How to define dimension class

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"Fear of a C++ only increases fear of the thing itself."

dimension type

All that is required to behave as a dimension type is to define a void type alias named is_base_dimension as a type member.

struct wizarding_currency {
    using is_base_dimension = void;
};

Base unit type

Use mitama::make_unit_t to get base unit types from dimension types.

using knut_t = mitama::make_unit_t<wizarding_currency>;

Scaled unit type

Use mtiama::make_unit_t to get scaled unit types from base unit types.

using sickle_t = mitama::scaled_unit_t<knut_t, std::ratio<29>>;
using galleon_t = mitama::scaled_unit_t<sickle_t, std::ratio<17>>;

Dimensional quantifiers [option]

inline constexpr knut_t knuts{};
inline constexpr knut_t knut{};

inline constexpr sickle_t sickles{};
inline constexpr sickle_t sickle{};

inline constexpr galleon_t galleons{};
inline constexpr galleon_t galleon{};

Format [option]

Define specializations to enable formatted output.

namespace mitama {
    template <> struct abbreviation<wizarding::knut_t>
        { static constexpr char str[] = "knuts"; };
    template <> struct abbreviation<wizarding::sickle_t>
        { static constexpr char str[] = "sickles"; };
    template <> struct abbreviation<wizarding::galleon_t>
        { static constexpr char str[] = "galleons"; };
}