add
Adds a relation A -> B if domain does not contain A and coDomain does not contain B. Returns false
if the relation could not be added.
Return
true
if the element was added to the map, false
otherwise.
See also
Adds a relation A -> B if domain does not contain A and coDomain does not contain B. Returns false
if the relation could not be added.
Return
true
if the element was added to the map or already existed, false
otherwise.