IndexIterator.h

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#ifndef INDEXITERATOR_HEADER
#define INDEXITERATOR_HEADER
#include <iterator>
 
#ifndef DLL_LINKAGE
#define DLL_LINKAGE
#endif
 
class DLL_LINKAGE IndexIterator
{
public:
    typedef const size_t value_type;
    typedef value_type* pointer;
    typedef value_type& reference;
    typedef std::forward_iterator_tag iterator_category;
    typedef size_t size_type;
    typedef size_t difference_type;
    IndexIterator() {}
    IndexIterator(size_t index) : m_index(index) {}
    const size_t operator*() const
    {
        return m_index;
    }
    const size_t* operator->() const
    {
        return &m_index;
    }
    IndexIterator& operator++()
    {
        ++m_index;
        return *this;
    }
    IndexIterator operator++(int)
    {
        size_t save = m_index;
        ++m_index;
        return IndexIterator(save);
    }
    bool operator==(IndexIterator a) const
    {
        return m_index == a.m_index;
    }
    bool operator!=(IndexIterator a) const
    {
        return m_index != a.m_index;
    }
    IndexIterator& operator+=(size_t offset)
    {
        m_index += offset;
        return *this;
    }
    IndexIterator& operator-=(size_t offset)
    {
        m_index -= offset;
        return *this;
    }
    IndexIterator operator+(size_t offset) const
    {
        return IndexIterator(m_index + offset);
    }
    IndexIterator operator-(size_t offset) const
    {
        return IndexIterator(m_index - offset);
    }
    size_t operator-(IndexIterator i) const
    {
        return m_index - i.m_index;
    }
 
    size_t operator[](size_t i) const
    {
        return m_index + i;
    }
 
private:
    size_t m_index;
};
 
#endif