Object.factory create instance failed?

[Sam Hu]

Sam Hu Wrote:

> The Dmd2.030 spec. said:
> 
> static Object factory(string classname); 
> Create instance of class specified by classname. The class must either have no constructors or have a default constructor. 
> 
> and said also:
> class ClassInfo
> static ClassInfo find(in char[] classname); 
> Search all modules for ClassInfo corresponding to classname. 
> 
> Returns:
> null if not found 
> 
> Object create(); 
> Create instance of Object represented by 'this'. 
> 
> In below code snippet:
> 
> class Dog
> {
> public void bark(){}
> }
> int main(string[] args)
> {
> auto obj=Object.factory("Dog");
> Dog doggie=cast(Dog)obj;
> doggie.bark;
> 
> return 0;
> }
> 
> Compiled successfully but failed when run:
> Object.Error:Access Violation.
> 
> I also tried ClassInfo.find(string classname),ClassInfo.create() but caused the same error.
> 
> In the above code snippet,if I wrote as below:
> class Dog{...}
> int main(string[] args)
> {
> Object obj=Object.factory("Dog");
> obj=new Dog;   //1
> Dog doggie=cast(Dog)obj;//2
> doggie.bark;
> 
> return 0;
> }
> Everything works fine.But it seems that this does not make sense to dynamic create class instance.It is just the same as below:
> Object obj;
> obj=new Dog;
> (cast(Dog)obj).bark;
> 
> So is there any other options can I reach the goal,i.e.,dynamically create an class instance and invoke its method?
> 
> Thanks in advance.
> 
> Regards,
> Sam
> 
> 
BTW,why __traits has no isStaticFunction?
Thanks in advance.