The first gives me the following error: Implicit conversion of Objective-C pointer type 'NSString *' to C pointer type 'CFStringRef' (aka 'const struct __CFString *') requires a bridged cast
Tom Davie On Jul 27, 2013, at 8:31 PM, Matt Neuburg <m...@tidbits.com> wrote: > I feel like I've asked this before, but I don't feel I'm grasping the answer. > Why don't these work the same way under ARC: > > NSString* answer = @"42"; > int ans = CFStringGetIntValue((CFStringRef)answer); > > and > > NSURL* imageSource = [NSURL new]; > CGImageSourceRef src = > CGImageSourceCreateWithURL((CFURLRef)imageSource, nil); > > The first one compiles (with no explicit __bridge). The second one doesn't; > you must say __bridge explicitly. But why? They look completely parallel to > me. > > The mystery is compounded by the fact that if you omit the cast entirely in > the first example, the compiler claims that you need a bridged cast. But you > don't; you just need a cast. That feels like a bug; if a mere cast is > sufficient, the compiler should say so (and Fix-It should offer it as a > possible fix). > > m. > > -- > matt neuburg, phd = m...@tidbits.com, http://www.apeth.net/matt/ > pantes anthropoi tou eidenai oregontai phusei > Programming iOS 6! http://shop.oreilly.com/product/0636920029717.do > RubyFrontier! http://www.apeth.com/RubyFrontierDocs/default.html > TidBITS, Mac news and reviews since 1990, http://www.tidbits.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/tom.davie%40gmail.com > > This email sent to tom.da...@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
