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// Copyright (C) 2014-2015 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-options "-std=gnu++14" }
#include <experimental/algorithm>
#include <iterator>
#include <sstream>
#include <forward_list>
#include <vector>
#include <testsuite_hooks.h>
std::mt19937 rng;
using std::experimental::sample;
using std::istream_iterator;
using std::ostream_iterator;
void
test01()
{
const int pop[] = { 1, 2 };
int samp[10] = { };
// population smaller than desired sample size
auto it = sample(pop, pop + 2, samp, 10, rng);
VERIFY( it == samp + 2 );
VERIFY( std::accumulate(samp, samp + 10, 0) == 3 );
}
void
test02()
{
const int pop[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
int samp[10] = { };
auto it = sample(pop, std::end(pop), samp, 10, rng);
VERIFY( it == samp + 10 );
std::sort(samp, it);
auto it2 = std::unique(samp, it);
VERIFY( it2 == it );
}
void
test03()
{
std::istringstream pop("0 1 2 3 4 5 6 7 8 9");
int samp[5] = { };
// input iterator for population
auto it = sample(istream_iterator<int>{pop}, {}, samp, 5, rng);
VERIFY( it == samp + 5 );
std::sort(samp, it);
auto it2 = std::unique(samp, it);
VERIFY( it2 == it );
}
void
test04()
{
std::forward_list<int> pop{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
std::stringstream samp;
// forward iterator for population and output iterator for result
sample(pop.begin(), pop.end(), ostream_iterator<int>{samp, " "}, 5, rng);
// samp.rdbuf()->pubseekoff(0, std::ios::beg);
std::vector<int> v(istream_iterator<int>{samp}, {});
VERIFY( v.size() == 5 );
std::sort(v.begin(), v.end());
auto it = std::unique(v.begin(), v.end());
VERIFY( it == v.end() );
}
int
main()
{
test01();
test02();
test03();
test04();
}
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