adjacent_find

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adjacent_find

template<class FwdIt>
    FwdIt adjacent_find(FwdIt first, FwdIt last);
template<class FwdIt, class Pred>
    FwdIt adjacent_find(FwdIt first, FwdIt last, Pred pr);

The first template function determines the lowest N in the range [0, last - first) for which N + 1 != last - first and the predicate *(first + N) == *(first + N + 1) is true. It then returns first + N. If no such value exists, the function returns last. It evaluates the predicate exactly N + 1 times.

The second template function behaves the same, except that the predicate is pr(*(first + N), *(first + N + 1)).

Sample programs: adjacent_find and adjacent_find (predicate version).