An insert iterator is constructed from a container and possibly one of its iterators pointing to where
insertion takes place if it is neither at the beginning nor at the end of the container
. Insert iterators meet the requirements of output iterators
. operator*
returns the insert iterator itself
. The assignment
operator=(const T& x)
is defined on insert iterators to allow writing into them, it inserts
x
right before where the insert iterator is pointing
. In other words, an insert iterator is like a cursor pointing into the
container where the insertion takes place
. back_insert_iterator
inserts elements at the end of a container,
front_insert_iterator
inserts elements at the beginning of a container, and
insert_iterator
inserts elements where the iterator points to in a container
. back_inserter,
front_inserter,
and
inserter
are three
functions making the insert iterators out of a container
.