| // Copyright (C) 2014-2023 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-do run { target c++17 } } |
| // { dg-require-cstdint "" } |
| |
| #include <algorithm> |
| #include <random> |
| #include <testsuite_hooks.h> |
| #include <testsuite_iterators.h> |
| |
| std::mt19937 rng; |
| |
| using std::sample; |
| using __gnu_test::test_container; |
| using __gnu_test::input_iterator_wrapper; |
| using __gnu_test::output_iterator_wrapper; |
| using __gnu_test::forward_iterator_wrapper; |
| using __gnu_test::random_access_iterator_wrapper; |
| |
| void |
| test01() |
| { |
| const int in[] = { 1, 2 }; |
| test_container<const int, random_access_iterator_wrapper> pop(in); |
| const int sample_size = 10; |
| int samp[sample_size] = { }; |
| |
| // population smaller than desired sample size |
| auto it = sample(pop.begin(), pop.end(), samp, sample_size, rng); |
| VERIFY( it == samp + std::distance(pop.begin(), pop.end()) ); |
| const auto sum = std::accumulate(pop.begin(), pop.end(), 0); |
| VERIFY( std::accumulate(samp, samp + sample_size, 0) == sum ); |
| } |
| |
| void |
| test02() |
| { |
| const int in[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }; |
| test_container<const int, random_access_iterator_wrapper> pop(in); |
| const int sample_size = 10; |
| int samp[sample_size] = { }; |
| |
| auto it = sample(pop.begin(), pop.end(), samp, sample_size, rng); |
| VERIFY( it == samp + sample_size ); |
| |
| // verify no duplicates |
| std::sort(samp, it); |
| auto it2 = std::unique(samp, it); |
| VERIFY( it2 == it ); |
| } |
| |
| void |
| test03() |
| { |
| const int in[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; |
| test_container<const int, input_iterator_wrapper> pop(in); |
| const int sample_size = 5; |
| int samp[sample_size] = { }; |
| |
| // input iterator for population |
| auto it = sample(pop.begin(), pop.end(), samp, sample_size, rng); |
| VERIFY( it == samp + sample_size ); |
| |
| // verify no duplicates |
| std::sort(samp, it); |
| auto it2 = std::unique(samp, it); |
| VERIFY( it2 == it ); |
| } |
| |
| void |
| test04() |
| { |
| const int in[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; |
| test_container<const int, forward_iterator_wrapper> pop(in); |
| const int sample_size = 5; |
| int out[sample_size]; |
| test_container<int, output_iterator_wrapper> samp(out); |
| |
| // forward iterator for population and output iterator for result |
| auto res = sample(pop.begin(), pop.end(), samp.begin(), sample_size, rng); |
| VERIFY( res.ptr == (out + sample_size) ); |
| |
| // verify no duplicates |
| std::sort(std::begin(out), std::end(out)); |
| auto it = std::unique(std::begin(out), std::end(out)); |
| VERIFY( it == std::end(out) ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test03(); |
| test04(); |
| } |