template<class InIt, class OutIt, class Pred>
OutIt remove_copy_if(InIt first, InIt last, OutIt x, Pred pr);The template function effectively executes the statement:
if (!pr(*(first + N)))
*x++ = *(first + N);once for each N in the range [0, last - first). It then returns x. Thus, the function removes from the sequence all
elements for which the predicate pr(*(first + N)) is true, without altering the relative order of remaining elements,
and returns the iterator value that designates the end of the revised sequence.
If x and first designate regions of storage, the range [x, x + (last - first)) must not overlap the range
[first, last).
See the related sample program.