determining if a void* points to a valid Object

[Luís Marques]

BCS wrote:
> void* ptr;
> // set ptr;
> if(null !is cast(Object)ptr)
> {
>     // ptr is an object
> }
> 
> This should work because type checking is done on object up cast.
> 
> However it dosn't seem to work.

According to my experience, from void* to any type it always works. Only 
from Object to subclasses (or among other types, I guess) it actually 
does type checking. So if you want to force a cast to another 
incompatible classe you can do "cast(OtherClass)cast(void*)".

Luís