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Tip of the Day
Language: C++
Expertise: All
Jul 1, 1998

Consistent operator overloading

Whenever you overload operators such as + or -, it is useful to support the corresponding += and -= as well. As opposed to a common belief, the compiler will not do that for you automatically:
 
class Date 
{
//...Date stuff
	public:
		Date& operator + (const Date& d);  //note: operator += not defined
	};

Date d1, d2;
d1 = d1 + d2; //fine; uses overloaded + and default assignment operator
d1 += d2; //compile time error: 'no user defined operator += for class Date'
Danny Kalev
 
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