On Mar 14, 2007, at 8:40 PM, Eithon Cadag wrote:
Hi all,
Is binding a lambda function to a variable, and then using that
function, possible in Jess?
You know, I don't think there *is* a way to do this. You can use the
"map" function, but you'll get back the answer inside a list, which
isn't terribly convenient. The "apply" function should be modified to
handle lambdas as well as names. Here's a version of "apply" which
does the right thing:
--------------------------------------------------------------
class Apply implements Userfunction, Serializable {
public String getName() {
return "apply";
}
public Value call(ValueVector vv, Context context) throws
JessException {
Userfunction uf = vv.get(1).functionValue(context);
ValueVector args = new ValueVector();
args.add(uf.getName());
for (int i = 2; i < vv.size(); i++)
args.add(vv.get(i));
return uf.call(args, context);
}
}
--------------------------------------------------------------
Then (apply ?fnc 2) would return "4".
---------------------------------------------------------
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
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