OpenRCT2-Rotation-object.h

struct Rotation
{
    const uint8 & Value() const
    {
        Guard::Assert(_rotation == (_rotation & 3));
        return _rotation;
    }

    Rotation & operator=(Rotation rhs)
    {
        _rotation = rhs._rotation;
        return *this;
    }

    Rotation & operator+=(const Rotation & rhs)
    {
        _rotation = (_rotation + rhs._rotation) & 3;
        return *this;
    }

    Rotation & operator-=(const Rotation & rhs)
    {
        _rotation = (_rotation - rhs._rotation) & 3;
        return *this;
    }

    Rotation & operator++()
    {
        _rotation = (_rotation + 1) & 3;
        return *this;
    }

    Rotation operator++(int)
    {
        Rotation tmp(*this);
        operator++();
        return tmp;
    }

private:
    uint8 _rotation;
};

inline Rotation operator+(Rotation lhs, const Rotation & rhs)
{
    lhs += rhs;
    return lhs;
}
inline Rotation operator-(Rotation lhs, const Rotation & rhs)
{
    lhs += rhs;
    return lhs;
}
inline bool operator==(const Rotation & lhs, const Rotation & rhs)
{
    return lhs.Value() == rhs.Value();
}
inline bool operator!=(const Rotation & lhs, const Rotation & rhs)
{
    return !operator==(lhs, rhs);
}