GNU Radio, One Step at a Time: [Discuss-gnuradio] Question about inputs and outputs of a block

Hi all,

I'd like to know if it's possible to create a block with two inputs (or two
outputs) having different sizes.
For example, a block that takes a vector of N numbers on one of its two inputs
and a stream (a vector which has only one element) on the other input.
I already tried to create a block with these characteristics, but I failed.
Please tell me if this is possible.

Best Regards,