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I have a simple class: #import <UIKit/UIKit.h> #import <CoreData/CoreData.h> @interface MyTableViewController : UITableViewController { @protected NSFetchedResultsController *_fetchedResultsController; } And one more: #import <UIKit/UIKit.h> @interface MyChildTableViewController : MyTableViewController { } - (void)someMethod; The problem is that I can't use _fetchedResultsController in MyChildTableViewController class. I get compile-time error: '_fetchedResultsController' undeclared (first use in this function)` What's wrong here? kpower ughoavgfhw posted right answer in comments. I've asked

Possible Duplicate: Protected methods in objective-c The way to declare private properties is simple. You declare that in extension that's declared in .m files. Say I want to declare protected properties and access it from the class and subclass. This is what I tried: // // BGGoogleMap+protected.h // // #import "BGGoogleMap.h" @interface BGGoogleMap () @property (strong,nonatomic) NSString * protectedHello; @end That one is compile. Then I added: #import "BGGoogleMap+protected.h" @implementation BGGoogleMap () -(NSString *) protectedHello { return _ } @end Problem starts. I can't implement

I seldom use inheritance, but when I do, I never use protected attributes because I think it breaks the encapsulation of the inherited classes. Do you use protected attributes ? what do you use them for ? In this interview on Design by Bill Venners, Joshua Bloch, the author of Effective Java says: Trusting Subclasses Bill Venners: Should I trust subclasses more intimately than non-subclasses? For example, do I make it easier for a subclass implementation to break me than I would for a non-subclass? In particular, how do you feel about protected data? Josh Bloch: To write something that is both

I created instance of base class in derived class and tried to access protected members. I can directly access protected members in a derived class without instantiating the base class. Base class: package com.core; public class MyCollection { protected Integer intg; } A derived class in the same package - package com.core; public class MyCollection3 extends MyCollection { public void test(){ MyCollection mc = new MyCollection(); mc.intg=1; // Works } } A derived class in a different package - package secondary; import com.core.MyCollection; public class MyCollection2 extends MyCollection{

How do I unit test a protected method in C++? In Java, I'd either create the test class in the same package as the class under test or create an anonymous subclass that exposes the method I need in my test class, but neither of those methods are available to me in C++. I am testing an unmanaged C++ class using NUnit. Assuming you mean a protected method of a publicly-accessible class: In the test code, define a derived class of the class under test (either directly, or from one of its derived classes). Add accessors for the protected members, or perform tests within your derived class .