Sending a message to a Toll free bridge
The documentation states: CFArray is “toll-free bridged” with its Cocoa Foundation counterpart, NSArray. This means that the Core Foundation type is interchangeable in function or method calls with the bridged Foundation object. Therefore, in a method where you see an NSArray * parameter, you can pass in a CFArrayRef Does this also mean: any message you can send to an NSArray, you can send also to an CFArrayRef? NSFont *fo = [ NSFont fontWithName: @Thonburi size: 0 ]; CTFontRef font = (__bridge CTFontRef)fo; CFArrayRef tags = CTFontCopyAvailableTables ( font, 0 ); NSArray *tagsArray = CFBridgingRelease(tags); // next line prints: class __NSCFArray count: 18 NSLog(@%s class %@ count: %lu,__FUNCTION__, [tagsArray class], [tagsArray count]); So sending messages to an CFArrayRef seems to be ok. Or not? But then this line crashes: NSString *tagDescription = [ tagsArray description ]; My mistake? My false assumption? Gerriet. ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Sending a message to a Toll free bridge
I don't believe that the array that CTFontCopyAvailableTables() returns contains CFTypes. So yes, CFArray is bridgeable. But in this case that isn't so useful since the values aren't. On Mon, Nov 25, 2013 at 3:23 AM, Gerriet M. Denkmann gerr...@mdenkmann.dewrote: The documentation states: CFArray is “toll-free bridged” with its Cocoa Foundation counterpart, NSArray. This means that the Core Foundation type is interchangeable in function or method calls with the bridged Foundation object. Therefore, in a method where you see an NSArray * parameter, you can pass in a CFArrayRef Does this also mean: any message you can send to an NSArray, you can send also to an CFArrayRef? NSFont *fo = [ NSFont fontWithName: @Thonburi size: 0 ]; CTFontRef font = (__bridge CTFontRef)fo; CFArrayRef tags = CTFontCopyAvailableTables ( font, 0 ); NSArray *tagsArray = CFBridgingRelease(tags); // next line prints: class __NSCFArray count: 18 NSLog(@%s class %@ count: %lu,__FUNCTION__, [tagsArray class], [tagsArray count]); So sending messages to an CFArrayRef seems to be ok. Or not? But then this line crashes: NSString *tagDescription = [ tagsArray description ]; My mistake? My false assumption? Gerriet. ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/stephen.butler%40gmail.com This email sent to stephen.but...@gmail.com ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Sending a message to a Toll free bridge
Le 25 nov. 2013 à 10:23, Gerriet M. Denkmann gerr...@mdenkmann.de a écrit : The documentation states: CFArray is “toll-free bridged” with its Cocoa Foundation counterpart, NSArray. This means that the Core Foundation type is interchangeable in function or method calls with the bridged Foundation object. Therefore, in a method where you see an NSArray * parameter, you can pass in a CFArrayRef Does this also mean: any message you can send to an NSArray, you can send also to an CFArrayRef? NSFont *fo = [ NSFont fontWithName: @Thonburi size: 0 ]; CTFontRef font = (__bridge CTFontRef)fo; CFArrayRef tags = CTFontCopyAvailableTables ( font, 0 ); NSArray *tagsArray = CFBridgingRelease(tags); // next line prints: class __NSCFArray count: 18 NSLog(@%s class %@ count: %lu,__FUNCTION__, [tagsArray class], [tagsArray count]); So sending messages to an CFArrayRef seems to be ok. Or not? But then this line crashes: NSString *tagDescription = [ tagsArray description ]; My mistake? My false assumption? You just hit a corner case. Toll free bridging is supported only for collections of objects compatible with id. CTFontCopyAvailableTables() is one of the very few API that returns a CFArrayRef that contains plain int value, and so cannot be safely converted to NSArray. An other well known corner case is when you try to cast a CFMutableDictionary into a NSMutableDictionary. The later requires that key are copyable objects while the former support other types of keys. Except such cases, you should be able to call any NSArray method on a CFArrayRef. -- 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
