If you declare a delegate with a default value, the closure for that default value is broken. See this code:



class Test_delegates : Object {
    public delegate string delegateType1(string param);


    public delegateType1 mydelegate=defaultfun; //This default initialization is badly made. The closure does not include the current instance of Test_delegates

    public Test_delegates(){
        //mydelegate = defaultfun; //This initialization works. Uncomment to see it working.
    }

    public string defaultfun(string param){
        stdout.printf("defaultfun received %s\n", param);
        string retorno = "### %s ###".printf(param);
        stdout.printf("defaultfun returns %s\n", retorno);
        return retorno;
    }

    public string otherfun(string param){
        stdout.printf("otherfun received %s\n", param);
        string retorno = "@@@ %s @@@".printf(param);
        stdout.printf("otherfun returns %s\n", retorno);
        return retorno;
    }

    public void run(){
        string result = mydelegate("blebleble");
        stderr.flush();
        stdout.printf("mydelegate returned %s\n", result);
        mydelegate=otherfun;
        result = mydelegate("blebleble");
        stdout.printf("mydelegate returned %s\n", result);
    }
}


void main(){
    var t1=new Test_delegates();
    t1.run();
}



Shows:
** (process:8090): CRITICAL **: test_delegates_defaultfun: assertion `self != NULL' failed