71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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/traits.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 value_type& 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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