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// template <class T>
13// struct hash
14//     : public unary_function<T, size_t>
15// {
16//     size_t operator()(T val) const;
17// };
18
19// Not very portable
20
21#include <functional>
22#include <cassert>
23#include <type_traits>
24#include <limits>
25
26template <class T>
27void
28test()
29{
30    typedef std::hash<T> H;
31    static_assert((std::is_same<typename H::argument_type, T>::value), "" );
32    static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
33    H h;
34
35    for (int i = 0; i <= 5; ++i)
36    {
37        T t(i);
38        if (sizeof(T) <= sizeof(std::size_t))
39            assert(h(t) == t);
40    }
41}
42
43int main()
44{
45    test<bool>();
46    test<char>();
47    test<signed char>();
48    test<unsigned char>();
49    test<char16_t>();
50    test<char32_t>();
51    test<wchar_t>();
52    test<short>();
53    test<unsigned short>();
54    test<int>();
55    test<unsigned int>();
56    test<long>();
57    test<unsigned long>();
58    test<long long>();
59    test<unsigned long long>();
60}
61