c++ operator override

std::ostream& operator << (std::ostream& out,  Box& B){
    out << B.getLength() << " " << B.getBreadth() << " " << B.getHeight();
    return out;
}

this is “«” overload. Note it will be defined at beside of class.

bool operator < (const Box& B){ // overload operator "<"
       if (this->l < B.l)
           return true;
       else if (this->l == B.l && this->b < B.b)
           return true;
       else if (this->l == B.l && this->b == B.b && this->h < B.h)
           return true;
       else
           return false;
};

This is <’s override,which is defined in class,Why it is different from above example.Yes, the reason that is we can use keyword this pointer to access private numbers of class.

c++ operator override

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