public override Predicate exec( Prolog engine ) { Term a1, a2, a3, a4; Predicate p1; a1 = engine.aregs[1].Dereference(); a2 = engine.aregs[2].Dereference(); a3 = engine.aregs[3].Dereference(); a4 = engine.aregs[4].Dereference(); Predicate cont = engine.cont; if ( !s1.Unify(a3, engine.trail) ) return engine.fail(); p1 = new Predicates.Close_Line_4(a1, a2, s1, a4, cont); return new Predicates.Free_Line_3(a1, a2, s1, p1); }
public override Predicate exec( Prolog engine ) { Term a1, a2, a3, a4, a5, a6; Predicate p1, p2, p3, p4, p5; a1 = engine.aregs[1].Dereference(); a2 = engine.aregs[2].Dereference(); a3 = engine.aregs[3].Dereference(); a4 = engine.aregs[4].Dereference(); Predicate cont = engine.cont; if ( !s1.Unify(a3, engine.trail) ) return engine.fail(); if ( !s2.Unify(a4, engine.trail) ) return engine.fail(); a5 = engine.makeVariable(); a6 = engine.makeVariable(); p1 = new Predicates.Close_Line_4(a1, a2, s1, s4, cont); p2 = new Predicates.Line_3(a6, a1, s3, p1); p3 = new Predicates.dollar_plus_3(a2, s3, a6, p2); p4 = new Predicates.Line_3(a2, a1, s3, p3); p5 = new Predicates.Line_3(a5, a2, s1, p4); return new Predicates.dollar_plus_3(a1, s3, a5, p5); }