Hello all,

I was building my own block in C++ and I have one doubt about it. Some times my 
block has to work with float streams and sometimes with complex streams. There 
is one single input and output.
I have implemented separately: sync_ff_impl.cc and sync_cc_impl.cc each one 
with its respective xml file to use it in gnuradio-companion. Now I wanted to 
have only one xml so that the block is type-selectable. Is there any template 
or way to make it? I have been checking the code from other type-selectable 
blocks but it did not help much.

If there is some interest about what the block does, it basically adds a 
predefined preamble to the incoming packets, so that in reception the receiver 
is able to know when the packet starts.

Thanks before hand.
Best regards,

Gabriele Galiero
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