Hi Jorges, I think the default constructor is causing you trouble. Your class A always has a default constructor that you have over-ridden with your own defined constructor. To avoid ambiguities, I would also define the default constructor and use it to do the stuff that I want to do with null value of par. HTH, -Lokesh On Mon, May 12, 2008 at 6:10 PM, <jorgesmbox-ml@xxxxxxxx> wrote: > Hi, > I experienced something I consider strange: Let me try to explain by a simpe example: > > Definitions: > > class B; > > class A { > A(B par=0); > } > > Now, if I use: > > A myA(myB); // assume myB is of type B > > then I have an object of type A created, but if I do: > > A myA(); > > Then no object of type A is created. I thought that because of the default value in the constructor, I could create myA > this way, but I get no error nor object. I was beaten by this last week, and it cost me many hours to debug. Am I missing something? Forgive me if the answer is trivial, I am not an expert in c++ and besides I started coding again after more than a year. Pointers are also appreciated, I have the latest Stroustrup's but I just started it and a search didn't answer this question. > > jorges > > > > > ______________________________________________ > Enviado desde Correo Yahoo! La bandeja de entrada más inteligente. > -- "It is not God that is worshipped but the group or authority that claims to speak in His name. Sin becomes disobedience to authority not violation of integrity." Lokesh Kumar Mobile: +1 917 319 0360