On Nov 1, 2012, at 7:15 PM, Graham Cox <graham....@bigpond.com> wrote:
> Hi all, I'm having trouble figuring this out. > > I have a logging function thus: > > void GCLogObjCMethod( id obj, SEL selector, NSUInteger lineNumber, > NSString* tag, NSString* format, ... ); > > I'd like to be able to wrap this using a macro that automatically supplies > the object, selector, line number and 'tag' (which is usually the class name > of the object) and leaves only the format and the variable arguments to be > supplied. I haven't been able to come up with a way that works. Can it be > done? i.e. what I want is a macro: > > GCLOGOC( @"this is a format string: %@, with any number of params: %@", > paramA, paramB ); > > and this expands to: > > GCLogObjCMethod( self, _cmd, __LINE__, NSStringFromClass([self class]), > @"this is a format string: %@, with any number of params: %@", paramA, paramB > ); > > (or expands to nothing at all if logging has been turned off). > > How can I define the macro so it can handle the variable parameter list? Look up __VA_ARGS__. I think you can build what you want that way. -- Greg Parker gpar...@apple.com Runtime Wrangler _______________________________________________ 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
