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Editorial Team
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Asked: 2026-05-14T02:45:32+00:00

In an interface such as this: @interface MyClass : NSObject { bool PlainOldBool; }

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In an interface such as this:

@interface MyClass : NSObject
{
    bool PlainOldBool;
}

@end

… does PlainOldBool get auto-initialized to false, or is it necessary to use an init method to do that explicitly?

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1 Answer

  1. Editorial Team

    Yes (unless your false is not 0). The default +alloc/+allocWithZone: method will automatically zero out all ivars.

    From https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/CocoaObjects.html#//apple_ref/doc/uid/TP40002974-CH4-SW17

    • It initializes all other instance variables to zero (or to the equivalent type for zero, such as nil, NULL, and 0.0).
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