Re: C# versus C++ Constructor Problem

I'll just add that you should never call virtual methods in
destructors too (in C++).

On 6/22/06, Peter Ritchie <[email protected]> wrote:
> BTW, you may be interested in the following references:
> http://blogs.msdn.com/abhinaba/archive/2006/02/28/540357.aspx
> http://blogs.msdn.com/scottwil/archive/2005/01/14/353177.aspx
> http://www.artima.com/cppsource/nevercall.html
>
> As well as Scott Meyer's Effective C++; he discusses calling virtual
> methods in c'tors (and why you shouldn't)
>
> On Thu, 22 Jun 2006 11:09:02 -0400, David Thompson
> <[email protected]> wrote:
>
> >I'm converting some C++ code to C# and have found something that I'd like
> some clarification on.
> >If I define the following:
> >
> >public class Class1
> >{
> >    public Class1()
> >    {
> >         initialize();
> >    }
> >
> >    public virtual void initialize()
> >    {
> >         // Do something
> >    }
> >
> >}
> >
> >public class Class2 : Class1
> >{
> >     private SomeOtherClass soc;
> >     public Class2() { soc = new SomeOtherClass(); }
> >
> >     public override void initialize()
> >     {
> >           base.initialize();
> >           soc.SomeFunction();   // error here.
> >     }
> >}
> >
> >Now looking at this, in C++ the callstack when creating a new Class2 is:
> >
> >Class2()
> >Class1()
> >Class1::initialize()
> >
> >but in C# the stack becomes:
> >Class2()
> >Class1()
> >Class2.initialize()
> >
> >Now since Class2's constructor hasn't completed yet, then soc doesn't
> exist and an exception is
> >thrown because soc doesn't exist yet.
> >
> >Is there any way to get the C++ behavior in C# or do I have to look at re-
> writing the code? I think I
> >understand why it happens (dealing with the type information on the
> class), but it doesn't seem
> >correct. Anybody got some advice?
>
> ===================================
> This list is hosted by DevelopMentor(r)  http://www.develop.com
>
> View archives and manage your subscription(s) at http://discuss.develop.com
>


--

Cheers,
Stoyan

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com