[IronPython] [AVG SPAM] inheriting from "base" generic type

[Steve Holden]

Dino's at PyCon? Shit, this conference is getting too large!

If you're still here, Dino (and Ronnie too, come to that) try and find 
me to say hello.

regards
  Steve

Ronnie Maor wrote:
> Hi Dino,
> 
> asked you about this at pycon. posting it here per our discussion to 
> help track it.
> I understand it's not high on your priority list (and shouldn't be, 
> considering the other stuff there)
> 
> details:
> 
> have a python class (simplified here) that is a wrapper over an event:
> class Future(object):
>     def set(self,val) # set from one thread
>     def get(self) # blocking until set. returns the value set.
> 
> I exposed the class to C# code through a template interface:
> interface IFuture<T>
>     void set(T val)
>     T get()
> 
> the interaction in our case is that C# calls python, which returns a 
> future, which C# then waits on:
> interface MyPythonSubsystem:
>     IFuture<int> get_an_int()
> 
> Ideally I'd say that Future implements IFuture<T> for any T, by having 
> Future inherit from IFuture in python. I hoped this would mean 
> IronPython would accept my Future object when I returned it from the 
> python implementation of get_an_int().
> Unfortunately, this isn't possible, and I could only inherit from 
> IFuture[T] for some specific T.
> 
> Ended up writing a simple function at the boundary between the 
> subsystems which gets T as an argument, and constructs an adapter that 
> inherits from IFuture<T> and proxies to an underlying Future object. It 
> works fine for our case, but less than pretty :-(
> 
> anyway, hope this helps document/track it
> Ronnie
> 
> 
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> 
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