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add C++14 constexpr bogo_sort, bozo_sort

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bolero-MURAKAMI 2014-04-05 21:56:06 +09:00
parent c54c980b79
commit 57d4e78d54
5 changed files with 114 additions and 6 deletions
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38
sprout/algorithm/cxx14/random_swap.hpp Normal file
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/*=============================================================================
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