Function back

benchmarks/tbb/concurrent_vector.h:983–986

the last item

    }
    //! the last item
    reference back() {
        __TBB_ASSERT( size()>0, NULL);
        return internal_subscript( size()-1 );
    }
    //! the last item const
    const_reference back() const {
        __TBB_ASSERT( size()>0, NULL);