xref: /minix3/external/bsd/libc++/dist/libcxx/test/strings/basic.string.hash/strings.pass.cpp (revision 4684ddb6aab0b36791c8099bc705d6140b3d05d0)
1*4684ddb6SLionel Sambuc //===----------------------------------------------------------------------===//
2*4684ddb6SLionel Sambuc //
3*4684ddb6SLionel Sambuc //                     The LLVM Compiler Infrastructure
4*4684ddb6SLionel Sambuc //
5*4684ddb6SLionel Sambuc // This file is dual licensed under the MIT and the University of Illinois Open
6*4684ddb6SLionel Sambuc // Source Licenses. See LICENSE.TXT for details.
7*4684ddb6SLionel Sambuc //
8*4684ddb6SLionel Sambuc //===----------------------------------------------------------------------===//
9*4684ddb6SLionel Sambuc 
10*4684ddb6SLionel Sambuc // <functional>
11*4684ddb6SLionel Sambuc 
12*4684ddb6SLionel Sambuc // template <class T>
13*4684ddb6SLionel Sambuc // struct hash
14*4684ddb6SLionel Sambuc //     : public unary_function<T, size_t>
15*4684ddb6SLionel Sambuc // {
16*4684ddb6SLionel Sambuc //     size_t operator()(T val) const;
17*4684ddb6SLionel Sambuc // };
18*4684ddb6SLionel Sambuc 
19*4684ddb6SLionel Sambuc // Not very portable
20*4684ddb6SLionel Sambuc 
21*4684ddb6SLionel Sambuc #include <string>
22*4684ddb6SLionel Sambuc #include <cassert>
23*4684ddb6SLionel Sambuc #include <type_traits>
24*4684ddb6SLionel Sambuc 
25*4684ddb6SLionel Sambuc template <class T>
26*4684ddb6SLionel Sambuc void
test()27*4684ddb6SLionel Sambuc test()
28*4684ddb6SLionel Sambuc {
29*4684ddb6SLionel Sambuc     typedef std::hash<T> H;
30*4684ddb6SLionel Sambuc     static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
31*4684ddb6SLionel Sambuc                                    H>::value), "");
32*4684ddb6SLionel Sambuc     H h;
33*4684ddb6SLionel Sambuc     std::string g1 = "1234567890";
34*4684ddb6SLionel Sambuc     std::string g2 = "1234567891";
35*4684ddb6SLionel Sambuc     T s1(g1.begin(), g1.end());
36*4684ddb6SLionel Sambuc     T s2(g2.begin(), g2.end());
37*4684ddb6SLionel Sambuc     assert(h(s1) != h(s2));
38*4684ddb6SLionel Sambuc }
39*4684ddb6SLionel Sambuc 
main()40*4684ddb6SLionel Sambuc int main()
41*4684ddb6SLionel Sambuc {
42*4684ddb6SLionel Sambuc     test<std::string>();
43*4684ddb6SLionel Sambuc #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
44*4684ddb6SLionel Sambuc     test<std::u16string>();
45*4684ddb6SLionel Sambuc     test<std::u32string>();
46*4684ddb6SLionel Sambuc #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
47*4684ddb6SLionel Sambuc     test<std::wstring>();
48*4684ddb6SLionel Sambuc }
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