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    <p>It isn't.</p> <p>An object cannot be out of scope, because objects do not have scope. What they can be is unreachable, which is what happens when you don't have any variables holding the object's pointer.</p> <p>Variables can be out of scope. You can only use a variable within the same scope in which you declared it; you can't begin a compound statement, declare a variable, finish the compound statement, and use the variable, and you can't declare a variable in one function or method and then use it in a different one.</p> <p>You said in <a href="https://stackoverflow.com/questions/4177877/posible-reason-of-instance-out-of-scope">your other question</a> that it's the debugger telling you the variable is out of scope. This means one of <del>two</del> three things:</p> <ol> <li>The variable really is out of scope. Move the variable or move the code that uses it, or just interrupt the debugger earlier (with a breakpoint, if necessary).</li> <li>The debugger is just being stupid. This happens a lot. Try the <code>po</code> command or sprinkle your code with <code>NSLog</code> statements instead.</li> <li>You're trying to examine a property-access expression. A property-access expression, by definition, must send an accessor message, which may have side effects; for that reason, the debugger won't do that just for you hovering over the expression, because that's too easy to do by accident. You must use the <code>po</code> command in the Debugger Console to send the accessor message and print the description of the result.</li> </ol>
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    1. POWhy my array instance is out of scope?
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    1. USPeter Hosey
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    1. COThanks, I will check the code according to your comments. The strange thing is the Paper instance is valid pointer but the paper.items is out of scope. I guess the variable pointer is released or somehow became invalid. As you said, the code I pasted here are not beautiful, but since you guys did not point what's wrong in the code, at least I know the errors are in other part of our code. I will update the thread when I found sth. Thank you guys again.
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    2. CO@icespace: `paper.items` is out of scope because it's a property-access expression. Retrieving it would cause an accessor message, which, because accessors can have side effects, the debugger will not do without your explicit command. Hovering over the expression is not explicit enough; you must inspect it using the `po` command.
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    3. CO(And yes, that's a very loose application of “out of scope”. The debugger really should say something different for property access expressions, as long as the variable at the root of the expression is in scope.)
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