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POQuestion about class members in Objective-C
 

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  1. POQuestion about class members in Objective-C
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    <p>I have seen the following style of defining class members; however, I have only seen it done for objects. I'm having difficulty figuring out if it will work for structures (i.e. NSUInteger or enum) and primitives (i.e. int, uint, float) as well.</p> <p>Here is my aClass.h</p> <pre><code>typedef enum { kValue0 = 0, kValue1 } CustomType; @interface aClass : CCLayerColor { NSUInteger _aMember; CustomType _anotherMember; float _aThirdMember; NSString _aFourthMember; } @property (assign) NSUInteger aMember; @property (assign) NSUInteger anotherMember; @property (assign) NSUInteger aThirdMember; @property (nonatomic, retain) NSString aFourthMember; @end </code></pre> <p>And here is my aClass.m</p> <pre><code>@implementation aClass @synthesize aMember = _aMember; @synthesize anotherMember = _anotherMember; @synthesize aThirdMember = _aThirdMember; @synthesize aFourthMember = _aFourthMember; - (id)init { if( (self=[super init] )) { NSUInteger _aMember = 100; CustomType _anotherMember = kValue0; float _aThirdMember = 200.0f; NSString _aFourthMember = [[NSString alloc] init]; } return self; } </code></pre> <p>In testing, I find that if I call the synthesized helper functions (get/set), I am able to access the member via _aMember or aMember equally well. I don't understand why, though? It seems that '@synthesize aMember = _aMember;' would only work as intended with objects, where both aMember and _aMember would point to the same memory location. I suppose I just don't understand what's happening here.</p> <p>Can anyone tell me why this works?</p> <p>Thanks, Jonathan</p>
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