[fpc-pascal] Is it possible to know the data type of a specialized generics class?

[Sven Barth]

Am 24.09.2013 11:19, schrieb Xiangrong Fang:
> Hi All,
>
> say, I have a class TTree<T>; in the destructor of that class, is it 
> possible to know the actual type of T? I want to do things like:
>
> generic TTree<T> = class
> public
>   Data: T;
> destructor Destroy; override;
> end;
>
> destructor TTree.Destroy;
> begin
>   ... ...
>   if Data is TObject then Data.Free;
> end;
>
> But "is" does not work with generic types.
>
Short answer: No
Long answer: You could try to use TypeInfo(Data) or TypeInfo(T) and use 
the returned PTypeInfo to find out the type...

Regards,
Sven
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