internal method

using GLib;

public static void main(string[] args){
    var toto = new Toto();
    toto.internal_print();
    var sub = new SubToto();
    sub.internal_print();
}

public class Toto : GLib.Object
{
    public Toto(){}

    public string internal_print(){
        if(get_type().name() != "Toto")return null;
        return "print only in Toto instance\n";
    }

    public string s{get;set;}
    public int i{get;set;}
}

public class SubToto : Toto
{
    public void test(){
        stdout.printf("test\n");
    }
}