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copied!<p>From the docs: <a href="https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/DefiningClasses/DefiningClasses.html" rel="nofollow">Apple Objective-C Programming Language</a> <em>(doesn't mention this anymore, but you can find it in <a href="https://developer.apple.com/legacy/library/documentation/Cocoa/Conceptual/ObjectiveC/ObjC.pdf" rel="nofollow">this retired document</a>)</em>.</p> <blockquote> <p>The instance variable is accessible within the class that declares it and within classes that inherit it. All instance variables without an explicit scope directive have <code>@protected</code> scope.</p> <p>However, a public instance variable can be accessed anywhere as if it were a field in a C structure. For example:</p> <p><code>Worker *ceo = [[Worker alloc] init];</code></p> <p><code>ceo->boss = nil;</code></p> </blockquote> <p>I have the compilation error using <code>LLVM GCC 4.2</code> (for an iOS project, on device):</p> <blockquote> <p>error: 'fooInstanceVar' undeclared (first use in this function) and the same one using GCC 4.2 : error: 'fooInstanceVar' undeclared (first use in this function)</p> </blockquote> <p>I can compile using <code>LLVM Compiler 2.0</code> whithout error.</p> <p>For compiling with <code>LLVM GCC 4.2</code> and <code>GCC 4.2</code> with the use of <code>self-></code>:</p> <blockquote> <p><code>[NSArray arrayWithObjects:self.barProperty, self->fooInstanceVar, nil];</code> in the <code>doSomethingWithProperty</code> method.</p> </blockquote>

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