units.h

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#ifndef CHEMMISOL_UNIT_H
#define CHEMMISOL_UNIT_H
 
#include <unordered_map>
#include <string>
 
#define UNITS(F)\
    F(m, 1, LENGTH)\
    F(cm, 1e-2*m, LENGTH)\
    F(nm, 1e-9*m, LENGTH)\
    F(nm2, nm*nm, SURFACE)\
    F(m2, m*m, SURFACE)\
    F(l, 1, VOLUME)\
    F(m3, 1000*l, VOLUME)\
    F(cm3, 10e-3*l, VOLUME)\
    F(g, 1, MASS)\
    F(gram, 1, MASS)\
    F(kg, 1e3*gram, MASS)\
    F(mg, 1e-3*gram, MASS)\
    F(mol, 1, QUANTITY)\
    F(entities, 1/NA, QUANTITY)\
    F(u, 1.66053906660e-27*kg, MASS)
 
#define UNIT_DEF(NAME, VALUE, CATEGORY) extern const double NAME;
 
#define UNIT_VALUE(NAME, VALUE, CATEGORY) const double NAME = VALUE;
 
#define UNIT_NAME_TO_CATEGORY(NAME, VALUE, CATEGORY) {#NAME, Category::CATEGORY},
 
namespace chemmisol {
    extern const double NA;
 
    enum Category {
        MASS, LENGTH, VOLUME, SURFACE, QUANTITY
    };
 
    UNITS(UNIT_DEF)
    static const std::unordered_map<std::string, Category> units_category {
        UNITS(UNIT_NAME_TO_CATEGORY)
    };
}
#endif