common_type.pass.cpp revision dab89a1412fbb013d492c32387cf10fa67cd7981 
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// common_type
13
14#include <type_traits>
15
16int main()
17{
18    static_assert((std::is_same<std::common_type<int>::type, int>::value), "");
19    static_assert((std::is_same<std::common_type<char>::type, char>::value), "");
20#if _LIBCPP_STD_VER > 11
21    static_assert((std::is_same<std::common_type_t<int>,   int>::value), "");
22    static_assert((std::is_same<std::common_type_t<char>, char>::value), "");
23#endif
24
25    static_assert((std::is_same<std::common_type<               int>::type, int>::value), "");
26    static_assert((std::is_same<std::common_type<const          int>::type, int>::value), "");
27    static_assert((std::is_same<std::common_type<      volatile int>::type, int>::value), "");
28    static_assert((std::is_same<std::common_type<const volatile int>::type, int>::value), "");
29
30    static_assert((std::is_same<std::common_type<int,           int>::type, int>::value), "");
31    static_assert((std::is_same<std::common_type<int,     const int>::type, int>::value), "");
32
33    static_assert((std::is_same<std::common_type<long,       const int>::type, long>::value), "");
34    static_assert((std::is_same<std::common_type<const long,       int>::type, long>::value), "");
35    static_assert((std::is_same<std::common_type<long,    volatile int>::type, long>::value), "");
36    static_assert((std::is_same<std::common_type<volatile long,    int>::type, long>::value), "");
37    static_assert((std::is_same<std::common_type<const long, const int>::type, long>::value), "");
38
39    static_assert((std::is_same<std::common_type<double, char>::type, double>::value), "");
40    static_assert((std::is_same<std::common_type<short, char>::type, int>::value), "");
41#if _LIBCPP_STD_VER > 11
42    static_assert((std::is_same<std::common_type_t<double, char>, double>::value), "");
43    static_assert((std::is_same<std::common_type_t<short, char>, int>::value), "");
44#endif
45
46    static_assert((std::is_same<std::common_type<double, char, long long>::type, double>::value), "");
47    static_assert((std::is_same<std::common_type<unsigned, char, long long>::type, long long>::value), "");
48#if _LIBCPP_STD_VER > 11
49    static_assert((std::is_same<std::common_type_t<double, char, long long>, double>::value), "");
50    static_assert((std::is_same<std::common_type_t<unsigned, char, long long>, long long>::value), "");
51#endif
52}
53