CONCEPT
	references

DESCRIPTION
	Call by reference can be used to have a function that passes
	more than one value to the caller, without using arrays that
	have to be unpacked thereinafter.
	There is nothing special to declare in the calling function,
	you simply do an assignment to a parameter of the function.
	The caller has to pass references explicitely; this is done by
	prefixing an lvalue with '&' .
	To pass a reference to an element of an array, you have to
	enclose the indexed lvalue in round brackets.

EXAMPLE

	void assign(mixed destination, mixed source) {
	    destination = source;
	}

	void extract_number(int destination, string source) {
	    sscanf(source, "%d", destination);
	}

	void test() {
	    int i;
	    float f;
	    mixed *a;

	    extract_number(&i, "42 palantirs");
	    assign(&f, 3.141592653589793);
	    assign(&a, ({ i, f }));
	    assign(&(a[<0..<1]), ({1,2,3,"sink","x","y","x"}));
	    assign(&(a[5][0]), 'w');
	    assign(&(a[5][<1]), 'g');
	    printf("%O", a));
	}

	({ /* sizeof() == 9 */
	  42,
	  3.14159,
	  1,
	  2,
	  3,
	  "wing",
	  "x",
	  "y",
	  "x"
	})