boost::gil::memunit_advance

template<typename NonAlignedPixelReference>
void
memunit_advance(
    bit_aligned_pixel_iterator<NonAlignedPixelReference>& p,
    std::ptrdiff_t diff);

template<typename Iterator>
void
memunit_advance(
    memory_based_step_iterator<Iterator>& p,
    std::ptrdiff_t diff);

template<typename P>
void
memunit_advance(
    P*& p,
    std::ptrdiff_t diff);

template<
    typename Iterator,
    typename DFn>
void
memunit_advance(
    dereference_iterator_adaptor<Iterator, DFn>& p,
    std::iterator_traits<Iterator>::difference_type diff);

template<
    typename IC,
    typename C>
void
memunit_advance(
    planar_pixel_iterator<IC, C>& p,
    std::ptrdiff_t diff);