Re: NSValue valueWithBytes:objCType:
Re: NSValue valueWithBytes:objCType:
- Subject: Re: NSValue valueWithBytes:objCType:
- From: Marcel Weiher <email@hidden>
- Date: Sun, 25 Aug 2013 17:52:09 +0200
On Aug 24, 2013, at 22:09 , Andreas Grosam <email@hidden> wrote:
> What's the purpose of NSValue's class method
>
> + (NSValue *)valueWithBytes:(const void *)value objCType:(const char *)type; ?
>
> It seems, NSValue will simply memcpy the content of value, and "somehow" determine the size in bytes from the string given in type. Is that reliable at all? (I have major doubts).
I have to admit I have a hard time fathoming the purpose of NSValue, and personally I’ve only every used it “in anger” once. As far as I can tell, it is a backstop when you need to store some random C type in an NSArray and do not need semantics, but do want to keep track of the actual type. I use it when my bridge code punts: I can’t use the value on the “scripting” side of the bridge, but I can replay it successfully if it’s needed in another call.
If you need semantics, do not use NSValue, use an actual Objective-C class, either by re-creating that struct as an object or wrapping it explicitly.
Cheers,
Marcel
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