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 <string>
22#include <cassert>
23#include <type_traits>
24
25template <class T>
26void
27test()
28{
29    typedef std::hash<T> H;
30    static_assert((std::is_same<typename H::argument_type, T>::value), "" );
31    static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
32    H h;
33    std::string g1 = "1234567890";
34    std::string g2 = "1234567891";
35    T s1(g1.begin(), g1.end());
36    T s2(g2.begin(), g2.end());
37    assert(h(s1) != h(s2));
38}
39
40int main()
41{
42    test<std::string>();
43#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
44    test<std::u16string>();
45    test<std::u32string>();
46#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
47    test<std::wstring>();
48}
49