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, StrictWeakOrder<auto, Iter::value_type> Compare>
13 // requires CopyConstructible<Compare>
14 // pair<Iter, Iter>
15 // minmax_element(Iter first, Iter last, Compare comp);
16
17 #include <algorithm>
18 #include <functional>
19 #include <cassert>
20
21 #include "test_iterators.h"
22
23 template <class Iter>
24 void
test(Iter first,Iter last)25 test(Iter first, Iter last)
26 {
27 typedef std::greater<int> Compare;
28 Compare comp;
29 std::pair<Iter, Iter> p = std::minmax_element(first, last, comp);
30 if (first != last)
31 {
32 for (Iter j = first; j != last; ++j)
33 {
34 assert(!comp(*j, *p.first));
35 assert(!comp(*p.second, *j));
36 }
37 }
38 else
39 {
40 assert(p.first == last);
41 assert(p.second == last);
42 }
43 }
44
45 template <class Iter>
46 void
test(unsigned N)47 test(unsigned N)
48 {
49 int* a = new int[N];
50 for (int i = 0; i < N; ++i)
51 a[i] = i;
52 std::random_shuffle(a, a+N);
53 test(Iter(a), Iter(a+N));
54 delete [] a;
55 }
56
57 template <class Iter>
58 void
test()59 test()
60 {
61 test<Iter>(0);
62 test<Iter>(1);
63 test<Iter>(2);
64 test<Iter>(3);
65 test<Iter>(10);
66 test<Iter>(1000);
67 {
68 const unsigned N = 100;
69 int* a = new int[N];
70 for (int i = 0; i < N; ++i)
71 a[i] = 5;
72 std::random_shuffle(a, a+N);
73 typedef std::greater<int> Compare;
74 Compare comp;
75 std::pair<Iter, Iter> p = std::minmax_element(Iter(a), Iter(a+N), comp);
76 assert(base(p.first) == a);
77 assert(base(p.second) == a+N-1);
78 delete [] a;
79 }
80 }
81
main()82 int main()
83 {
84 test<forward_iterator<const int*> >();
85 test<bidirectional_iterator<const int*> >();
86 test<random_access_iterator<const int*> >();
87 test<const int*>();
88 }
89