/* SCCS - @(#)NslBinaryOperator.java 1.4 - 09/01/99 - 00:18:20 */
// Copyright: Copyright (c) 1997 University of Southern California Brain Project.
// Copyright: This software may be freely copied provided the toplevel
// Copyright: COPYRIGHT file is included with each such copy.
// Copyright: Email nsl@java.usc.edu.
////////////////////////////////////////////////////////////
//
// Binary operator routines
//
//
package nslj.src.math;
import nslj.src.lang.*;
/**
Binary operator routines.
There are two basic format for the evaluation method in
this routine:
1, eval(a, b) -> c
a, b are the parameter of the evaluation function to do
a operator b pointwise and the result is passed out as c
2. eval(dest, a, b) -> c
a, b are the parameter of the evaluation function and
dest is the temporary space to hold the result.
The method returns the reference to dest.
*/
public abstract class NslBinaryOperator extends NslBase {
public NslBinaryOperator() {
super();
}
public NslBinaryOperator(String label, NslHierarchy parent) {
super(label,parent);
}
public abstract int value(int a, int b);
public abstract float value(float a, float b);
public abstract double value(double a, double b);
// 0d native ints
public int eval(int a, int b) {
return value(a,b);
}
// 1d native ints
public int[] eval(int[] a, int b) {
int[] dest = new int[a.length];
return eval(dest, a, b);
}
public int[] eval(int[] dest, int[] a, int b) {
int i;
int len = dest.length;
if (len != a.length ) {
len = a.length;
dest = new int[len];
}
for (i=0; i