With one exception, the container types have three size-related operations. The size
member (§ 3.2.2, p. 87) returns the number of elements in the container; empty
returns a bool
that is true
if size
is zero and false
otherwise; and max_size
returns a number that is greater than or equal to the number of elements a container of that type can contain. For reasons we’ll explain in the next section, forward_list
provides max_size
and empty
, but not size
.