units.h

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#ifndef CHEMISTRY_UNITS_H
#define CHEMISTRY_UNITS_H
 
#include <array>
#include <string>
 
#include <yaml-cpp/yaml.h>
 
namespace chemistry {
 
struct Dimension {
    double mass = 0.0;
    double length = 0.0;
    double time = 0.0;
    double temperature = 0.0;
    double quantity = 0.0;
    double energy = 0.0;
    double pressure = 0.0;
};
 
class UnitSystem {
    public:
        UnitSystem() = default;
 
        explicit UnitSystem(const YAML::Node & units);
 
        double convert(const YAML::Node & value, const Dimension & dimension, const std::string & what) const;
 
        double convert_activation_energy(const YAML::Node & value, const std::string & what) const;
 
    private:
        // SI factors of the default units, in the order of Dimension
        std::array<double, 7> defaults = {1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0};
        std::string activation_energy_units = "J/kmol";
};
 
} // namespace chemistry
 
#endif // CHEMISTRY_UNITS_H