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Заголовок

template <class Iterator>
struct iterator_value
{
    typedef typename
      std::iterator_traits<Iterator>::value_type
    type;
};
template <class Iterator>
struct iterator_reference
{
    typedef typename
      std::iterator_traits<Iterator>::reference
    type;
};
template <class Iterator>
struct iterator_pointer
{
    typedef typename
      std::iterator_traits<Iterator>::pointer
    type;
};
template <class Iterator>
struct iterator_difference
{
    typedef typename
      detail::iterator_traits<Iterator>::difference_type
    type;
};
template <class Iterator>
struct iterator_category
{
    typedef typename
      detail::iterator_traits<Iterator>::iterator_category
    type;
};