SP_unify()
#include <sicstus/sicstus.h> int SP_unify(SP_term_ref x, SP_term_ref y)
Unifies two terms.
1 if they unify, and 0 otherwise.
Bear in mind that the unification may unblock some goals.
such goals are not run in the scope of SP_unify()
;
they remain pending until the next Prolog goal is run.