mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
354 lines
12 KiB
C++
354 lines
12 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_ITERATOR_REMAKE_ITERATOR_HPP
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#define SPROUT_ITERATOR_REMAKE_ITERATOR_HPP
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#include <iterator>
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#include <utility>
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#include <sprout/config.hpp>
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#include <sprout/iterator/next.hpp>
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#include <sprout/iterator/prev.hpp>
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#include <sprout/iterator/distance.hpp>
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#include <sprout/iterator/type_traits/common.hpp>
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#include <sprout/utility/swap.hpp>
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#include HDR_ALGORITHM_MIN_MAX_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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//
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// remake_iterator
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//
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template<typename DstIterator, typename SrcIterator>
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class remake_iterator
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: public std::iterator<
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typename sprout::common_iterator_category<DstIterator, SrcIterator>::type,
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typename sprout::common_iterator_value_type<DstIterator, SrcIterator>::type,
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typename sprout::common_iterator_difference_type<DstIterator, SrcIterator>::type,
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typename sprout::common_iterator_pointer<DstIterator, SrcIterator>::type,
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typename sprout::common_iterator_reference<DstIterator, SrcIterator>::type
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>
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{
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public:
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typedef DstIterator iterator_type;
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typedef SrcIterator iterator2_type;
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typedef typename sprout::common_iterator_category<DstIterator, SrcIterator>::type iterator_category;
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typedef typename sprout::common_iterator_value_type<DstIterator, SrcIterator>::type value_type;
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typedef typename sprout::common_iterator_difference_type<DstIterator, SrcIterator>::type difference_type;
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typedef typename sprout::common_iterator_pointer<DstIterator, SrcIterator>::type pointer;
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typedef typename sprout::common_iterator_reference<DstIterator, SrcIterator>::type reference;
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private:
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SPROUT_CONSTEXPR remake_iterator advance_impl(difference_type n) const {
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return n >= 0
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? remake_iterator(
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sprout::next(current, n),
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begin_off - n >= 0 ? fst
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: (end_off - begin_off >= sprout::distance(fst, lst) && begin_off - n <= -sprout::distance(fst, lst)) ? lst
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: begin_off <= 0
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? sprout::next(current2, NS_SSCRISK_CEL_OR_SPROUT::min(NS_SSCRISK_CEL_OR_SPROUT::min(n, end_off), sprout::distance(current2, lst)))
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: sprout::next(current2, NS_SSCRISK_CEL_OR_SPROUT::min(NS_SSCRISK_CEL_OR_SPROUT::min(n - begin_off, end_off), sprout::distance(current2, lst)))
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,
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fst, lst,
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begin_off - n, end_off - n
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)
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: remake_iterator(
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sprout::next(current, n),
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begin_off - n >= 0 ? fst
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: (end_off - begin_off >= sprout::distance(fst, lst) && begin_off - n <= -sprout::distance(fst, lst)) ? lst
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: begin_off >= -sprout::distance(fst, lst)
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? sprout::next(current2, n)
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: sprout::next(current2, n - (begin_off + sprout::distance(fst, lst)))
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,
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fst, lst,
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begin_off - n, end_off - n
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)
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;
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}
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protected:
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iterator_type current;
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iterator2_type current2;
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iterator2_type fst;
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iterator2_type lst;
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difference_type begin_off;
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difference_type end_off;
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public:
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SPROUT_CONSTEXPR remake_iterator()
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: current(), current2()
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, fst(), lst()
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, begin_off(), end_off()
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{}
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SPROUT_CONSTEXPR remake_iterator(remake_iterator const& other)
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: current(other.current), current2(other.current2)
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, fst(other.fst), lst(other.lst)
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, begin_off(other.begin_off), end_off(other.end_off)
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{}
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SPROUT_CONSTEXPR remake_iterator(iterator_type it, iterator2_type it2, iterator2_type fst, iterator2_type lst, difference_type begin_off, difference_type end_off)
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: current(it), current2(it2)
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, fst(fst), lst(lst)
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, begin_off(begin_off), end_off(end_off)
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{}
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template<typename U, typename V>
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SPROUT_CONSTEXPR remake_iterator(remake_iterator<U, V> const& it)
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: current(it.base()), current2(it.base2())
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, fst(it.first()), lst(it.last())
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, begin_off(it.begin_offset()), end_off(it.end_offset())
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{}
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template<typename U, typename V>
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SPROUT_CXX14_CONSTEXPR remake_iterator& operator=(remake_iterator<U, V> const& it) {
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remake_iterator temp(it);
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temp.swap(*this);
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return *this;
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}
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SPROUT_CONSTEXPR iterator_type base() const {
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return current;
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}
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SPROUT_CONSTEXPR iterator2_type base2() const {
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return current2;
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}
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SPROUT_CONSTEXPR iterator2_type first() const {
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return fst;
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}
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SPROUT_CONSTEXPR iterator2_type last() const {
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return lst;
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}
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SPROUT_CONSTEXPR difference_type begin_offset() const {
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return begin_off;
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}
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SPROUT_CONSTEXPR difference_type end_offset() const {
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return end_off;
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}
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SPROUT_CONSTEXPR bool is_in_copying() const {
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return begin_off <= 0 && end_off > 0 && current2 != lst;
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}
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SPROUT_CONSTEXPR reference operator*() const {
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return is_in_copying() ? *current2 : *current;
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}
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SPROUT_CONSTEXPR pointer operator->() const {
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return &*(*this);
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}
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SPROUT_CXX14_CONSTEXPR remake_iterator& operator++() {
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++current;
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if (is_in_copying()) {
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++current2;
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}
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--begin_off;
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--end_off;
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return *this;
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}
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SPROUT_CXX14_CONSTEXPR remake_iterator operator++(int) {
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remake_iterator result(*this);
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++current;
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if (is_in_copying()) {
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++current2;
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}
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--begin_off;
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--end_off;
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return result;
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}
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SPROUT_CXX14_CONSTEXPR remake_iterator& operator--() {
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--current;
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if (begin_off < 0 && end_off >= 0) {
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--current2;
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}
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++begin_off;
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++end_off;
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return *this;
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}
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SPROUT_CXX14_CONSTEXPR remake_iterator operator--(int) {
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remake_iterator temp(*this);
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--current;
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if (begin_off < 0 && end_off >= 0) {
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--current2;
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}
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++begin_off;
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++end_off;
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return temp;
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}
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SPROUT_CONSTEXPR remake_iterator operator+(difference_type n) const {
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return advance_impl(n);
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}
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SPROUT_CONSTEXPR remake_iterator operator-(difference_type n) const {
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return advance_impl(-n);
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}
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SPROUT_CXX14_CONSTEXPR remake_iterator& operator+=(difference_type n) {
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remake_iterator temp(*this + n);
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temp.swap(*this);
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return *this;
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}
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SPROUT_CXX14_CONSTEXPR remake_iterator& operator-=(difference_type n) {
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remake_iterator temp(*this - n);
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temp.swap(*this);
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return *this;
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}
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SPROUT_CONSTEXPR reference operator[](difference_type n) const {
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return *(*this + n);
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}
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SPROUT_CONSTEXPR remake_iterator next() const {
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return remake_iterator(
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sprout::next(current), (is_in_copying() ? sprout::next(current2) : current2),
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fst, lst,
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begin_off - 1, end_off - 1
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);
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}
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SPROUT_CONSTEXPR remake_iterator prev() const {
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return remake_iterator(
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sprout::prev(current), (begin_off < 0 && end_off >= 0 ? sprout::prev(current2) : current2),
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fst, lst,
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begin_off + 1, end_off + 1
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);
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}
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SPROUT_CXX14_CONSTEXPR void swap(remake_iterator& other)
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SPROUT_NOEXCEPT_IF(
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SPROUT_NOEXCEPT_EXPR(swap(current, other.current))
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&& SPROUT_NOEXCEPT_EXPR(swap(current2, other.current2))
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&& SPROUT_NOEXCEPT_EXPR(swap(fst, other.fst))
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&& SPROUT_NOEXCEPT_EXPR(swap(lst, other.lst))
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&& SPROUT_NOEXCEPT_EXPR(swap(begin_off, other.begin_off))
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&& SPROUT_NOEXCEPT_EXPR(swap(end_off, other.end_off))
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)
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{
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swap(current, other.current);
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swap(current2, other.current2);
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swap(fst, other.fst);
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swap(lst, other.lst);
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swap(begin_off, other.begin_off);
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swap(end_off, other.end_off);
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}
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};
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template<
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typename DstIterator1, typename SrcIterator1,
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typename DstIterator2, typename SrcIterator2
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>
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inline SPROUT_CONSTEXPR bool operator==(
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sprout::remake_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::remake_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return lhs.base() == rhs.base();
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}
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template<
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typename DstIterator1, typename SrcIterator1,
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typename DstIterator2, typename SrcIterator2
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>
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inline SPROUT_CONSTEXPR bool operator!=(
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sprout::remake_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::remake_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return !(lhs == rhs);
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}
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template<
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typename DstIterator1, typename SrcIterator1,
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typename DstIterator2, typename SrcIterator2
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>
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inline SPROUT_CONSTEXPR bool operator<(
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sprout::remake_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::remake_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return lhs.base() < rhs.base();
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}
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template<
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typename DstIterator1, typename SrcIterator1,
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typename DstIterator2, typename SrcIterator2
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>
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inline SPROUT_CONSTEXPR bool operator>(
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sprout::remake_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::remake_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return rhs < lhs;
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}
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template<
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typename DstIterator1, typename SrcIterator1,
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typename DstIterator2, typename SrcIterator2
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>
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inline SPROUT_CONSTEXPR bool operator<=(
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sprout::remake_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::remake_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return !(rhs < lhs);
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}
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template<
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typename DstIterator1, typename SrcIterator1,
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typename DstIterator2, typename SrcIterator2
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>
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inline SPROUT_CONSTEXPR bool operator>=(
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sprout::remake_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::remake_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return !(lhs < rhs);
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}
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template<
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typename DstIterator1, typename SrcIterator1,
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typename DstIterator2, typename SrcIterator2
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>
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inline SPROUT_CONSTEXPR decltype(std::declval<DstIterator1>() - std::declval<DstIterator2>())
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operator-(
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sprout::remake_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::remake_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return lhs.base() - rhs.base();
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}
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template<typename DstIterator, typename SrcIterator>
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inline SPROUT_CONSTEXPR sprout::remake_iterator<DstIterator, SrcIterator> operator+(
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typename sprout::remake_iterator<DstIterator, SrcIterator>::difference_type n,
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sprout::remake_iterator<DstIterator, SrcIterator> const& it
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)
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{
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return it + n;
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}
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//
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// make_remake_iterator
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//
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template<typename DstIterator, typename SrcIterator>
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inline SPROUT_CONSTEXPR sprout::remake_iterator<DstIterator, SrcIterator>
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make_remake_iterator(
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DstIterator it, SrcIterator it2,
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SrcIterator fst, SrcIterator lst,
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typename sprout::remake_iterator<DstIterator, SrcIterator>::difference_type begin_off,
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typename sprout::remake_iterator<DstIterator, SrcIterator>::difference_type end_off
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)
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{
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return sprout::remake_iterator<DstIterator, SrcIterator>(it, it2, fst, lst, begin_off, end_off);
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}
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//
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// swap
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//
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template<typename DstIterator, typename SrcIterator>
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inline SPROUT_CXX14_CONSTEXPR void
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swap(sprout::remake_iterator<DstIterator, SrcIterator>& lhs, sprout::remake_iterator<DstIterator, SrcIterator>& rhs)
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SPROUT_NOEXCEPT_IF_EXPR(lhs.swap(rhs))
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{
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lhs.swap(rhs);
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}
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//
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// iterator_next
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//
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template<typename DstIterator, typename SrcIterator>
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inline SPROUT_CONSTEXPR sprout::remake_iterator<DstIterator, SrcIterator>
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iterator_next(sprout::remake_iterator<DstIterator, SrcIterator> const& it) {
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return it.next();
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}
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//
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// iterator_prev
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//
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template<typename DstIterator, typename SrcIterator>
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inline SPROUT_CONSTEXPR sprout::remake_iterator<DstIterator, SrcIterator>
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iterator_prev(sprout::remake_iterator<DstIterator, SrcIterator> const& it) {
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return it.prev();
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ITERATOR_REMAKE_ITERATOR_HPP
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