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 // <algorithm>
11 
12 // template<ForwardIterator Iter, class T, CopyConstructible Compare>
13 //   requires Predicate<Compare, T, Iter::value_type>
14 //         && Predicate<Compare, Iter::value_type, T>
15 //   pair<Iter, Iter>
16 //   equal_range(Iter first, Iter last, const T& value, Compare comp);
17 
18 #include <algorithm>
19 #include <functional>
20 #include <vector>
21 #include <cassert>
22 
23 #include "test_iterators.h"
24 
25 template <class Iter, class T>
26 void
27 test(Iter first, Iter last, const T& value)
28 {
29     std::pair<Iter, Iter> i = std::equal_range(first, last, value, std::greater<int>());
30     for (Iter j = first; j != i.first; ++j)
31         assert(std::greater<int>()(*j, value));
32     for (Iter j = i.first; j != last; ++j)
33         assert(!std::greater<int>()(*j, value));
34     for (Iter j = first; j != i.second; ++j)
35         assert(!std::greater<int>()(value, *j));
36     for (Iter j = i.second; j != last; ++j)
37         assert(std::greater<int>()(value, *j));
38 }
39 
40 template <class Iter>
41 void
42 test()
43 {
44     const unsigned N = 1000;
45     const unsigned M = 10;
46     std::vector<int> v(N);
47     int x = 0;
48     for (int i = 0; i < v.size(); ++i)
49     {
50         v[i] = x;
51         if (++x == M)
52             x = 0;
53     }
54     std::sort(v.begin(), v.end(), std::greater<int>());
55     for (x = 0; x <= M; ++x)
56         test(Iter(v.data()), Iter(v.data()+v.size()), x);
57 }
58 
59 int main()
60 {
61     int d[] = {3, 2, 1, 0};
62     for (int* e = d; e <= d+4; ++e)
63         for (int x = -1; x <= 4; ++x)
64             test(d, e, x);
65 
66     test<forward_iterator<const int*> >();
67     test<bidirectional_iterator<const int*> >();
68     test<random_access_iterator<const int*> >();
69     test<const int*>();
70 }
71