Re: Converting from scalar to NSNumber*
Re: Converting from scalar to NSNumber*
- Subject: Re: Converting from scalar to NSNumber*
- From: Sean McBride <email@hidden>
- Date: Fri, 27 Feb 2015 22:58:32 -0500
- Organization: Rogue Research Inc.
On Fri, 27 Feb 2015 16:28:58 -0800, Rick Mann said:
>I'm updating some older Core Data code in which I made liberal use of
>transient properties to map NSNumber* types to scalar types like
>uint32_t. In practice, this doesn't gain much, especially with boxing
>syntax, and it makes the Core Data classes messier (shadow attributes, etc.).
>
>The problem is, if I change an attribute's type to NSNumber*, and fail
>to modify every reference to that attribute, I often end up comparing
>pointers, not values:
>
> @property (strong) NSNumber* someAttribute;
>
> if (obj.someAttribute > 42)
Also watch out for booleans, where:
if (obj.someAttribute)
won't get any warning, whether it's BOOL or id.
Also if you use mogenerator, it will automatically create methods for you named setSomeAttributeValue: and someAttributeValue, which take scalars.
Cheers,
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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