overriding a function that hasan optional parameter in ActionScript / Flex

Question

I'm using FlashBuilder 4 beta2. My base class has a function foo():

protected function foo(s:String, z:String=null): void{}

Literally "foo" so that there's no chance I'm stepping on a built-in method. I am getting an "Incompatible override" error when attempting to override the method in a subclass:

override protected function foo(s:String, z:String=null): void{}

Does the optional parameter do something "behind the scenes" that makes it illegal to override the method?

Thanks

T.

Answer 1

Never seen an issue like that before. Maybe you want to copy/paste your function from the base class into your extended class and add the "override" then. I have a feeling your method signatures don't match.

BaseClass.as

package {   
    public class BaseClass {
        protected function foo(s:String, z:String = null) {
            // implement in derived class
        }
    }
}

SubClass.as

package {
    public class SubClass extends BaseClass {

        override protected function foo(s:String, z:String = null) {
            trace("s = " + s);
            trace("z = " + z);
        }

        public function bar(s:String, z:String = null) {
            foo(s, z);
        }
    }
}

Then elsewhere:

var c:SubClass = new SubClass();
c.bar("string1", "string2");

traces

s = string1
z = string2