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156 lines
4.1 KiB
C++
156 lines
4.1 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2014-2014
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/intrusive for documentation.
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//
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/////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTRUSIVE_DETAIL_ITERATOR_HPP
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#define BOOST_INTRUSIVE_DETAIL_ITERATOR_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <cstddef>
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#include <boost/intrusive/detail/std_fwd.hpp>
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#include <boost/move/detail/iterator_traits.hpp>
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#include <boost/move/detail/meta_utils_core.hpp>
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namespace boost {
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namespace intrusive {
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using boost::movelib::iterator_traits;
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////////////////////
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// iterator
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////////////////////
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template<class Category, class T, class Distance, class Pointer = T*, class Reference = T&>
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struct iterator
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{
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typedef Category iterator_category;
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typedef T value_type;
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typedef Distance difference_type;
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typedef Pointer pointer;
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typedef Reference reference;
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};
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////////////////////////////////////////
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// iterator_[dis|en]able_if_tag
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////////////////////////////////////////
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template<class I, class Tag, class R = void>
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struct iterator_enable_if_tag
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: ::boost::move_detail::enable_if_c
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< ::boost::move_detail::is_same
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< typename boost::intrusive::iterator_traits<I>::iterator_category
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, Tag
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>::value
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, R>
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{};
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template<class I, class Tag, class R = void>
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struct iterator_disable_if_tag
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: ::boost::move_detail::enable_if_c
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< !::boost::move_detail::is_same
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< typename boost::intrusive::iterator_traits<I>::iterator_category
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, Tag
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>::value
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, R>
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{};
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////////////////////////////////////////
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// iterator_[dis|en]able_if_tag_difference_type
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////////////////////////////////////////
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template<class I, class Tag>
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struct iterator_enable_if_tag_difference_type
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: iterator_enable_if_tag<I, Tag, typename boost::intrusive::iterator_traits<I>::difference_type>
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{};
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template<class I, class Tag>
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struct iterator_disable_if_tag_difference_type
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: iterator_disable_if_tag<I, Tag, typename boost::intrusive::iterator_traits<I>::difference_type>
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{};
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////////////////////
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// advance
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////////////////////
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template<class InputIt, class Distance> inline
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typename iterator_enable_if_tag<InputIt, std::input_iterator_tag>::type
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iterator_advance(InputIt& it, Distance n)
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{
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while(n--)
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++it;
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}
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template<class InputIt, class Distance> inline
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typename iterator_enable_if_tag<InputIt, std::forward_iterator_tag>::type
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iterator_advance(InputIt& it, Distance n)
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{
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while(n--)
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++it;
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}
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template<class InputIt, class Distance> inline
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typename iterator_enable_if_tag<InputIt, std::bidirectional_iterator_tag>::type
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iterator_advance(InputIt& it, Distance n)
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{
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for (; 0 < n; --n)
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++it;
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for (; n < 0; ++n)
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--it;
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}
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template<class InputIt, class Distance> inline
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typename iterator_enable_if_tag<InputIt, std::random_access_iterator_tag>::type
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iterator_advance(InputIt& it, Distance n)
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{
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it += n;
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}
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////////////////////
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// distance
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////////////////////
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template<class InputIt> inline
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typename iterator_disable_if_tag_difference_type
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<InputIt, std::random_access_iterator_tag>::type
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iterator_distance(InputIt first, InputIt last)
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{
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typename iterator_traits<InputIt>::difference_type off = 0;
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while(first != last){
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++off;
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++first;
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}
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return off;
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}
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template<class InputIt> inline
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typename iterator_enable_if_tag_difference_type
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<InputIt, std::random_access_iterator_tag>::type
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iterator_distance(InputIt first, InputIt last)
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{
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typename iterator_traits<InputIt>::difference_type off = last - first;
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return off;
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}
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template<class I>
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typename iterator_traits<I>::pointer iterator_arrow_result(const I &i)
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{ return i.operator->(); }
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template<class T>
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T * iterator_arrow_result(T *p)
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{ return p; }
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} //namespace intrusive
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} //namespace boost
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#endif //BOOST_INTRUSIVE_DETAIL_ITERATOR_HPP
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