TITLE: Overloading operator , ?


PROBLEM: matt@physics2.berkeley.edu (Matt Austern)

Incidentally, can anyone suggest to me any good reason why operator,
is overloadable?  Is there ever any sensible reason to overload
operator,?


RESPONSE: p j l @graceland.att.com (Paul J. Lucas), 14 Nov 94

Yes:

	template<class T> class Set {
	public:
		// ...
		Set<T>& operator= ( T const& );
		Set<T>& operator+=( T const& );
		Set<T>& operator, ( T const &t ) {
			return operator+=( t );
		}
	};

	Set<int> s;
	// ...
	s = 1, 2, 3, 5, 7;
	s += 11, 13;

Overloading operator,() is a type-safe "...".  Overloading =,
+= and comma as a trio is very handy.  Operator comma gets the
associativity correct.