Initial data commit

Task/Polymorphic-copy/Objective-C/polymorphic-copy.m

@@ -0,0 +1,38 @@
+@interface T : NSObject
+- (void)identify;
+@end
+
+@implementation T
+- (void)identify {
+    NSLog(@"I am a genuine T");
+}
+- (id)copyWithZone:(NSZone *)zone {
+    T *copy = [[[self class] allocWithZone:zone] init]; // call an appropriate constructor here
+                                                        // then copy data into it as appropriate here
+                                                        // make sure to use "[[self class] alloc..." and
+                                                        // not "[T alloc..." to make it polymorphic
+    return copy;
+}
+@end
+
+@interface S : T
+@end
+
+@implementation S
+- (void)identify
+{
+    NSLog(@"I am an S");
+}
+@end
+
+int main()
+{
+    @autoreleasepool {
+
+        T *original = [[S alloc] init];
+        T *another = [original copy];
+        [another identify]; // logs "I am an S"
+
+    }
+    return 0;
+}