Re: Copying id
Re: Copying id
- Subject: Re: Copying id
- From: Graham Cox <email@hidden>
- Date: Tue, 12 Aug 2008 12:33:23 +1000
On 12 Aug 2008, at 12:15 pm, Mike wrote:
Both the key and value for each key in the items in my array can be
of any object type (id). The sorted key/value paid array class has
to be able to make copies of the items in the arrays when it goes to
sort them. Since the array class has to be generic to work with any
kind of key, and any kind of object, I can't know the types
beforehand. Since the array lass is generic and has to work for any
objects, I can't assume that the objects implement NSCopying.
Why not just keep an array of sorted keys? Then you can use that to
look up the item in the dictionary in the sorted order. Because
NSDictionary requires an object of type id<NSCopying> as a key value,
you can be sure that the key object supports NSCopying. Use
NSDictionary's -allKeys method to get the keys, then sort them as you
need. This is the conventional (i.e. expected) way to do this sort
(pun intended) of thing.
hth,
cheers, Graham
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