10.5 Increment and decrement operators

自增 自检的运算符重载

Increment

Two operators: prefix increment & postfix increment

// prefix increment
MyTime& operator++()
{
    this->minutes++;
    this->hours += this->minutes / 60;
    this->minutes = this->minutes % 60;
    return *this; 
}
// postfix increment
MyTime operator++(int)
{
    MyTime old = *this; // keep the old value
    operator++(); // prefix increment
    return old; 
}

C++中可以重载的运算符