er coll .push_back (s) ; copy sinto coll icopy elem into the vect void Push_back(const Te elem) ， coll .push_back (getpata()) ; /lmove temporary into coll /move

any "backing" range. Only 4 in the standard. using namespace std::ranges; auto a = ref_view{ some_vect }; auto b = filter_view{ a, even }; using namespace std::ranges; auto a = iota_view{ 1, 10 };