Le 21 juil. 2011 à 00:30, Jens Alfke a écrit : > > On Jul 20, 2011, at 2:34 PM, Andreas Grosam wrote: > >> According the doc, the parameter "capacity" in function >> CFDictionaryCreateMutable() sets the *maximum number* of key-value pairs >> which can be inserted into the container. That is, it's not an *initial* >> capacity. > > I think that was a mistake in the docs. The comment in CFDictionary.h in the > 10.7 SDK says: > > @param capacity A hint about the number of values that will be held > by the CFDictionary. Pass 0 for no hint. The implementation may > ignore this hint, or may use it to optimize various > operations. A dictionary's actual capacity is only limited by > address space and available memory constraints). If this > parameter is negative, the behavior is undefined. > > Since CFDictionary and NSDictionary have the same implementation under the > hood, I think the capacity will have the same effect at runtime whichever API > you use.
IIRC, the semantic of the capacity parameter changed in 10.5. Before 10.5, it specified the max capacity and trying to insert more elements was documented as an undefined behavior. -- Jean-Daniel _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
