On 29 Mar '08, at 10:11 AM, Davide Benini wrote:
I half suspected something like this...
Well, for a _pointer_ type*, there is an "empty" value: NULL. (For object pointers the constant 'nil' is used, but they both have the same underlying value.)
When an Objective-C object is created, its storage is filled with zeroes. So instance variables that you haven't assigned a value to yet are guaranteed to be NULL, or nil, or zero. (In other words, Objective- C's 'alloc' calls 'calloc', not 'malloc'.)
But watch out — this doesn't apply to local variables in functions or methods. Those have random/garbage values until initialized. Same goes for raw memory allocated via 'malloc' — use 'calloc' if you want it zeroed.
—Jens* It sounds like you're coming from a PHP background ... if you haven't done much C programming before, the distinction between pointers and scalars is likely to be confusing, since it doesn't exist in higher-level languages. If so, definitely find a good C textbook and read through that first!
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