pointer.pass.cpp revision f5256e16dfc425c1d466f6308d4026d529ce9e0b 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. 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    typedef typename std::remove_pointer<T>::type type;
34    type i;
35    type j;
36    assert(h(&i) != h(&j));
37}
38
39int main()
40{
41    test<int*>();
42}
43