mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
add C++14 constexpr stable_partition, stable_sort, inplace_merge
This commit is contained in:
bolero-MURAKAMI
parent
262a5aa48b
commit
856fb90150
4 changed files with 178 additions and 14 deletions
53
sprout/algorithm/cxx14/detail/insertion_sort.hpp
Normal file
53
sprout/algorithm/cxx14/detail/insertion_sort.hpp
Normal file
|
|
@ -0,0 +1,53 @@
|
|||
/*=============================================================================
|
||||
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_DETAIL_INSERTION_SORT_HPP
|
||||
#define SPROUT_ALGORITHM_CXX14_DETAIL_INSERTION_SORT_HPP
|
||||
|
||||
#include <iterator>
|
||||
#include <sprout/config.hpp>
|
||||
#include <sprout/algorithm/cxx14/move_backward.hpp>
|
||||
#include <sprout/utility/move.hpp>
|
||||
|
||||
namespace sprout {
|
||||
namespace detail {
|
||||
template<typename RandomAccessIterator, typename Compare>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
unguarded_linear_insert(RandomAccessIterator last, Compare comp) {
|
||||
typedef typename std::iterator_traits<RandomAccessIterator>::value_type value_type;
|
||||
value_type val = sprout::move(*last);
|
||||
RandomAccessIterator next = last;
|
||||
--next;
|
||||
while (comp(val, *next)) {
|
||||
*last = sprout::move(*next);
|
||||
last = next;
|
||||
--next;
|
||||
}
|
||||
*last = sprout::move(val);
|
||||
}
|
||||
|
||||
template<typename RandomAccessIterator, typename Compare>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
insertion_sort(RandomAccessIterator first, RandomAccessIterator last, Compare comp) {
|
||||
typedef typename std::iterator_traits<RandomAccessIterator>::value_type value_type;
|
||||
if (first == last) {
|
||||
return;
|
||||
}
|
||||
for (RandomAccessIterator i = first + 1; i != last; ++i) {
|
||||
if (comp(*i, *first)) {
|
||||
value_type val = sprout::move(*i);
|
||||
sprout::move_backward(first, i, i + 1);
|
||||
*first = sprout::move(val);
|
||||
} else {
|
||||
sprout::detail::unguarded_linear_insert(i, comp);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
} // namespace sprout
|
||||
|
||||
#endif // #ifndef SPROUT_ALGORITHM_CXX14_DETAIL_INSERTION_SORT_HPP
|
||||
|
|
@ -8,20 +8,79 @@
|
|||
#ifndef SPROUT_ALGORITHM_CXX14_INPLACE_MERGE_HPP
|
||||
#define SPROUT_ALGORITHM_CXX14_INPLACE_MERGE_HPP
|
||||
|
||||
#include <iterator>
|
||||
#include <sprout/config.hpp>
|
||||
#include <sprout/iterator/distance.hpp>
|
||||
#include <sprout/iterator/advance.hpp>
|
||||
#include <sprout/algorithm/lower_bound.hpp>
|
||||
#include <sprout/algorithm/upper_bound.hpp>
|
||||
#include <sprout/algorithm/cxx14/iter_swap.hpp>
|
||||
#include <sprout/algorithm/cxx14/rotate.hpp>
|
||||
#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
|
||||
|
||||
namespace sprout {
|
||||
namespace detail {
|
||||
template<typename BidirectionalIterator, typename Distance, typename Compare>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
inplace_merge(
|
||||
BidirectionalIterator first, BidirectionalIterator middle, BidirectionalIterator last,
|
||||
Distance len1, Distance len2, Compare comp
|
||||
)
|
||||
{
|
||||
if (len1 == 0 || len2 == 0) {
|
||||
return;
|
||||
}
|
||||
if (len1 + len2 == 2) {
|
||||
if (comp(*middle, *first)) {
|
||||
sprout::iter_swap(first, middle);
|
||||
}
|
||||
return;
|
||||
}
|
||||
BidirectionalIterator first_cut = first;
|
||||
BidirectionalIterator second_cut = middle;
|
||||
Distance len11 = 0;
|
||||
Distance len22 = 0;
|
||||
if (len1 > len2) {
|
||||
len11 = len1 / 2;
|
||||
sprout::advance(first_cut, len11);
|
||||
second_cut = sprout::lower_bound(middle, last, *first_cut, comp);
|
||||
len22 = sprout::distance(middle, second_cut);
|
||||
} else {
|
||||
len22 = len2 / 2;
|
||||
sprout::advance(second_cut, len22);
|
||||
first_cut = sprout::upper_bound(first, middle, *second_cut, comp);
|
||||
len11 = sprout::distance(first, first_cut);
|
||||
}
|
||||
sprout::rotate(first_cut, middle, second_cut);
|
||||
BidirectionalIterator new_middle = first_cut;
|
||||
sprout::advance(new_middle, sprout::distance(middle, second_cut));
|
||||
sprout::detail::inplace_merge(first, first_cut, new_middle, len11, len22, comp);
|
||||
sprout::detail::inplace_merge(new_middle, second_cut, last, len1 - len11, len2 - len22, comp);
|
||||
}
|
||||
} // namespace detail
|
||||
//
|
||||
// 25.4.4 Merge
|
||||
//
|
||||
// !!! TODO: implementation
|
||||
template<typename BidirectionalIterator>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
inplace_merge(BidirectionalIterator first, BidirectionalIterator middle, BidirectionalIterator last);
|
||||
|
||||
template<typename BidirectionalIterator, typename Compare>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
inplace_merge(BidirectionalIterator first, BidirectionalIterator middle, BidirectionalIterator last, Compare comp);
|
||||
inplace_merge(BidirectionalIterator first, BidirectionalIterator middle, BidirectionalIterator last, Compare comp) {
|
||||
typedef typename std::iterator_traits<BidirectionalIterator>::difference_type difference_type;
|
||||
if (first == middle || middle == last) {
|
||||
return;
|
||||
}
|
||||
difference_type const len1 = sprout::distance(first, middle);
|
||||
difference_type const len2 = sprout::distance(middle, last);
|
||||
sprout::detail::inplace_merge(first, middle, last, len1, len2, comp);
|
||||
}
|
||||
|
||||
template<typename BidirectionalIterator>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
inplace_merge(BidirectionalIterator first, BidirectionalIterator middle, BidirectionalIterator last) {
|
||||
sprout::inplace_merge(
|
||||
first, middle, last,
|
||||
NS_SSCRISK_CEL_OR_SPROUT::less<typename std::iterator_traits<BidirectionalIterator>::value_type>()
|
||||
);
|
||||
}
|
||||
} // namespace sprout
|
||||
|
||||
#endif // #ifndef SPROUT_ALGORITHM_CXX14_INPLACE_MERGE_HPP
|
||||
|
|
|
|||
|
|
@ -9,15 +9,44 @@
|
|||
#define SPROUT_ALGORITHM_CXX14_STABLE_PARTITION_HPP
|
||||
|
||||
#include <sprout/config.hpp>
|
||||
#include <sprout/iterator/distance.hpp>
|
||||
#include <sprout/iterator/next.hpp>
|
||||
#include <sprout/iterator/advance.hpp>
|
||||
#include <sprout/algorithm/find_if_not.hpp>
|
||||
#include <sprout/algorithm/cxx14/rotate.hpp>
|
||||
|
||||
namespace sprout {
|
||||
namespace detail {
|
||||
template<typename BidirectionalIterator, typename Predicate, typename Distance>
|
||||
inline SPROUT_CXX14_CONSTEXPR BidirectionalIterator
|
||||
inplace_stable_partition(BidirectionalIterator first, Predicate pred, Distance len) {
|
||||
if (len == 1) {
|
||||
return first;
|
||||
}
|
||||
BidirectionalIterator middle = first;
|
||||
sprout::advance(middle, len / 2);
|
||||
BidirectionalIterator left_split = sprout::detail::inplace_stable_partition(first, pred, len / 2);
|
||||
Distance right_len = len - len / 2;
|
||||
BidirectionalIterator right_split = sprout::find_if_not(middle, sprout::next(middle, right_len), pred);
|
||||
if (right_len) {
|
||||
right_split = sprout::detail::inplace_stable_partition(middle, pred, right_len);
|
||||
}
|
||||
sprout::rotate(left_split, middle, right_split);
|
||||
sprout::advance(left_split, sprout::distance(middle, right_split));
|
||||
return left_split;
|
||||
}
|
||||
} // namespace sprout
|
||||
//
|
||||
// 25.3.13 Partitions
|
||||
//
|
||||
// !!! TODO: implementation
|
||||
template<typename BidirectionalIterator, typename Predicate>
|
||||
inline SPROUT_CXX14_CONSTEXPR BidirectionalIterator
|
||||
stable_partition(BidirectionalIterator first, BidirectionalIterator last, Predicate pred);
|
||||
stable_partition(BidirectionalIterator first, BidirectionalIterator last, Predicate pred) {
|
||||
first = sprout::find_if_not(first, last, pred);
|
||||
return first == last ? first
|
||||
: sprout::detail::inplace_stable_partition(first, pred, sprout::distance(first, last))
|
||||
;
|
||||
}
|
||||
} // namespace sprout
|
||||
|
||||
#endif // #ifndef SPROUT_ALGORITHM_CXX14_STABLE_PARTITION_HPP
|
||||
|
|
|
|||
|
|
@ -9,19 +9,42 @@
|
|||
#define SPROUT_ALGORITHM_CXX14_STABLE_SORT_HPP
|
||||
|
||||
#include <sprout/config.hpp>
|
||||
#include <sprout/algorithm/cxx14/detail/insertion_sort.hpp>
|
||||
#include <sprout/algorithm/cxx14/inplace_merge.hpp>
|
||||
#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
|
||||
|
||||
namespace sprout {
|
||||
namespace detail {
|
||||
template<typename RandomAccessIterator, typename Compare>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
inplace_stable_sort(RandomAccessIterator first, RandomAccessIterator last, Compare comp) {
|
||||
if (last - first < 15) {
|
||||
sprout::detail::insertion_sort(first, last, comp);
|
||||
return;
|
||||
}
|
||||
RandomAccessIterator middle = first + (last - first) / 2;
|
||||
sprout::detail::inplace_stable_sort(first, middle, comp);
|
||||
sprout::detail::inplace_stable_sort(middle, last, comp);
|
||||
sprout::detail::inplace_merge(first, middle, last, middle - first, last - middle, comp);
|
||||
}
|
||||
} // namespace detail
|
||||
//
|
||||
// 25.4.1.2 stable_sort
|
||||
//
|
||||
// !!! TODO: implementation
|
||||
template<typename RandomAccessIterator>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
stable_sort(RandomAccessIterator first, RandomAccessIterator last);
|
||||
|
||||
template<typename RandomAccessIterator, typename Compare>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
stable_sort(RandomAccessIterator first, RandomAccessIterator last, Compare comp);
|
||||
stable_sort(RandomAccessIterator first, RandomAccessIterator last, Compare comp) {
|
||||
sprout::detail::inplace_stable_sort(first, last, comp);
|
||||
}
|
||||
|
||||
template<typename RandomAccessIterator>
|
||||
inline SPROUT_CXX14_CONSTEXPR void
|
||||
stable_sort(RandomAccessIterator first, RandomAccessIterator last) {
|
||||
sprout::stable_sort(
|
||||
first, last,
|
||||
NS_SSCRISK_CEL_OR_SPROUT::less<typename std::iterator_traits<RandomAccessIterator>::value_type>()
|
||||
);
|
||||
}
|
||||
} // namespace sprout
|
||||
|
||||
#endif // #ifndef SPROUT_ALGORITHM_CXX14_STABLE_SORT_HPP
|
||||
|
|
|
|||
Loading…
Reference in a new issue