BagMethod.h

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#pragma once
 
#include <cmath>
#include <functional>
#include <stdexcept>
#include <vector>
 
class BagMethod {
  public:
    struct Output {
        Output(const double flowRate, const double annualConsumption)
            : flowRate(flowRate), annualConsumption(annualConsumption) {}
 
        const double flowRate, annualConsumption;
    };
 
    BagMethod(double operatingTime, double bagFillTime, double bagVolume, int numberOfUnits)
        : operatingTime(operatingTime), bagFillTime(bagFillTime), bagVolume(bagVolume), numberOfUnits(numberOfUnits) {}
 
    Output calculate() {
        auto const flowRate = bagVolume / (bagFillTime / 60);
        return {flowRate, (flowRate * operatingTime * numberOfUnits * 60) / 1000};
    }
 
  private:
    double operatingTime, bagFillTime, bagVolume, numberOfUnits;
};