langs a-z

Task/Inheritance-Multiple/Objective-C/inheritance-multiple.m

@@ -0,0 +1,53 @@
+@interface Camera : NSObject {
+}
+@end
+
+@implementation Camera
+@end
+
+@interface MobilePhone : NSObject {
+}
+@end
+
+@implementation MobilePhone
+@end
+
+@interface CameraPhone : NSObject {
+  Camera *camera;
+  MobilePhone *phone;
+}
+@end
+
+@implementation CameraPhone
+
+-(id)init {
+  if ((self = [super init])) {
+    camera = [[Camera alloc] init];
+    phone = [[MobilePhone alloc] init];
+  }
+  return self;
+}
+
+-(void)dealloc {
+  [camera release];
+  [phone release];
+  [super dealloc];
+}
+
+-(void)forwardInvocation:(NSInvocation *)anInvocation {
+  SEL aSelector = [anInvocation selector];
+  if ([camera respondsToSelector:aSelector])
+    [anInvocation invokeWithTarget:camera];
+  else if ([phone respondsToSelector:aSelector])
+    [anInvocation invokeWithTarget:phone];
+  else
+    [self doesNotRecognizeSelector:aSelector];
+}
+
+-(BOOL)respondsToSelector:(SEL)aSelector {
+  return [camera respondsToSelector:aSelector]
+  || [phone respondsToSelector:aSelector]
+  || [super respondsToSelector:aSelector];
+}
+
+@end