template
OutputIterator adjacent_difference(InputIterator first, InputIterator last,
OutputIterator result);
template
OutputIterator adjacent_difference(InputIterator first, InputIterator last,
OutputIterator result,
BinaryOperation binary_op);
adjacent_difference assigns to every element referred to
by iterator i
in the range [result + 1, result + (last - first)) a value
correspondingly equal to
*(first + (i - result)) - *(first + (i - result) - 1)
or binary_op(*(first + (i - result)), *(first + (i - result) - 1)).
result gets the value of *first.
adjacent_difference returns
result + (last - first).
Exactly (last - first) - 1 applications of
binary_op are performed.
binary_op is expected not to have any side effects.
result may be equal to first.
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