Objective-C code:

@interface Foo: NSObject {
    struct Element *array;
    int arraySize;
}

@end

@implementation Foo

-(id) init
{
    int newArraySize = [[NSUserDefaults standardUserDefaults] integerForKey:"arraySize"];
    struct Element *newArray = calloc(arraySize, sizeof(struct Element));
    
    if (!newArray) {
        [self dealloc];
        return nil;
    }
    
    self = [super init];

    if (self != nil) {
        array = newArray;
        arraySize = newArraySize;
    }

    return self;
}

@end