Создать класс Flat

struct Flat
{
    double area; // площадь
    size_t price; // цена
};

class flat
{
private:
    double price;
    double area;
public:
    flat() : price(0), area(0) { };
    flat(const double & prc, const double & area) : price(prc), area(area) { };
    flat(const flat & date) : price(date.price), area(date.area) { };
    ~flat() { };
    flat & operator = (const flat & date);
 
    friend bool operator == (const flat & lhs, const flat & rhs);
    friend bool operator != (const flat & lhs, const flat & rhs);
 
    friend bool operator > (const flat & lhs, const flat & rhs);
    friend bool operator < (const flat & lhs, const flat & rhs);
};
 
flat & flat::operator = (const flat & date)
{
    if (this == &date)
    {
        return *this;
    }
 
    price = date.price;
    area = date.area;
    return *this;
}
 
bool operator == (const flat & lhs, const flat & rhs)
{
    return lhs.area == rhs.area;
}
 
bool operator != (const flat & lhs, const flat & rhs)
{
    return !(lhs.area == rhs.area);
}
 
bool operator > (const flat & lhs, const flat & rhs)
{
    return lhs.price > rhs.price;
}
 
bool operator < (const flat & lhs, const flat & rhs)
{
    return lhs.price < rhs.price;
}