5e97d37b96
The renames the output_iterator to cpp17_output_iterator. These iterators are still used in C++20 so it's not possible to change the current type to the new C++20 requirements. This is done in a similar fashion as the cpp17_input_iterator. Reviewed By: #libc, Quuxplusone, ldionne Differential Revision: https://reviews.llvm.org/D117950
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14
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// <algorithm>
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// template <class PopulationIterator, class SampleIterator, class Distance,
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// class UniformRandomNumberGenerator>
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// SampleIterator sample(PopulationIterator first, PopulationIterator last,
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// SampleIterator out, Distance n,
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// UniformRandomNumberGenerator &&g);
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#include <algorithm>
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#include <random>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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// Stable if and only if PopulationIterator meets the requirements of a
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// ForwardIterator type.
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template <class PopulationIterator, class SampleIterator>
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void test_stability(bool expect_stable) {
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const unsigned kPopulationSize = 100;
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int ia[kPopulationSize];
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for (unsigned i = 0; i < kPopulationSize; ++i)
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ia[i] = i;
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PopulationIterator first(ia);
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PopulationIterator last(ia + kPopulationSize);
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const unsigned kSampleSize = 20;
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int oa[kPopulationSize];
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SampleIterator out(oa);
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std::minstd_rand g;
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const int kIterations = 1000;
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bool unstable = false;
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for (int i = 0; i < kIterations; ++i) {
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std::sample(first, last, out, kSampleSize, g);
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unstable |= !std::is_sorted(oa, oa + kSampleSize);
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}
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assert(expect_stable == !unstable);
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}
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int main(int, char**) {
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test_stability<forward_iterator<int *>, cpp17_output_iterator<int *> >(true);
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test_stability<cpp17_input_iterator<int *>, random_access_iterator<int *> >(false);
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return 0;
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}
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