Returns the object that has received the message under processing. This private method is translated to a unification between its argument and the corresponding implicit context argument in the predicate clause making the call. This unification occurs at the clause head when the argument is not instantiated (the most common case).
Modes and number of proofs
self(?object_identifier) - zero_or_one
% upon compilation, the write/1 call will be % the first goal on the clause body test :- self(Self), write('executing a method in behalf of '), writeq(Self), nl.