integral.pass.cpp revision 40c13d31c580d904d0c400f6bab1addf1535cf69 
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    static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
31                                   std::hash<T> >::value), "");
32    std::hash<T> h;
33    for (int i = 0; i <= 5; ++i)
34    {
35        T t(i);
36        if (sizeof(T) <= sizeof(std::size_t))
37            assert(h(t) == t);
38    }
39}
40
41int main()
42{
43    test<bool>();
44    test<char>();
45    test<signed char>();
46    test<unsigned char>();
47    test<char16_t>();
48    test<char32_t>();
49    test<wchar_t>();
50    test<short>();
51    test<unsigned short>();
52    test<int>();
53    test<unsigned int>();
54    test<long>();
55    test<unsigned long>();
56    test<long long>();
57    test<unsigned long long>();
58}
59