Template:cpp/container/node handle insert desc

@@ If  is an empty node handle, does nothing. Otherwise, inserts the element owned by into the container. The behavior is undefined if is not empty and.

@@ If is an empty node handle, does nothing and returns the end iterator. Otherwise, inserts the element owned by into the container, and returns the iterator pointing to the element with key equivalent to. The behavior is undefined if is not empty and.