Operator Overloading

Types of operators:

Name	Symbols
Relational	<, >, ==, !=
Unary	++, -–, !, +, -
Arithmetic	+, -, *, /, %
Logical	&&, ||, <<, >>
The 5 operators you cannot overload are:
., .*, ::, ?:, sizeOf()
In function header:

void operator<operator_symbol>();

In Implementation:

void <class_name>::operator<operator_symbol>(){
    //some code
}

Shape example:

Shape &Shape::operator=(Shape const &obj){ . . . }
bool operator<(Shape const &obj){
	if(this->length<obj.length) return true;
	else return false;
}

Non member functions or friend functions:

friend &ostream operator<<(ostream &, Shape const &);
ostream &operator<<(ostream &osObj, Shape const &obj){
	osObj<<"Insertion operator"<<endl;
    return osObj;
}