mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
39 lines
1.4 KiB
C++
39 lines
1.4 KiB
C++
|
/*=============================================================================
|
||
|
|
Copyright (c) 2011-2014 Bolero MURAKAMI
|
||
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
||
|
|
|
||
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||
|
|
=============================================================================*/
|
||
|
|
#ifndef SPROUT_ALGORITHM_CXX14_RANDOM_SWAP_HPP
|
||
|
|
#define SPROUT_ALGORITHM_CXX14_RANDOM_SWAP_HPP
|
||
|
|
|
||
|
|
#include <cstddef>
|
||
|
|
#include <iterator>
|
||
|
|
#include <sprout/config.hpp>
|
||
|
|
#include <sprout/algorithm/cxx14/iter_swap.hpp>
|
||
|
|
#include <sprout/workaround/detail/uniform_int_distribution.hpp>
|
||
|
|
|
||
|
|
namespace sprout {
|
||
|
|
//
|
||
|
|
// random_swap
|
||
|
|
//
|
||
|
|
template<typename RandomAccessIterator, typename UniformRandomNumberGenerator>
|
||
|
|
inline SPROUT_CXX14_CONSTEXPR void
|
||
|
|
random_swap(RandomAccessIterator first, RandomAccessIterator last, UniformRandomNumberGenerator&& g) {
|
||
|
|
typedef typename std::iterator_traits<RandomAccessIterator>::difference_type difference_type;
|
||
|
|
typedef SPROUT_WORKAROUND_DETAIL_UNIFORM_INT_DISTRIBUTION<std::ptrdiff_t> distribution_type;
|
||
|
|
difference_type d = last - first;
|
||
|
|
if (d > 1) {
|
||
|
|
distribution_type dist(0, d);
|
||
|
|
difference_type i = dist(g);
|
||
|
|
difference_type j = dist(g);
|
||
|
|
if (i != j) {
|
||
|
|
sprout::iter_swap(first + i, first + j);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} // namespace sprout
|
||
|
|
|
||
|
|
#endif // #ifndef SPROUT_ALGORITHM_CXX14_RANDOM_SWAP_HPP
|