Re: NSMapTable with C strings as keys
Re: NSMapTable with C strings as keys
- Subject: Re: NSMapTable with C strings as keys
- From: Jens Alfke <email@hidden>
- Date: Mon, 27 May 2013 23:08:03 -0700
On May 27, 2013, at 10:46 PM, Oleg Krupnov <email@hidden> wrote:
> Now, the problem is that sometimes when I try to get a value from the
> table, the MapTableKeyComparator function is not called at all, and
> NSMapGet returns NULL, thought immediate dump of the table shows that
> all previous records are perfectly present in the table.
Probably because you haven’t implemented a hash function, only an equals function. I’m guessing NSMapTable’s default hash function merely hashes the key pointer itself, which means that if you pass it a different pointer to an equal C string, it won’t find anything.
—Jens
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden