New subject: [BrlCV] My attempt of linking Linux to Eurorack

28 Jul 2017

...
  Mario Lang:

...
  #include <jack.hpp>

 #include <boost/accumulators/accumulators.hpp>
 #include <boost/accumulators/statistics.hpp>

 template<typename... Features>
 using AudioAccumulatorSet = boost::accumulators::accumulator_set<
   float, boost::accumulators::features<Features...>
 ; 
 using Count = boost::accumulators::tag::count;
 using Max = boost::accumulators::tag::max;
 using Min = boost::accumulators::tag::min;
 using Mean = boost::accumulators::tag::mean;
 using Variance = boost::accumulators::tag::variance;

 class Statistics final : public JACK::Client {
   JACK::AudioIn In;
   AudioAccumulatorSet<Count, Max, Mean, Min, Variance> Accumulator;

 public:
   Statistics() : JACK::Client("Statistics"), In(createAudioIn("In"))
{}
   int process(std::uint32_t FrameCount) override {
     for (auto &Value: In.buffer(FrameCount)) Accumulator(Value);
     return 0;
   }
   auto max() const { return boost::accumulators::max(Accumulator); }
   auto mean() const { return boost::accumulators::mean(Accumulator); }
   auto min() const { return boost::accumulators::min(Accumulator); }
   auto sampleCount() const { return boost::accumulators::count(Accumulator);
 }
   auto variance() const { return boost::accumulators::variance(Accumulator);
 }
 };

 Nice code. But I wonder about one small thing related to C++.
Couldn't these max/mean/etc. methods in the Statististics class
be written shorter like this?:

  auto max() const { return Max(Accumulator); }
  auto mean() const { return Mean(Accumulator); }
  auto min() const { return Min(Accumulator); }
  auto sampleCount() const { return Count(Accumulator); }
  auto variance() const { return Variance(Accumulator); }

Sorry if it's a stupid question, but I haven't used "using" in C++ yet.
:-)

Also thanks for demonstrating these things from boost.

Re: [LAD] [BrlCV] My attempt of linking Linux to Eurorack