Defined in header <algorithm> (1) template< class ForwardIt1, class ForwardIt2 >
ForwardIt1 find_first_of( ForwardIt1 first, ForwardIt1 last,
ForwardIt2 s_first, ForwardIt2 s_last ); (until C++11) template< class InputIt, class ForwardIt >
InputIt find_first_of( InputIt first, InputIt last,
ForwardIt s_first, ForwardIt s_last ); (since C++11) (2) template< class ForwardIt1, class ForwardIt2, class Binary