#include <iostream>
#include <sstream>
#include <string>

using milliDag = unsigned int;

class Time
{
public:
    Time(milliDag milliDags) : milliDags{milliDags} {}
    Time() : milliDags{0} {}

    Time& operator++()
    {
	if ( milliDags == 999)
	{
	    milliDags = 0;
	}
	else
	{
	    ++milliDags;
	}
	return *this;
    }

    Time operator++(int)
    {
	Time old{*this};
	++*this;
	return old;
    }

    Time operator+(uint rhs) const
    {
	Time newtime{milliDags + rhs};
	if (newtime.milliDags > 999)
	{
	    newtime.milliDags = newtime.milliDags % 1000;
	}
	return newtime;
    }


    std::string to_string() const
    {
	std::stringstream sstream{};
	sstream << milliDags;
	return sstream.str();
    }
    
private:
    milliDag milliDags;
};

std::ostream& operator<<(std::ostream& os, Time const& rhs)
{
    os << rhs.to_string();
    return os;
}

Time operator+(uint lhs, Time const& rhs)
{
    return rhs + lhs;
}

int main()
{
    std::cout << "Testing increment" << std::endl;
    Time time1{};
    ++(++time1);
    std::cout << time1++ << std::endl;
    std::cout << time1 << std::endl;

    Time time2{999};
    std::cout << time2++ << std::endl;
    std::cout << time2 << std::endl;

    std::cout << "\nTesting binary addition operators:" << std::endl;
    Time const time3{};
    std::cout << time3 + 999 << std::endl;
    std::cout << time3 + 1000 << std::endl;
    std::cout << time3 + 3500 << std::endl;

    Time const time4{};
    std::cout << 999 + time4 << std::endl;
    std::cout << 1000 + time4 << std::endl;
    std::cout << 3500 + time4 << std::endl;
}