1// Copyright (C) 2005, 2009 Free Software Foundation, Inc.
2//
3// This file is part of the GNU ISO C++ Library.  This library is free
4// software; you can redistribute it and/or modify it under the
5// terms of the GNU General Public License as published by the
6// Free Software Foundation; either version 3, or (at your option)
7// any later version.
8
9// This library is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12// GNU General Public License for more details.
13
14// You should have received a copy of the GNU General Public License along
15// with this library; see the file COPYING3.  If not see
16// <http://www.gnu.org/licenses/>.
17
18// 25.3.2 [lib.alg.nth.element]
19
20#include <algorithm>
21#include <testsuite_hooks.h>
22#include <testsuite_iterators.h>
23
24using __gnu_test::test_container;
25using __gnu_test::random_access_iterator_wrapper;
26using std::nth_element;
27using std::partial_sort;
28
29typedef test_container<int, random_access_iterator_wrapper> Container;
30
31void
32test1()
33{
34  int array[]={0};
35  Container con(array, array);
36  partial_sort(con.begin(), con.begin(), con.end());
37}
38
39void
40test2()
41{
42  int array[]={2,1,0};
43  Container con(array, array + 2);
44  partial_sort(con.begin(), con.begin(), con.end());
45  partial_sort(con.begin(), con.end(), con.end());
46}
47
48void
49test3()
50{
51  bool test __attribute__((unused)) = true;
52  int array[] = {6, 5, 4, 3, 2, 1, 0};
53  Container con(array, array + 7);
54  nth_element(con.begin(), con.it(3), con.end());
55  for(int i = 0; i < 3; ++i)
56    VERIFY(array[i] < array[3]);
57  for(int i = 4; i < 7; ++i)
58    VERIFY(array[3] < array[i]);
59}
60
61void
62test4()
63{
64  bool test __attribute__((unused)) = true;
65  int array[] = {0, 6, 1, 5, 2, 4, 3};
66  Container con(array,array + 7);
67  nth_element(con.begin(), con.it(3), con.end());
68  for(int i = 0; i < 3; ++i)
69    VERIFY(array[i] < array[3]);
70  for(int i = 4; i < 7; ++i)
71    VERIFY(array[3] < array[i]);
72}
73
74int
75main()
76{
77  test1();
78  test2();
79  test3();
80  test4();
81}
82