mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2013 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_ROTATE_HPP
|
|
#define SPROUT_ALGORITHM_ROTATE_HPP
|
|
|
|
#include <iterator>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/algorithm/iter_swap.hpp>
|
|
|
|
namespace sprout {
|
|
//
|
|
// 25.3.11 Rotate
|
|
//
|
|
template<typename ForwardIterator>
|
|
inline SPROUT_CXX14_CONSTEXPR ForwardIterator
|
|
rotate(ForwardIterator first, ForwardIterator middle, ForwardIterator last) {
|
|
if (first == middle) {
|
|
return last;
|
|
} else if (middle == last) {
|
|
return first;
|
|
}
|
|
ForwardIterator first2 = middle;
|
|
while (true) {
|
|
sprout::iter_swap(first, first2);
|
|
++first;
|
|
if (++first2 == last) {
|
|
break;
|
|
}
|
|
if (first == middle) {
|
|
middle = first2;
|
|
}
|
|
}
|
|
ForwardIterator result = first;
|
|
if (first != middle) {
|
|
first2 = middle;
|
|
while (true) {
|
|
sprout::iter_swap(first, first2);
|
|
++first;
|
|
if (++first2 == last) {
|
|
if (first == middle) {
|
|
break;
|
|
}
|
|
first2 = middle;
|
|
} else if (first == middle) {
|
|
middle = first2;
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
} // namespace sprout
|
|
|
|
#include <sprout/algorithm/fixed/rotate.hpp>
|
|
#include <sprout/algorithm/fit/rotate.hpp>
|
|
|
|
#endif // #ifndef SPROUT_ALGORITHM_ROTATE_HPP
|