Re: [Discuss-gnuradio] gr.feval_dd questions

[Eric Blossom]

On Wed, Nov 22, 2006 at 05:32:57PM -0500, Marcus Leech wrote:
> I guess that there's something I don't get about how gr.feval_XX is 
> supposed to work.
> 
> I do the following
> 
> class my_thing_dd(gr.feval_dd):
>    def eval(self,x):
>        x = x
>        return(x)
> 
> ...
> ...
> ...
> 
>       my_handle = my_thing_dd()
>       ....
>       self.connect(some_block, my_handle, some_other_block)
> 
> 
> In the hopes that I could "hook in" my_thing_dd into the flow graph.   
> No such luck.
> 
> It provokes an error from within basic_block.py/coerce_endpoint:
> 
>          raise ValueError, "Not coercible to endpoint: %s" % (x,)
> 

gr.feval_* is not a subclass of gr_block, thus can't be connected to.

It's only purpose in life is to be able to have C++ evaluate Python
code without knowing what it's doing ;)

Eric