Hi Greg, On 14/10/2010, at 17:50, Greg Parker wrote:
> There's already a method -[NSArray initWithObjects:], but it accepts a > nil-terminated list of objects. The compiler warns if you call [array > initWithObjects:a, b, c] and forget the nil terminator. > > `[self alloc]` returns `id`, so the compiler has to guess which method > prototype to use, yours or NSArray's. If it guesses wrong, you'll get that > warning. Sometimes you'll get crashes or incorrect parameter values when the > compiler guesses wrong, but in this case the generated code happens to work > correctly. > > I'd recommend changing your method name. -initWithArray: would work, matching > -[NSArray initWithArray:(NSArray*)array]. > > The other workaround is to cast the result of +alloc: [(NSFSomeClass*)[self > alloc] initWithObjects:someObjects]. But that's fragile if you forget > somewhere. > > >> Another observation: >> >> GCC 4.0 = no warning >> GCC 4.2 = warning >> LLVM GCC 4.2 = warning >> LLVM compiler 1.5 = no warning >> >> Is this a GCC 4.2/LLVM GCC4.2 bug? > > No. gcc-4.0 simply does not implement the sentinel warning for Objective-C > methods. If gcc-4.0 guesses wrong, there's no warning and the code happens to > run correctly. > > >> And while we're at it... since the library I'm writing works on both Mac OS >> X and iOS, which compiler is recommended? > > I'd recommend llvm-gcc on all current platforms and architectures. > > > -- > Greg Parker gpar...@apple.com Runtime Wrangler Done. Thanks again for the help, -- Tito _______________________________________________ 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
