    static_assert((std::is_same<std::underlying_type_t<E>, int>::value), "");
29    static_assert((std::is_same<std::underlying_type_t<F>, unsigned>::value), "");
30#endif
31
32#if __has_feature(cxx_strong_enums)
33    enum G : char { };
34
35    static_assert((std::is_same<std::underlying_type<G>::type, char>::value),
36                  "G has the wrong underlying type");
37#if _LIBCPP_STD_VER > 11
38    static_assert((std::is_same<std::underlying_type_t<G>, char>::value), "");
39#endif
40#endif // __has_feature(cxx_strong_enums)
41}
42