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// This goes in the header that users of your framework/static lib can use:

@interface MyPublicClass : NSObject
{
    struct MyPublicClassIVars    *ivars;
}

@property (assign) int myInt;

@end


// ----------
// This goes in the implementation file that gets compiled into the library and thus never gets seen by clients:

struct MyPublicClassIVars
{
    int myInt;
};


@implementation MyPublicClass

-(id)    init
{
    if(( self = [super init] ))
    {
        ivars = calloc( 1, sizeof(struct MyPublicClassIVars) );
    }
    return self;
}


-(void)    dealloc
{
    free( ivars );
    [super dealloc];
}


-(void)    setMyInt: (int)theInt
{
    ivars->myInt = theInt;
}


-(int)    myInt
{
    return ivars->myInt;
}

@end