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Same as copy_backward, but allows the use of an unchecked iterator as output iterator when _SECURE_SCL=1 is defined. unchecked_copy_backward is defined in the stdext namespace.
This algorithm is a Microsoft extension to the Standard C++ Library. Code implemented using this algorithm will not be portable.
template<class BidirectionalIterator1, class BidirectionalIterator2> BidirectionalIterator2 unchecked_copy_backward( BidirectionalIterator1_First, BidirectionalIterator1 _Last, BidirectionalIterator2 _DestEnd );