10.38.md

Iterator Category	Supported Operations
input iterator	== != ++ *(only on rhs) -> single-pass
output iterator	++ *(only on lhs) single-pass
forward iterator	input&output iterator operations multi-pass
bidirectional iterator	forward iterator operations --
random-access iterator	bidirectional iterator operations < <= > >= + += -(iter-integral, iter-iter) -= []

Iterator Hierarchy

    input iterator          output iterator
          |
   forward iterator
          |
bidirectional iterator
          |
random-access iterator