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31cbe0f240
C++98 and C++03 are effectively aliases as far as Clang is concerned. As such, allowing both std=c++98 and std=c++03 as Lit parameters is just slightly confusing, but provides no value. It's similar to allowing both std=c++17 and std=c++1z, which we don't do. This was discovered because we had an internal bot that ran the test suite under both c++98 AND c++03 -- one of which is redundant. Differential Revision: https://reviews.llvm.org/D80926
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 *>, output_iterator<int *> >(true);
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test_stability<input_iterator<int *>, random_access_iterator<int *> >(false);
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return 0;
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}
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