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8d9254fc | 1 | // Copyright (C) 2013-2020 Free Software Foundation, Inc. |
c2240038 CJ |
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 | ||
18a20f3f JW |
18 | // { dg-options "-DSIMULATOR_TEST" { target simulator } } |
19 | // { dg-do run { target c++11 } } | |
c2240038 CJ |
20 | // { dg-require-cstdint "" } |
21 | ||
22 | // 25.4.2 [lib.alg.nth.element] | |
23 | ||
24 | #include <algorithm> | |
25 | #include <random> | |
26 | #include <testsuite_hooks.h> | |
27 | #include <testsuite_iterators.h> | |
28 | #include <testsuite_containergen.h> | |
29 | ||
30 | using __gnu_test::test_container; | |
31 | using __gnu_test::random_access_iterator_wrapper; | |
32 | ||
33 | typedef test_container<int, random_access_iterator_wrapper> Container; | |
34 | ||
35 | struct testNthElement | |
36 | { | |
37 | template<typename Container, typename RandomGen> | |
38 | void operator()(Container con, RandomGen& rg) | |
39 | { | |
c2240038 CJ |
40 | const int size = con.end() - con.begin(); |
41 | auto dist = std::uniform_int_distribution<>(0, size); | |
42 | const int element = dist(rg); | |
43 | ||
44 | std::nth_element(con.begin(), con.begin() + element, con.end()); | |
45 | ||
46 | if (element < size) | |
47 | { | |
48 | for (int i = 0; i < element; ++i) | |
49 | VERIFY( con.val(i) <= con.val(element) ); | |
50 | ||
51 | for (int i = element + 1; i < size; ++i) | |
52 | VERIFY( con.val(i) >= con.val(element) ); | |
53 | } | |
54 | } | |
55 | }; | |
56 | ||
57 | int | |
58 | main() | |
59 | { | |
60 | __gnu_test::test_containers<Container>(testNthElement()); | |
61 | } |