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|apply_macros.pl -- Goal expansion rules to avoid meta-calling|
This module defines goal_expansion/2 rules to deal with commonly used, but fundamentally slow meta-predicates. Notable maplist/2... defines a useful set of predicates, but its execution is considerable slower than a traditional Prolog loop. Using this library calls to maplist/2... are translated into an call to a generated auxiliary predicate that is compiled using compile_aux_clauses/1. Currently this module supports:
The idea for this library originates from ECLiPSe and came to SWI-Prolog through YAP.
once(Goal)cannot be translated to
(Goal->true)because this will break the compilation of
(once(X) ; Y). A correct translation is to
(Goal->true;fail). Abramo Bagnara suggested
((Goal->true),true), which is both faster and avoids warning if
?- expand_phrase(phrase(("ab", rule)), List), Goal). Goal = (List=[97, 98|_G121], rule(_G121, )).