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// Copyright (C) 2016 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++17" }
// { dg-do run { target c++1z } }
#ifndef _GLIBCXX_ASSERTIONS
// Make std::uniform_int_distribution check its parameters
# define _GLIBCXX_ASSERTIONS
#endif
#include <algorithm>
#include <random>
#include <climits>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
std::mt19937 rng;
using std::sample;
using __gnu_test::test_container;
using __gnu_test::output_iterator_wrapper;
void
test01()
{
int pop[UCHAR_MAX] = { };
for (int i = SCHAR_MAX; i < UCHAR_MAX; ++i)
pop[i] = 1;
const signed char sample_size = SCHAR_MAX; // PR libstdc++/77994
int out[sample_size] = { };
// random access iterators for both population and result
// (uses reservoir sampling)
auto it = sample(std::begin(pop), std::end(pop), out, sample_size, rng);
auto sum = std::accumulate(out, it, 0);
VERIFY( sum != 0 ); // exceedingly unlikely!
// random access iterator for population and output iterator for result
// (uses selection sampling)
test_container<int, output_iterator_wrapper> samp2(out);
sample(std::begin(pop), std::end(pop), samp2.begin(), sample_size, rng);
sum = std::accumulate(std::begin(out), std::end(out), 0);
VERIFY( sum != 0 );
}
int
main()
{
test01();
}
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