units.h

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#pragma once
#ifndef SYDEVS_UNITS_H_
#define SYDEVS_UNITS_H_

#include <sydevs/core/scale.h>

namespace sydevs {


template<int64 g, int64 m, int64 s, int64 A, int64 K, int64 mol, int64 cd>
struct units
{
    constexpr units() = default;  

    enum {
        g_ = g,      
        m_ = m,      
        s_ = s,      
        A_ = A,      
        K_ = K,      
        mol_ = mol,  
        cd_ = cd,    
    };

    template<int64 g_, int64 m_, int64 s_, int64 A_, int64 K_, int64 mol_, int64 cd_>
    constexpr units<g + g_, m + m_, s + s_, A + A_, K + K_, mol + mol_, cd + cd_> operator*(units<g_, m_, s_, A_, K_, mol_, cd_> rhs) const
    {
        return units<g + g_, m + m_, s + s_, A + A_, K + K_, mol + mol_, cd + cd_>();
    }

    template<int64 g_, int64 m_, int64 s_, int64 A_, int64 K_, int64 mol_, int64 cd_>
    constexpr units<g - g_, m - m_, s - s_, A - A_, K - K_, mol - mol_, cd - cd_> operator/(units<g_, m_, s_, A_, K_, mol_, cd_> rhs) const
    {
        return units<g - g_, m - m_, s - s_, A - A_, K - K_, mol - mol_, cd - cd_>();
    }
};


using no_units = units<0, 0, 0, 0, 0, 0, 0>;
using grams = units<1, 0, 0, 0, 0, 0, 0>;
using meters = units<0, 1, 0, 0, 0, 0, 0>;
using seconds = units<0, 0, 1, 0, 0, 0, 0>;
using amperes = units<0, 0, 0, 1, 0, 0, 0>;
using kelvins = units<0, 0, 0, 0, 1, 0, 0>;
using moles = units<0, 0, 0, 0, 0, 1, 0>;
using candelas = units<0, 0, 0, 0, 0, 0, 1>;


constexpr auto _1 = no_units();
constexpr auto _g = grams();
constexpr auto _m = meters();
constexpr auto _s = seconds();
constexpr auto _A = amperes();
constexpr auto _K = kelvins();
constexpr auto _mol = moles();
constexpr auto _cd = candelas();


}  // namespace

#endif