Vivrefs 2

class Thingy{
   private:
      std::vector<int> stuff;   // stuff
public:
		Thingy(){
			stuff = {1,2,3};
		}
		std::vector<int> getStuff(){
			return stuff;
		}
		std::vector<int>& getStuffRef(){
			return stuff;
		}
		void printstuff(){
			for (int i = 0; i < stuff.size(); ++i){
				printf("%d, ", stuff[i]);
			}
			printf("\n");
		}
};

// actual code
Thingy thing = Thingy();
std::vector<int> theStuff = thing.getStuff();
theStuff.append(4);
thing.printstuff();
/* this will print
1, 2, 3,
because we got a copy of the vector, not a reference, so the original wasn't changed by our append */

theStuff = thing.getStuffRef();
theStuff.append(4);
thing.printstuff();
/* this will print
1, 2, 3, 4,
because we got a reference to the vector in the object, so the original WAS changed by our append */