46 lines
1.0 KiB
Prolog
46 lines
1.0 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: terms.yap *
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* Last rev: 5/12/99 *
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* mods: *
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* comments: Term manipulation operations *
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* *
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*************************************************************************/
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:- module(terms, [
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term_hash/2,
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term_hash/4,
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instantiated_term_hash/4,
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variant/2,
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unifiable/3,
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subsumes/2,
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subsumes_chk/2,
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cyclic_term/1,
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acyclic_term/1,
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variable_in_term/2
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]).
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term_hash(T,H) :-
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term_hash(T, -1, 33554432, H).
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%term_hash(X,Y) :-
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% term_hash(X,-1,16'1000000,Y).
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subsumes_chk(X,Y) :-
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\+ \+ subsumes(X,Y).
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unifiable(X,Y,Z) :-
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protected_unifiable(X,Y,Z), !.
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unifiable(_,_,_) :- fail.
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