[Mono-dev] Segfault on base class method access

[Zoltan Varga]

Hey,

(this as A).ToString () still calls C's ToString () method, so you
will get infinite recursion and a stack overflow leading to this
crash.

              Zoltan

On Nov 28, 2007 4:13 PM, Paul Melis <paul at science.uva.nl> wrote:
> Hello,
>
> I tried to register at the bug tracker, but did not receive a
> confirmation mail, so I post here instead.
>
> When running the code below mono 1.2.5.2 segfaults. The stack trace is
> not enlightening.
> The use case here is to prefix a class's string representation with its
> base class's string representation.
> I know about "base", but I figured it only gives you the direct parent
> and not the parent-of-parent.
> Btw, if class A is removed (also as base class to B) then this code
> still segfaults. It seems to be the "this as ..." that's the problem.
>
> Regards,
> Paul
>
>
> using System;
>
> class A
> {
>     public override string ToString()
>     {
>         return "A";
>     }
> };
>
> class B : A
> {
>     public override string ToString()
>     {
>         return "B";
>     }
> };
>
> class C : B
> {
>     public override string ToString()
>     {
>         return String.Format("({0}) C", (this as A).ToString());
>     }
> };
>
> class MainClass
> {
>     public static void Main(string[] args)
>     {
>         C c;
>
>         c = new C();
>         Console.WriteLine("{0}", c);
>     }
> }
>
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