mode/2
mode(Mode, Number_of_solutions)Most predicates can be used with several instantiations modes. This directive enables the specification of each instantiation mode and the corresponding number of solutions/proofs.
mode(+predicate_mode_term, +number_of_solutions)
:- mode(append(-, -, +), zero_or_more). :- mode(append(+list, +list, -list), zero_or_one). :- mode(var(@term), zero_or_one). :- mode(arg(-, -, +), error).
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Last updated on: August 6, 2002