mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
110 lines
4.7 KiB
C++
110 lines
4.7 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2016 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_FIND_SYMMETRIC_DIFFERENCE_HPP
|
|
#define SPROUT_ALGORITHM_FIND_SYMMETRIC_DIFFERENCE_HPP
|
|
|
|
#include <iterator>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include <sprout/tuple/tuple/tuple.hpp>
|
|
#include <sprout/tuple/tuple/get.hpp>
|
|
#include <sprout/functional/less.hpp>
|
|
#include <sprout/utility/pair/pair.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
template<typename InputIterator1, typename InputIterator2>
|
|
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2>
|
|
find_symmetric_difference_impl_check(sprout::tuples::tuple<InputIterator1, InputIterator2, bool> const& current) {
|
|
return sprout::pair<InputIterator1, InputIterator2>(
|
|
sprout::tuples::get<0>(current),
|
|
sprout::tuples::get<1>(current)
|
|
);
|
|
}
|
|
template<typename InputIterator1, typename InputIterator2, typename Compare>
|
|
inline SPROUT_CONSTEXPR sprout::tuples::tuple<InputIterator1, InputIterator2, bool>
|
|
find_symmetric_difference_impl_1(
|
|
sprout::tuples::tuple<InputIterator1, InputIterator2, bool> const& current,
|
|
InputIterator1 last1, InputIterator2 last2, Compare comp, typename std::iterator_traits<InputIterator1>::difference_type n
|
|
)
|
|
{
|
|
typedef sprout::tuples::tuple<InputIterator1, InputIterator2, bool> type;
|
|
return sprout::tuples::get<2>(current) || sprout::tuples::get<0>(current) == last1 || sprout::tuples::get<1>(current) == last2 ? current
|
|
: n == 1 ? comp(*sprout::tuples::get<0>(current), *sprout::tuples::get<1>(current)) || comp(*sprout::tuples::get<1>(current), *sprout::tuples::get<0>(current))
|
|
? type(sprout::tuples::get<0>(current), sprout::tuples::get<1>(current), true)
|
|
: type(sprout::next(sprout::tuples::get<0>(current)), sprout::next(sprout::tuples::get<1>(current)), false)
|
|
: sprout::detail::find_symmetric_difference_impl_1(
|
|
sprout::detail::find_symmetric_difference_impl_1(
|
|
current,
|
|
last1, last2, comp, n / 2
|
|
),
|
|
last1, last2, comp, n - n / 2
|
|
)
|
|
;
|
|
}
|
|
template<typename InputIterator1, typename InputIterator2, typename Compare>
|
|
inline SPROUT_CONSTEXPR sprout::tuples::tuple<InputIterator1, InputIterator2, bool>
|
|
find_symmetric_difference_impl(
|
|
sprout::tuples::tuple<InputIterator1, InputIterator2, bool> const& current,
|
|
InputIterator1 last1, InputIterator2 last2, Compare comp, typename std::iterator_traits<InputIterator1>::difference_type n
|
|
)
|
|
{
|
|
return sprout::tuples::get<2>(current) || sprout::tuples::get<0>(current) == last1 || sprout::tuples::get<1>(current) == last2 ? current
|
|
: sprout::detail::find_symmetric_difference_impl(
|
|
sprout::detail::find_symmetric_difference_impl_1(
|
|
current,
|
|
last1, last2, comp, n
|
|
),
|
|
last1, last2, comp, n * 2
|
|
)
|
|
;
|
|
}
|
|
template<typename InputIterator1, typename InputIterator2, typename Compare>
|
|
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2>
|
|
find_symmetric_difference(
|
|
InputIterator1 first1, InputIterator1 last1,
|
|
InputIterator2 first2, InputIterator2 last2,
|
|
Compare comp
|
|
)
|
|
{
|
|
typedef sprout::tuples::tuple<InputIterator1, InputIterator2, bool> type;
|
|
return sprout::detail::find_symmetric_difference_impl_check(
|
|
sprout::detail::find_symmetric_difference_impl(type(first1, first2, false), last1, last2, comp, 1)
|
|
);
|
|
}
|
|
} // namespace detail
|
|
|
|
//
|
|
// find_symmetric_difference
|
|
//
|
|
// recursion depth:
|
|
// O(log N)
|
|
//
|
|
template<typename InputIterator1, typename InputIterator2, typename Compare>
|
|
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2>
|
|
find_symmetric_difference(
|
|
InputIterator1 first1, InputIterator1 last1,
|
|
InputIterator2 first2, InputIterator2 last2,
|
|
Compare comp
|
|
)
|
|
{
|
|
return sprout::detail::find_symmetric_difference(first1, last1, first2, last2, comp);
|
|
}
|
|
template<typename InputIterator1, typename InputIterator2>
|
|
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, InputIterator2>
|
|
find_symmetric_difference(
|
|
InputIterator1 first1, InputIterator1 last1,
|
|
InputIterator2 first2, InputIterator2 last2
|
|
)
|
|
{
|
|
return sprout::find_symmetric_difference(first1, last1, first2, last2, sprout::less<>());
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_ALGORITHM_FIND_SYMMETRIC_DIFFERENCE_HPP
|