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38 lines
1.5 KiB
C++
38 lines
1.5 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2018 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_ALGORITHM_CXX14_RANDOM_SWAP_HPP
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#define SPROUT_ALGORITHM_CXX14_RANDOM_SWAP_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/algorithm/cxx14/iter_swap.hpp>
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#include <sprout/workaround/detail/uniform_int_distribution.hpp>
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namespace sprout {
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//
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// random_swap
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//
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template<typename RandomAccessIterator, typename UniformRandomNumberGenerator>
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inline SPROUT_CXX14_CONSTEXPR void
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random_swap(RandomAccessIterator first, RandomAccessIterator last, UniformRandomNumberGenerator&& g) {
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typedef typename std::iterator_traits<RandomAccessIterator>::difference_type difference_type;
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typedef SPROUT_WORKAROUND_DETAIL_UNIFORM_INT_DISTRIBUTION<std::ptrdiff_t> distribution_type;
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difference_type d = last - first;
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if (d > 1) {
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distribution_type dist(0, d);
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difference_type i = dist(g);
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difference_type j = dist(g);
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if (i != j) {
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sprout::iter_swap(first + i, first + j);
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}
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}
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_CXX14_RANDOM_SWAP_HPP
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