On Wed, Nov 11, 2009 at 9:04 AM, grauzone <n...@example.net> wrote: > Walter Bright wrote: >> >> When I originally worked out ideas for D, there were many requests from >> the C and C++ community for a 'strong' typedef, and so I put one in D. I >> didn't think about it too much, just assumed that it was a good idea. >> >> Now I'm not so sure. Maybe it should be removed for D2. >> >> Does anyone use typedef's? >> >> What do you use them for? >> >> Do you need them? > > One _actual_ use of typeof is to force a different array initializer (for > performance reasons): > > typedef int Foo = 1; > > Foo[] arr; > arr.length = 567; > //with int[] arr, you now had to do arr[] = 1; > > Also, you can easily define new exception classes: > > //no need to write a ctor which just calls the super ctor > typedef Exception MyException;
Does this actually work now? Long ago this was one of the things I first thought I could use typedefs for, but it didn't work. I think it was because the compiler no longer recognizes MyException as a subtype of Exception anymore, but it was a long time ago, so I don't recall for sure. --bb