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Changes between Version 2 and Version 3 of CompositePattern

v2	v3
13	13	import std.stdio;
14	14
15		interface GraphicsOperation /* Component */ {
	15	interface IGraphicsOperation /* Component */ {
16	16	void print();
17	17	}
18	18
19		class Circle /* Leaf */ : GraphicsOperation {
	19	class Circle /* Leaf */ : IGraphicsOperation {
20	20	void print() {writefln("Circle");}
21	21	}
22	22
23		class Line /* Leaf */ : GraphicsOperation {
	23	class Line /* Leaf */ : IGraphicsOperation {
24	24	void print() {writefln("Line");}
25	25	}
26	26
27		class Drawing /* Composite */ : GraphicsOperation {
28		GraphicsOperation[] children;
	27	class Drawing /* Composite */ : IGraphicsOperation {
	28	IGraphicsOperation[] children;
29	29
30	30	void print() {
34	34	}
35	35
36		void add(GraphicsOperation c) {
	36	void add(IGraphicsOperation c) {
37	37	children~=c;
38	38	}
39	39
40		void remove(GraphicsOperation c) {
	40	void remove(IGraphicsOperation c) {
41	41	for(uint i=0; i<children.length; i++) {
42	42	if (children[i] == c) {