[boost] [Accumulators]multiple statistic instances

From: Hugo Duncan (hugoduncan_at_[hidden])
Date: 2007-08-02 09:38:46

I am trying to create an IIR filter (see e.g.,  
http://en.wikipedia.org/wiki/IIR) using the delay buffer implementation  
recently discussed.

To do this I need two delay buffers for my filter, one for the samples and  
one for the computed outputs.

I have tried templating my delay buffer with a discrimating type, but I  
can't get more than one buffer instantiated.  ie the following creates  
only one buffer instantation.

     accumulator_set<int, stats<
          tag::delay<>,
          tag::delay<my_other_delay> > > acc(
       tag::delay<>::cache_size = 3,
       tag::delay<my_other_delay>::cache_size = 4
     );

Is this worth perservering with? any hints? or would it be better to wait  
for the next version of accumulators?