meter.h

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#ifndef CPPAPE_METER_H
#define CPPAPE_METER_H
 
#include "baselib.h"
#include <string>
#include <cmath>
 
namespace ape
{
    class MeteredValue : public UIObject
    {
    public:
        MeteredValue(std::string name)
            : peak(), value(), peakTimer() /* , name(std::move(name)) */
        {
            id = getInterface().createMeter(&getInterface(), name.c_str(), &value, &peak);
 
            auto sampleRate = getInterface().getSampleRate(&getInterface());
            pole = std::exp(-1.0 / (0.25 * sampleRate));
            peakStop = static_cast<std::size_t>(sampleRate);
        }
 
        ~MeteredValue()
        {
            getInterface().destroyResource(&getInterface(), id, 0);
        }
 
        template<typename T>
        T operator = (T input) noexcept
        {
            pushValue(static_cast<double>(input));
            return input;
        }
 
        void pushValue(double input) noexcept
        {
            input = std::abs(input);
            if (input <= value)
            {
                value *= pole;
            }
            else
            {
                value = input;
            }
 
            if (input <= peak)
            {
                if (peakTimer > peakStop)
                {
                    peak *= pole;
                }
                else
                {
                    peakTimer++;
                }
            }
            else
            {
                peak = input;
                peakTimer = 0;
            }
        }
 
    private:
 
        double peak, value, pole;
        int id;
        std::size_t peakTimer, peakStop;
 
        //std::string name;
    };
 
}
#endif