The documentation of the mistmatch function contains several errors. The prototypes return a pair of iterators, but the description talk about The versions of mismatch that return an iterator or a range_return. Could this be improved for 1.43 release or it is better I make a ticket? "Description The versions of mismatch that return an iterator, return an iterator to the first position where rng1 and rng2 differ. Equality is determined by operator== for non-predicate versions of mismatch, and by satisfying pred in the predicate versions. The versions of mismatch that return a range_return, defines found in the same manner as the returned iterator described above." Best, _____________________ Vicente Juan Botet Escribá http://viboes.blogspot.com/