LengthUnit.h

 
#ifndef ACTIVE_MEASURE_LENGTH_UNIT
#define ACTIVE_MEASURE_LENGTH_UNIT
 
#include "Active/Setting/Values/Measurement/Units/Unit.h"
 
namespace active::measure {
    
    // MARK: - Types
    
    enum class LengthType : char {
        millimetre,
        centimetre,
        metre,
        kilometre,
        inch,
        foot,
        yard,
        mile,
    };
    
    // MARK: - Constructors
    
    struct LengthUnit : public Unit<LengthUnit, LengthType> {
        
        using Type = LengthType;
        
        using enum LengthType;
 
        // MARK: - Static functions
        
            //Get unit for millimetres
        static LengthUnit millimetres(uint8_t prec = 1, bool suffixes = true) { return LengthUnit{millimetre, prec, true, suffixes}; }
            //Get unit for centimetres
        static LengthUnit centimetres(uint8_t prec = 2, bool suffixes = true) { return LengthUnit{centimetre, prec, true, suffixes}; }
            //Get unit for metres
        static LengthUnit metres(uint8_t prec = 4, bool suffixes = true) { return LengthUnit{metre, prec, true, suffixes}; }
            //Get unit for decimal inches
        static LengthUnit decimalInches(uint8_t prec = 3, bool suffixes = true) { return LengthUnit{inch, prec, true, suffixes}; }
            //Get unit for decimal feet
        static LengthUnit decimalFeet(uint8_t prec = 4, bool suffixes = true) { return LengthUnit{foot, prec, true, suffixes}; }
            //Get unit for feet & decimal inches
        static LengthUnit feetDecInches(uint8_t prec = 3) { return LengthUnit{foot, inch, prec, true}; }
            //Get unit for feet & fractional inches
        static LengthUnit feetFracInches(uint8_t prec = 6) { return LengthUnit{foot, inch, prec, false}; }
        
        // MARK: - Constructors
    
        LengthUnit() : Unit{metre} {}   //Default to metres - can be overridden as required
        LengthUnit(LengthType type, uint8_t prec, bool isDecimal = true, bool suffixes = true) :
                Unit{type, prec, isDecimal, suffixes} {}
        LengthUnit(LengthType first, LengthType second, uint8_t prec, bool isDecimal = true) :
                Unit{first, second, prec, isDecimal} {}
 
    private:
#ifdef WINDOWS
        friend typename Unit;
#else
        friend struct Unit;
#endif
        
        // MARK: Unit constants
 
        constexpr static int lengthCount = static_cast<int>(mile) + 1;
 
        static std::array<const char*, lengthCount> tags;
        static std::array<const char*, lengthCount> abbreviations;
        static std::array<double, lengthCount> conversions;
        static std::array<bool, lengthCount> metric;
    };
    
}
    
#endif //ACTIVE_MEASURE_LENGTH_UNIT