blob: c6a7b8933cd48566a0b506366204f0f88c77a81e [file] [log] [blame]
package com.googlecode.prolog_cafe.builtin;
import com.googlecode.prolog_cafe.lang.IntegerTerm;
import com.googlecode.prolog_cafe.lang.Operation;
import com.googlecode.prolog_cafe.lang.Predicate;
import com.googlecode.prolog_cafe.lang.Prolog;
import com.googlecode.prolog_cafe.lang.Term;
/**
* <code>'$get_current_B'/1</code><br>
* @author Mutsunori Banbara (banbara@kobe-u.ac.jp)
* @author Naoyuki Tamura (tamura@kobe-u.ac.jp)
* @version 1.0
*/
class PRED_$get_current_B_1 extends Predicate.P1 {
public PRED_$get_current_B_1(Term a1, Operation cont) {
arg1 = a1;
this.cont = cont;
}
@Override
public Operation exec(Prolog engine) {
engine.setB0();
Term a1;
a1 = arg1;
if (! a1.unify(new IntegerTerm(engine.stack.top()), engine.trail))
return engine.fail();
return cont;
}
}