Nominal.h

#ifndef __NOMINAL_H__
#define __NOMINAL_H__

template<class UnitType, class RepType>
    class Nominal
{
public:
    Nominal(RepType v) : value_(v) {}
	
	bool operator==(const Nominal<UnitType, RepType>& v) const
	{ return value_ == v.value_; }
	
	bool operator!=(const Nominal<UnitType, RepType>& v) const
	{ return value_ != v.value_; }
	
	const Nominal<UnitType, RepType>& operator=(const Nominal<UnitType,
						    RepType>& v)
	{ value_ = v.value_; return *this; }
	
	RepType value() const
	{ return value_; }
	
protected:
	RepType value_;
};

template<class UnitType, class RepType>
    class Ordinal : public Nominal<UnitType, RepType>
{
public:
    Ordinal(RepType v) : Nominal<UnitType, RepType>(v) {}
	
	bool operator<(const Ordinal<UnitType, RepType>& v) const
	{ return Nominal<UnitType, RepType>::value_ < v.value_; }
	
	bool operator<=(const Ordinal<UnitType, RepType>& v) const
	{ return Nominal<UnitType, RepType>::value_ <= v.value_; }
	
	bool operator>(const Ordinal<UnitType, RepType>& v) const
	{ return Nominal<UnitType, RepType>::value_ > v.value_; }

	bool operator>=(const Ordinal<UnitType, RepType>& v) const
	{ return Nominal<UnitType, RepType>::value_ >= v.value_; }
	
	Ordinal<UnitType, RepType> operator+(const Ordinal<UnitType,
					     RepType>& other)
	{ return (Nominal<UnitType, RepType>::value_ + other.value_); }
	
	Ordinal<UnitType, RepType> operator/(const Ordinal<UnitType,
					     RepType>& other)
	{ return (Nominal<UnitType, RepType>::value_ / other.value_); }
	
	const Ordinal<UnitType, RepType>& operator++()
	{ ++Nominal<UnitType, RepType>::value_; return *this; }
};

#endif // __NOMINAL_H__