4a42604cb6
the Arachne type checking. The net result is that a variable of type 'Ticket' can always contain any term, even with -m0 or -m1 matching.
25 lines
694 B
C
25 lines
694 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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#endif
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