mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
299 lines
9.5 KiB
C++
299 lines
9.5 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 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_PTR_INDEX_ITERATOR_HPP
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#define SPROUT_ITERATOR_PTR_INDEX_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/detail/iterator_to_pointer.hpp>
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#include <sprout/iterator/detail/iterator_base.hpp>
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#include <sprout/utility/swap.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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namespace sprout {
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//
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// ptr_index_iterator
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//
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template<typename T, bool ConvertibleToPointer = false>
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class ptr_index_iterator
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: public sprout::detail::iterator_base<T*>::type
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, public sprout::detail::iterator_to_pointer_base<
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sprout::ptr_index_iterator<T, ConvertibleToPointer>,
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typename std::iterator_traits<T*>::pointer,
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ConvertibleToPointer
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>
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{
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private:
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typedef typename sprout::detail::iterator_base<T*>::type base_type;
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public:
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typedef T type;
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typedef typename base_type::iterator_category iterator_category;
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typedef typename base_type::value_type value_type;
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typedef typename base_type::difference_type difference_type;
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typedef typename base_type::pointer pointer;
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typedef typename base_type::reference reference;
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typedef typename std::remove_pointer<pointer>::type const* const_pointer;
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private:
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pointer p_;
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difference_type index_;
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public:
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SPROUT_CONSTEXPR ptr_index_iterator()
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: p_(), index_()
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{}
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ptr_index_iterator(ptr_index_iterator const&) = default;
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explicit SPROUT_CONSTEXPR ptr_index_iterator(pointer p)
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: p_(p), index_(0)
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{}
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SPROUT_CONSTEXPR ptr_index_iterator(pointer p, difference_type index)
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: p_(p), index_(index)
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{}
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SPROUT_CONSTEXPR operator ptr_index_iterator<const_pointer>() const {
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return ptr_index_iterator<const_pointer>(p_, index_);
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}
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SPROUT_CONSTEXPR pointer base() const {
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return p_;
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}
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SPROUT_CONSTEXPR difference_type index() const {
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return index_;
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}
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SPROUT_CONSTEXPR pointer ptr() const {
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return p_ + index_;
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}
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SPROUT_CONSTEXPR ptr_index_iterator next() const {
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return ptr_index_iterator(p_, index_ + 1);
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}
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SPROUT_CONSTEXPR ptr_index_iterator prev() const {
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return ptr_index_iterator(p_, index_ - 1);
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}
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SPROUT_CXX14_CONSTEXPR void swap(ptr_index_iterator& other)
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SPROUT_NOEXCEPT
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{
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sprout::swap(p_, other.p_);
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sprout::swap(index_, other.index_);
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}
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SPROUT_CONSTEXPR reference operator*() const {
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return p_[index_];
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}
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SPROUT_CONSTEXPR pointer operator->() const {
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return p_ + index_;
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}
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SPROUT_CXX14_CONSTEXPR ptr_index_iterator& operator++() {
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ptr_index_iterator temp(next());
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temp.swap(*this);
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return *this;
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}
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SPROUT_CXX14_CONSTEXPR ptr_index_iterator operator++(int) {
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ptr_index_iterator result(*this);
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++*this;
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return result;
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}
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SPROUT_CXX14_CONSTEXPR ptr_index_iterator& operator--() {
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ptr_index_iterator temp(prev());
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temp.swap(*this);
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return *this;
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}
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SPROUT_CXX14_CONSTEXPR ptr_index_iterator operator--(int) {
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ptr_index_iterator result(*this);
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--*this;
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return result;
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}
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SPROUT_CONSTEXPR ptr_index_iterator operator+(difference_type n) const {
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return ptr_index_iterator(p_, index_ + n);
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}
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SPROUT_CONSTEXPR ptr_index_iterator operator-(difference_type n) const {
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return ptr_index_iterator(p_, index_ - n);
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}
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SPROUT_CXX14_CONSTEXPR ptr_index_iterator& operator+=(difference_type n) {
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ptr_index_iterator temp(p_, index_ + 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 ptr_index_iterator& operator-=(difference_type n) {
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ptr_index_iterator temp(p_, index_ - 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 p_[index_ + n];
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}
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};
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template<typename T1, typename T2, bool C>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_same<typename std::decay<T1>::type, typename std::decay<T2>::type>::value,
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bool
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>::type
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operator==(sprout::ptr_index_iterator<T1, C> const& lhs, sprout::ptr_index_iterator<T2, C> const& rhs) {
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return lhs.index() == rhs.index();
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}
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template<typename T1, typename T2, bool C>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_same<typename std::decay<T1>::type, typename std::decay<T2>::type>::value,
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bool
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>::type
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operator!=(sprout::ptr_index_iterator<T1, C> const& lhs, sprout::ptr_index_iterator<T2, C> const& rhs) {
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return !(lhs == rhs);
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}
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template<typename T1, typename T2, bool C>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_same<typename std::decay<T1>::type, typename std::decay<T2>::type>::value,
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bool
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>::type
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operator<(sprout::ptr_index_iterator<T1, C> const& lhs, sprout::ptr_index_iterator<T2, C> const& rhs) {
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return lhs.index() < rhs.index();
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}
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template<typename T1, typename T2, bool C>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_same<typename std::decay<T1>::type, typename std::decay<T2>::type>::value,
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bool
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>::type
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operator>(sprout::ptr_index_iterator<T1, C> const& lhs, sprout::ptr_index_iterator<T2, C> const& rhs) {
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return rhs < lhs;
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}
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template<typename T1, typename T2, bool C>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_same<typename std::decay<T1>::type, typename std::decay<T2>::type>::value,
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bool
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>::type
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operator<=(sprout::ptr_index_iterator<T1, C> const& lhs, sprout::ptr_index_iterator<T2, C> const& rhs) {
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return !(rhs < lhs);
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}
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template<typename T1, typename T2, bool C>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_same<typename std::decay<T1>::type, typename std::decay<T2>::type>::value,
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bool
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>::type
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operator>=(sprout::ptr_index_iterator<T1, C> const& lhs, sprout::ptr_index_iterator<T2, C> const& rhs) {
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return !(lhs < rhs);
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}
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template<typename T1, typename T2, bool C>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_same<typename std::decay<T1>::type, typename std::decay<T2>::type>::value,
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decltype(
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std::declval<typename std::iterator_traits<sprout::ptr_index_iterator<T1, C> >::difference_type>()
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- std::declval<typename std::iterator_traits<sprout::ptr_index_iterator<T2, C> >::difference_type>()
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)
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>::type
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operator-(sprout::ptr_index_iterator<T1, C> const& lhs, sprout::ptr_index_iterator<T2, C> const& rhs) {
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return lhs.index() - rhs.index();
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}
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template<typename T, bool C>
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inline SPROUT_CONSTEXPR sprout::ptr_index_iterator<T, C>
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operator+(typename sprout::ptr_index_iterator<T, C>::difference_type n, sprout::ptr_index_iterator<T, C> const& it) {
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return it + n;
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}
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//
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// swap
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//
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template<typename T>
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inline SPROUT_CXX14_CONSTEXPR void
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swap(sprout::ptr_index_iterator<T>& lhs, sprout::ptr_index_iterator<T>& 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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// make_ptr_index_iterator
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//
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::ptr_index_iterator<T>
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make_ptr_index_iterator(T* p) {
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return sprout::ptr_index_iterator<T>(p);
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}
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::ptr_index_iterator<T>
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make_ptr_index_iterator(T* p, typename sprout::ptr_index_iterator<T>::difference_type index) {
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return sprout::ptr_index_iterator<T>(p, index);
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}
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//
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// ptr_index
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//
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::ptr_index_iterator<T>
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ptr_index(T* p) {
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return sprout::make_ptr_index_iterator(p);
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}
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::ptr_index_iterator<T>
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ptr_index(T* p, typename std::iterator_traits<T*>::difference_type n) {
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return sprout::make_ptr_index_iterator(p, n);
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}
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template<typename Iterator>
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inline SPROUT_CONSTEXPR Iterator
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ptr_index(Iterator const& it) {
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return it;
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}
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template<typename Iterator>
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inline SPROUT_CONSTEXPR Iterator
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ptr_index(Iterator const& it, typename std::iterator_traits<Iterator>::difference_type n) {
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return sprout::next(it, n);
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}
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//
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// ptr_unindex
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//
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template<typename T>
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inline SPROUT_CONSTEXPR typename sprout::ptr_index_iterator<T>::pointer
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ptr_unindex(sprout::ptr_index_iterator<T> const& it) {
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return it.ptr();
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}
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template<typename Iterator>
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inline SPROUT_CONSTEXPR Iterator
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ptr_unindex(Iterator const& it) {
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return it;
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}
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//
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// is_ptr_index_iterator
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//
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template<typename T>
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struct is_ptr_index_iterator
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: public sprout::false_type
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{};
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template<typename T>
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struct is_ptr_index_iterator<T const>
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: public sprout::is_ptr_index_iterator<T>
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{};
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template<typename T>
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struct is_ptr_index_iterator<T const volatile>
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: public sprout::is_ptr_index_iterator<T>
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{};
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template<typename T>
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struct is_ptr_index_iterator<sprout::ptr_index_iterator<T> >
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: public sprout::true_type
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{};
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//
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// iterator_next
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//
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template<typename T>
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inline SPROUT_CONSTEXPR sprout::ptr_index_iterator<T>
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iterator_next(sprout::ptr_index_iterator<T> 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 T>
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inline SPROUT_CONSTEXPR sprout::ptr_index_iterator<T>
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iterator_prev(sprout::ptr_index_iterator<T> 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_PTR_INDEX_ITERATOR_HPP
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