30 lines
913 B
C
30 lines
913 B
C
#ifndef MGU
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#define MGU
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#include "term.h"
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#include "termlist.h"
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#include "substitution.h"
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//! A special constant do denote failure.
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/**
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* \c NULL already denotes equality, so an extra signal is needed to
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* denote that a unification fails.
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* \todo Find a portable solution for this \c MGUFAIL constant:
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* maybe a pointer to some special constant.
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*/
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#define MGUFAIL (Termlist) -1
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void setMguMode (const int mgu);
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Termlist termMguTerm (Term t1, Term t2);
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int termMguInTerm (Term t1, Term t2, int (*iterator) (Termlist));
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int termMguSubTerm (Term t1, Term t2, int (*iterator) (Termlist, Termlist),
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Termlist inverses, Termlist keylist);
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void termlistSubstReset (Termlist tl);
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// The new iteration methods
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int unify (Term t1, Term t2, Termlist tl, int (*callback) (Termlist));
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int
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subtermUnify (Term tbig, Term tsmall, Termlist tl, Termlist keylist,
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int (*callback) (Termlist, Termlist));
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#endif
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