mirror of git://gcc.gnu.org/git/gcc.git
67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
// Copyright (C) 2016-2019 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++17" }
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// { dg-do run { target c++17 } }
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// { dg-require-cstdint "" }
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#ifndef _GLIBCXX_ASSERTIONS
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// Make std::uniform_int_distribution check its parameters
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# define _GLIBCXX_ASSERTIONS
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#endif
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#include <algorithm>
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#include <random>
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#include <climits>
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#include <testsuite_hooks.h>
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#include <testsuite_iterators.h>
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std::mt19937 rng;
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using std::sample;
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using __gnu_test::test_container;
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using __gnu_test::output_iterator_wrapper;
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void
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test01()
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{
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int pop[UCHAR_MAX] = { };
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for (int i = SCHAR_MAX; i < UCHAR_MAX; ++i)
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pop[i] = 1;
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const signed char sample_size = SCHAR_MAX; // PR libstdc++/77994
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int out[sample_size] = { };
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// random access iterators for both population and result
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// (uses reservoir sampling)
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auto it = sample(std::begin(pop), std::end(pop), out, sample_size, rng);
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auto sum = std::accumulate(out, it, 0);
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VERIFY( sum != 0 ); // exceedingly unlikely!
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// random access iterator for population and output iterator for result
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// (uses selection sampling)
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test_container<int, output_iterator_wrapper> samp2(out);
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sample(std::begin(pop), std::end(pop), samp2.begin(), sample_size, rng);
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sum = std::accumulate(std::begin(out), std::end(out), 0);
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VERIFY( sum != 0 );
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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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}
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