Прегрузки - C++

#include <iostream>
 
class Bool
{
    enum value
    {
        FALSE,
        TRUE
    };
 
public:
    Bool(int bool_value = 0):
    _bool_value(bool_value == 0 ? FALSE : TRUE)
    {
    }
 
    friend Bool operator+(const Bool &, const Bool &);
    friend Bool operator*(const Bool &, const Bool &);
    friend Bool operator^(const Bool &, const Bool &);
 
    Bool operator==(const Bool &right) const
    {
        return _bool_value == right._bool_value ? Bool (1) : Bool (0);
    }
 
    Bool operator!=(const Bool &right) const
    {
        return _bool_value == right._bool_value ? Bool (0) : Bool (1);
    }
 
    friend std::ostream &operator<<(std::ostream &, const Bool &);
 
private:
    value _bool_value;
};
 
Bool operator+(const Bool &left, const Bool &right)
{
    return (left._bool_value == Bool::TRUE || right._bool_value == Bool::TRUE) ? Bool (1) : Bool (0);
}
 
Bool operator*(const Bool &left, const Bool &right)
{
    return (left._bool_value == Bool::TRUE && right._bool_value == Bool::TRUE) ? Bool (1) : Bool (0);
}
 
Bool operator^(const Bool &left, const Bool &right)
{
    return left._bool_value == right._bool_value ? Bool (0) : Bool (1);
}
 
std::ostream &operator<<(std::ostream &left, const Bool &right)
{
    return left << right._bool_value;
}
 
int main()
{
    Bool bval1(1);
    Bool bval2;
 
    std::cout << (bval1 + bval2) << std::endl;
    std::cout << (bval1 * bval2) << std::endl;
    std::cout << (bval1 ^ bval2) << std::endl;
    std::cout << (bval1 == bval2) << std::endl;
    std::cout << (bval1 != bval2) << std::endl;
 
    std::cout << (bval1 + 1) << std::endl;
    std::cout << (bval1 * 2) << std::endl;
    std::cout << (bval1 ^ 3) << std::endl;
    std::cout << (bval1 == 4) << std::endl;
    std::cout << (bval1 != 5) << std::endl;
 
    std::cout << (0 + bval2) << std::endl;
    std::cout << (0 * bval2) << std::endl;
    std::cout << (0 ^ bval2) << std::endl;
 
    return 0;
}