Method iterator

inst/include/Rcpp/vector/MatrixBase.h:91–95

            typedef std::random_access_iterator_tag iterator_category ;

            iterator( const MatrixBase& object_, R_xlen_t index_ ) :
                object(object_), i(0), j(0), nr(object_.nrow()), nc(object_.ncol()) {

                update_index( index_) ;
            }

            iterator( const iterator& other) :
                object(other.object), i(other.i), j(other.j), nr(other.nr), nc(other.nc){}