74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010-2012 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_ITERATOR_HPP
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#define __UTIL_ITERATOR_HPP
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#include "types.hpp"
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template <typename Base>
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class referencing_iterator {
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protected:
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typedef typename std::enable_if<
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is_dereferencable<
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typename Base::value_type
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>::value,
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typename Base::value_type
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>::type base_value_type;
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public:
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typedef typename dereferenced_type<base_value_type>::type value_type ;
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typedef typename Base::difference_type difference_type ;
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typedef value_type& reference ;
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typedef value_type* pointer;
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typedef typename Base::iterator_category iterator_category;
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protected:
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Base m_base;
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public:
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explicit referencing_iterator (Base _base):
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m_base (_base)
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{ ; }
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referencing_iterator& operator++() { ++m_base; return *this; }
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referencing_iterator operator++(int) { auto val = *this; ++m_base; return val; }
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bool operator== (const referencing_iterator<Base> &rhs) { return m_base == rhs.m_base; }
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bool operator!= (const referencing_iterator<Base> &rhs) { return m_base != rhs.m_base; }
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bool operator>= (const referencing_iterator<Base> &rhs) { return m_base >= rhs.m_base; }
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bool operator<= (const referencing_iterator<Base> &rhs) { return m_base <= rhs.m_base; }
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bool operator> (const referencing_iterator<Base> &rhs) { return m_base > rhs.m_base; }
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bool operator< (const referencing_iterator<Base> &rhs) { return m_base < rhs.m_base; }
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const reference operator*() const
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{ return **m_base; }
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reference operator*()
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{ return **m_base; }
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difference_type operator-(const referencing_iterator<Base>& rhs) const { return m_base - rhs.m_base; }
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referencing_iterator<Base> operator-(int rhs) const { return referencing_iterator (m_base - rhs); }
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referencing_iterator<Base> operator+(int rhs) const { return referencing_iterator (m_base + rhs); }
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};
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#endif
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