2013-08-08 09:54:33 +00:00
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/*=============================================================================
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Copyright (c) 2011-2013 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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2013-02-26 01:43:27 +00:00
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#ifndef SPROUT_ITERATOR_INSERT_RANGE_ITERATOR_HPP
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#define SPROUT_ITERATOR_INSERT_RANGE_ITERATOR_HPP
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#include <iterator>
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#include <utility>
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#include <type_traits>
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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 <sprout/utility/limited.hpp>
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#include <sprout/type_traits/arithmetic_promote.hpp>
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namespace sprout {
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//
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// insert_range_iterator
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//
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template<typename DstIterator, typename SrcIterator>
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class insert_range_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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protected:
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iterator_type current1;
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iterator_type pos1;
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iterator2_type current2;
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iterator2_type first2;
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iterator2_type last2;
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private:
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SPROUT_CONSTEXPR insert_range_iterator advance_impl(difference_type n) const {
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return n >= 0
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? current1 > pos1 ? insert_range_iterator(sprout::next(current1, n), pos1, current2, first2, last2)
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: current1 == pos1 ? current2 == last2 ? insert_range_iterator(sprout::next(current1, n), pos1, current2, first2, last2)
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: n <= sprout::distance(current2, last2) ? insert_range_iterator(current1, pos1, last2, sprout::next(current2, n), first2, last2)
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: insert_range_iterator(sprout::next(current1, n - sprout::distance(current2, last2)), pos1, last2, first2, last2)
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: n <= sprout::distance(current1, pos1) ? insert_range_iterator(sprout::next(current1, n), pos1, current2, first2, last2)
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: n <= sprout::distance(current1, pos1) + sprout::distance(current2, last2)
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? insert_range_iterator(pos1, pos1, last2, sprout::next(current2, n - sprout::distance(current1, pos1)), first2, last2)
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: insert_range_iterator(sprout::next(current1, n - sprout::distance(current1, pos1) - sprout::distance(current2, last2)), pos1, last2, first2, last2)
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: current1 < pos1 ? insert_range_iterator(sprout::next(current1, n), pos1, current2, first2, last2)
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: current1 == pos1 ? current2 == first2 ? insert_range_iterator(sprout::next(current1, n), pos1, current2, first2, last2)
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: -n <= sprout::distance(first2, current2) ? insert_range_iterator(current1, pos1, last2, sprout::next(current2, n), first2, last2)
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: insert_range_iterator(sprout::next(current1, n - sprout::distance(first2, current2)), pos1, first2, first2, last2)
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: -n <= sprout::distance(pos1, current1) ? insert_range_iterator(sprout::next(current1, n), pos1, current2, first2, last2)
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: -n <= sprout::distance(pos1, current1) + sprout::distance(first2, current2)
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? insert_range_iterator(pos1, pos1, last2, sprout::next(current2, n - sprout::distance(pos1, current1)), first2, last2)
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: insert_range_iterator(sprout::next(current1, n - sprout::distance(pos1, current1) - sprout::distance(first2, current2)), pos1, first2, first2, last2)
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;
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}
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public:
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insert_range_iterator() = default;
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insert_range_iterator(insert_range_iterator const&) = default;
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SPROUT_CONSTEXPR insert_range_iterator(iterator_type it1, iterator_type pos1, iterator2_type it2, iterator2_type first2, iterator2_type last2)
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: current1(it1), pos1(pos1)
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, current2(it2), first2(first2), last2(last2)
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{}
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template<typename U, typename V>
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SPROUT_CONSTEXPR insert_range_iterator(insert_range_iterator<U, V> const& it)
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: current1(it.base()), pos1(it.position())
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, current2(it.base2()), first2(it.first()), last2(it.last())
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{}
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template<typename U, typename V>
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insert_range_iterator& operator=(insert_range_iterator<U, V> const& it) {
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insert_range_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 current1;
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}
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SPROUT_CONSTEXPR iterator_type position() const {
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return pos1;
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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 first2;
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}
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SPROUT_CONSTEXPR iterator2_type last() const {
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return last2;
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}
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SPROUT_CONSTEXPR bool is_in_base() const {
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return current1 != pos1 || current2 == last2;
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}
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SPROUT_CONSTEXPR reference operator*() const {
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return is_in_base() ? *current1 : *current2;
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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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insert_range_iterator& operator++() {
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if (is_in_base()) {
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++current1;
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} else {
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++current2;
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}
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return *this;
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}
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insert_range_iterator operator++(int) {
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insert_range_iterator result(*this);
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if (is_in_base()) {
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++current1;
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} else {
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++current2;
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}
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return result;
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}
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insert_range_iterator& operator--() {
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if (current1 != pos1 || current2 == first2) {
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--current1;
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} else {
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--current2;
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}
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return *this;
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}
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insert_range_iterator operator--(int) {
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insert_range_iterator temp(*this);
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if (current1 != pos1 || current2 == first2) {
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--current1;
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} else {
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--current2;
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}
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return temp;
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}
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SPROUT_CONSTEXPR insert_range_iterator operator+(difference_type n) const {
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return advance_impl(n);
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}
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SPROUT_CONSTEXPR insert_range_iterator operator-(difference_type n) const {
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return advance_impl(-n);
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}
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insert_range_iterator& operator+=(difference_type n) {
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insert_range_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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insert_range_iterator& operator-=(difference_type n) {
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insert_range_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 insert_range_iterator next() const {
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return is_in_base() ? insert_range_iterator(sprout::next(current1), pos1, current2, first2, last2)
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: insert_range_iterator(current1, pos1, sprout::next(current2), first2, last2)
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;
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}
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SPROUT_CONSTEXPR insert_range_iterator prev() const {
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return current1 != pos1 || current2 == first2 ? insert_range_iterator(sprout::prev(current1), pos1, current2, first2, last2)
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: insert_range_iterator(current1, pos1, sprout::prev(current2), first2, last2)
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;
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}
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void swap(insert_range_iterator& other)
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SPROUT_NOEXCEPT_EXPR(
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SPROUT_NOEXCEPT_EXPR(sprout::swap(current1, other.current1))
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&& SPROUT_NOEXCEPT_EXPR(sprout::swap(pos1, other.pos1))
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&& SPROUT_NOEXCEPT_EXPR(sprout::swap(current2, other.current2))
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&& SPROUT_NOEXCEPT_EXPR(sprout::swap(first2, other.first2))
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&& SPROUT_NOEXCEPT_EXPR(sprout::swap(last2, other.last2))
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)
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{
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sprout::swap(current1, other.current1);
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sprout::swap(pos1, other.pos1);
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sprout::swap(current2, other.current2);
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sprout::swap(first2, other.first2);
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sprout::swap(last2, other.last2);
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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::insert_range_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::insert_range_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return lhs.base() == rhs.base() && lhs.base2() == rhs.base2();
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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::insert_range_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::insert_range_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::insert_range_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::insert_range_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return lhs.is_in_base() && rhs.is_in_base() ? lhs.base() < rhs.base()
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: !lhs.is_in_base() && !rhs.is_in_base() ? lhs.base2() < rhs.base2()
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: lhs.is_in_base()
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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::insert_range_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::insert_range_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::insert_range_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::insert_range_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::insert_range_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::insert_range_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 typename sprout::arithmetic_promote<
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typename sprout::insert_range_iterator<DstIterator1, SrcIterator1>::difference_type,
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typename sprout::insert_range_iterator<DstIterator2, SrcIterator2>::difference_type
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>::type
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operator-(
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sprout::insert_range_iterator<DstIterator1, SrcIterator1> const& lhs,
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sprout::insert_range_iterator<DstIterator2, SrcIterator2> const& rhs
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)
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{
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return sprout::limited::plus(lhs.base() - rhs.base(), lhs.base2() - rhs.base2());
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}
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template<typename DstIterator, typename SrcIterator>
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inline SPROUT_CONSTEXPR sprout::insert_range_iterator<DstIterator, SrcIterator> operator+(
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typename sprout::insert_range_iterator<DstIterator, SrcIterator>::difference_type n,
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sprout::insert_range_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_insert_range_iterator
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//
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template<typename DstIterator, typename SrcIterator>
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inline SPROUT_CONSTEXPR sprout::insert_range_iterator<DstIterator, SrcIterator>
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make_insert_range_iterator(DstIterator it1, DstIterator pos1, SrcIterator it2, SrcIterator first2, SrcIterator last2) {
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return sprout::insert_range_iterator<DstIterator, SrcIterator>(it1, pos1, it2, first2, last2);
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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 void
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swap(
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sprout::insert_range_iterator<DstIterator, SrcIterator>& lhs,
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sprout::insert_range_iterator<DstIterator, SrcIterator>& rhs
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)
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SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_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::insert_range_iterator<DstIterator, SrcIterator>
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iterator_next(sprout::insert_range_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::insert_range_iterator<DstIterator, SrcIterator>
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iterator_prev(sprout::insert_range_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_INSERT_RANGE_ITERATOR_HPP
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