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 // <functional>
11
12 // make sure that we can hash enumeration values
13 // Not very portable
14
15 #include <__config>
16
17 #if _LIBCPP_STD_VER > 11
18
19 #include <functional>
20 #include <cassert>
21 #include <type_traits>
22 #include <limits>
23
24 enum class Colors { red, orange, yellow, green, blue, indigo, violet };
25 enum class Cardinals { zero, one, two, three, five=5 };
26 enum class LongColors : short { red, orange, yellow, green, blue, indigo, violet };
27 enum class ShortColors : long { red, orange, yellow, green, blue, indigo, violet };
28 enum class EightBitColors : uint8_t { red, orange, yellow, green, blue, indigo, violet };
29
30 enum Fruits { apple, pear, grape, mango, cantaloupe };
31
32 template <class T>
33 void
test()34 test()
35 {
36 static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
37 std::hash<T> >::value), "");
38 typedef typename std::underlying_type<T>::type under_type;
39
40 std::hash<T> h1;
41 std::hash<under_type> h2;
42 for (int i = 0; i <= 5; ++i)
43 {
44 T t(static_cast<T> (i));
45 if (sizeof(T) <= sizeof(std::size_t))
46 assert(h1(t) == h2(static_cast<under_type>(i)));
47 }
48 }
49
main()50 int main()
51 {
52 test<Cardinals>();
53
54 test<Colors>();
55 test<ShortColors>();
56 test<LongColors>();
57 test<EightBitColors>();
58
59 test<Fruits>();
60 }
61 #else
main()62 int main () {}
63 #endif
64