mirror of
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177 lines
5 KiB
C++
177 lines
5 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2007-2013
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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_TRANSFORM_ITERATOR_HPP
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#define BOOST_INTRUSIVE_DETAIL_TRANSFORM_ITERATOR_HPP
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/intrusive/detail/config_begin.hpp>
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#include <boost/intrusive/detail/mpl.hpp>
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namespace boost {
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namespace intrusive {
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namespace detail {
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template <class PseudoReference>
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struct operator_arrow_proxy
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{
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operator_arrow_proxy(const PseudoReference &px)
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: m_value(px)
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{}
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PseudoReference* operator->() const { return &m_value; }
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// This function is needed for MWCW and BCC, which won't call operator->
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// again automatically per 13.3.1.2 para 8
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// operator T*() const { return &m_value; }
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mutable PseudoReference m_value;
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};
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template <class T>
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struct operator_arrow_proxy<T&>
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{
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operator_arrow_proxy(T &px)
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: m_value(px)
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{}
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T* operator->() const { return &m_value; }
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// This function is needed for MWCW and BCC, which won't call operator->
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// again automatically per 13.3.1.2 para 8
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// operator T*() const { return &m_value; }
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T &m_value;
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};
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template <class Iterator, class UnaryFunction>
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class transform_iterator
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: public boost::intrusive::iterator
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< typename Iterator::iterator_category
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, typename detail::remove_reference<typename UnaryFunction::result_type>::type
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, typename Iterator::difference_type
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, operator_arrow_proxy<typename UnaryFunction::result_type>
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, typename UnaryFunction::result_type>
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{
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public:
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explicit transform_iterator(const Iterator &it, const UnaryFunction &f = UnaryFunction())
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: members_(it, f)
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{}
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explicit transform_iterator()
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: members_()
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{}
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Iterator get_it() const
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{ return members_.m_it; }
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//Constructors
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transform_iterator& operator++()
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{ increment(); return *this; }
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transform_iterator operator++(int)
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{
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transform_iterator result (*this);
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increment();
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return result;
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}
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friend bool operator== (const transform_iterator& i, const transform_iterator& i2)
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{ return i.equal(i2); }
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friend bool operator!= (const transform_iterator& i, const transform_iterator& i2)
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{ return !(i == i2); }
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/*
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friend bool operator> (const transform_iterator& i, const transform_iterator& i2)
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{ return i2 < i; }
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friend bool operator<= (const transform_iterator& i, const transform_iterator& i2)
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{ return !(i > i2); }
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friend bool operator>= (const transform_iterator& i, const transform_iterator& i2)
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{ return !(i < i2); }
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*/
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friend typename Iterator::difference_type operator- (const transform_iterator& i, const transform_iterator& i2)
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{ return i2.distance_to(i); }
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//Arithmetic
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transform_iterator& operator+=(typename Iterator::difference_type off)
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{ this->advance(off); return *this; }
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transform_iterator operator+(typename Iterator::difference_type off) const
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{
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transform_iterator other(*this);
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other.advance(off);
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return other;
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}
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friend transform_iterator operator+(typename Iterator::difference_type off, const transform_iterator& right)
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{ return right + off; }
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transform_iterator& operator-=(typename Iterator::difference_type off)
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{ this->advance(-off); return *this; }
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transform_iterator operator-(typename Iterator::difference_type off) const
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{ return *this + (-off); }
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typename UnaryFunction::result_type operator*() const
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{ return dereference(); }
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operator_arrow_proxy<typename UnaryFunction::result_type>
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operator->() const
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{ return operator_arrow_proxy<typename UnaryFunction::result_type>(dereference()); }
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private:
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struct members
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: UnaryFunction
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{
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members(const Iterator &it, const UnaryFunction &f)
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: UnaryFunction(f), m_it(it)
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{}
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members()
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{}
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Iterator m_it;
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} members_;
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void increment()
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{ ++members_.m_it; }
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void decrement()
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{ --members_.m_it; }
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bool equal(const transform_iterator &other) const
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{ return members_.m_it == other.members_.m_it; }
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bool less(const transform_iterator &other) const
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{ return other.members_.m_it < members_.m_it; }
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typename UnaryFunction::result_type dereference() const
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{ return members_(*members_.m_it); }
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void advance(typename Iterator::difference_type n)
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{ boost::intrusive::iterator_advance(members_.m_it, n); }
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typename Iterator::difference_type distance_to(const transform_iterator &other)const
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{ return boost::intrusive::iterator_distance(other.members_.m_it, members_.m_it); }
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};
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} //namespace detail
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} //namespace intrusive
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} //namespace boost
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#include <boost/intrusive/detail/config_end.hpp>
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#endif //BOOST_INTRUSIVE_DETAIL_TRANSFORM_ITERATOR_HPP
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