100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
// Copyright (C) 2014-2015 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-options "-std=gnu++14" }
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#include <experimental/algorithm>
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#include <iterator>
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#include <sstream>
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#include <forward_list>
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#include <vector>
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#include <testsuite_hooks.h>
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std::mt19937 rng;
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using std::experimental::sample;
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using std::istream_iterator;
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using std::ostream_iterator;
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void
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test01()
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{
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const int pop[] = { 1, 2 };
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int samp[10] = { };
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// population smaller than desired sample size
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auto it = sample(pop, pop + 2, samp, 10, rng);
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VERIFY( it == samp + 2 );
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VERIFY( std::accumulate(samp, samp + 10, 0) == 3 );
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}
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void
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test02()
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{
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const int pop[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
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int samp[10] = { };
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auto it = sample(pop, std::end(pop), samp, 10, rng);
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VERIFY( it == samp + 10 );
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std::sort(samp, it);
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auto it2 = std::unique(samp, it);
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VERIFY( it2 == it );
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}
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void
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test03()
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{
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std::istringstream pop("0 1 2 3 4 5 6 7 8 9");
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int samp[5] = { };
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// input iterator for population
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auto it = sample(istream_iterator<int>{pop}, {}, samp, 5, rng);
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VERIFY( it == samp + 5 );
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std::sort(samp, it);
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auto it2 = std::unique(samp, it);
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VERIFY( it2 == it );
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}
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void
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test04()
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{
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std::forward_list<int> pop{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
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std::stringstream samp;
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// forward iterator for population and output iterator for result
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sample(pop.begin(), pop.end(), ostream_iterator<int>{samp, " "}, 5, rng);
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// samp.rdbuf()->pubseekoff(0, std::ios::beg);
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std::vector<int> v(istream_iterator<int>{samp}, {});
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VERIFY( v.size() == 5 );
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std::sort(v.begin(), v.end());
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auto it = std::unique(v.begin(), v.end());
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VERIFY( it == v.end() );
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}
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int
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main()
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{
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test01();
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test02();
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test03();
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test04();
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}
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