On Fri, May 26, 2023 at 11:22:36AM -0700, Linus Torvalds wrote: > But you can actually do the 'bool done' using the exact same type you > have for the guard - just make it a pointer instead, and use NULL for > "not done" and non-NULL for "done". It ends up acting exactly like a > boolean. Damn; I've actually seen that and should've thought of it. > IOW, something like this: > > #define variable_scope(type, enter, exit) \ > for (type *_done = NULL, _scope __cleanup(exit) = enter; > !_done; _done = (void *)8) > > #define scoped(type, init...) \ > variable_scope(scope_##type##_t, scope_##type##_init(init), > scope_##type##_cleanup) > > I dunno. I didn't *test* the above. Maybe you already tried something > like the above, and there's a reason why it doesn't work. I have not; let me go try that. That does look *much* nicer.
