IntegerBiDirIterator.hpp

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/*
 * This file is part of the DUDS project. It is subject to the BSD-style
 * license terms in the LICENSE file found in the top-level directory of this
 * distribution and at https://github.com/jjackowski/duds/blob/master/LICENSE.
 * No part of DUDS, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 *
 * Copyright (C) 2017  Jeff Jackowski
 */
#ifndef INTEGERBIDIRITERATOR_HPP
#define INTEGERBIDIRITERATOR_HPP

#include <iterator>

namespace duds { namespace general {

template <typename Int>
class IntegerBiDirIterator {
    Int val;
public:
    typedef std::bidirectional_iterator_tag iterator_category;
    typedef Int value_type;
    typedef int difference_type;
    typedef value_type* pointer;
    typedef value_type& reference;
    IntegerBiDirIterator() = default;
    IntegerBiDirIterator(Int i) : val(i) { }
    IntegerBiDirIterator &operator++() {
        ++val;
        return *this;
    }
    IntegerBiDirIterator operator++(int) {
        return IntegerBiDirIterator(val++);
    }
    IntegerBiDirIterator &operator--() {
        --val;
        return *this;
    }
    IntegerBiDirIterator operator--(int) {
        return IntegerBiDirIterator(val--);
    }
    Int operator * () const {
        return val;
    }
    bool operator != (const IntegerBiDirIterator &i) const {
        return val != i.val;
    }
};

} }

#endif        //  #ifndef INTEGERBIDIRITERATOR_HPP