Curiosity about implementation of block with multiple data type

GNU Radio
1

Looking better about implementation of blocks like fft,fir,etc a
question
rise in my brain.
Why in blocks with selectable input/output data type there are C++
multiple
file, each one with the specialization of a single data type(file
finishing
with _cc,_ff,etc), instead of use template(and eventually explicit
specialization where is necessary)?

I’m not an expert,so I’d like to understand why you have chosen an
approach
instead of another.

Thanks,
marco

2

On Thu, Apr 30, 2015 at 9:30 AM, marco Ribero
[email protected]
wrote:

Thanks,
marco

We don’t use templates because we do a lot of low-level math, especially
with the use of VOLK, that’s very type-specific. You couldn’t call
volk_32fc_x2_dot_prod_32fc in a templated FIR filter class without
specializing the template for complex inputs and taps. By the time we’re
done, we’ve ended up specializing every data type so there’s no point in
using templates at all.

Now pre-VOLK, the reason was because SWIG was terrible about supporting
templated classes and functions, so Eric invented his own version. But
because we’re more worried about speed, we’ve not bother to re-architect
things with templates with the expectation that we’d just be
specializing
everything, anyways.

Tom

3

Ok I’ve understood. Thank you for your answer.

Have a good day,
Marco

Il giorno gio 30 apr 2015 16:47 Tom R. [email protected] ha
scritto: