On Wed, Mar 10, 2021 at 4:15 AM Hal Murray via devel <devel@ntpsec.org> wrote:
> > How do I compute at compile time the offset of a field into a struct? > > The context is putting it into a table. > ]offsetof(struct, field)[ wrapped in macros. I pulled that from the include/json.h file of gpsd > I know about structs and unions. Unions are type-unsafe. Is there a > type-safe way to handle a struct that needs several variations? > > The struct will have a type field to tell me which variation it is. I > will > have a macro to build each variation. There is only one place that > looks at > the variations. It will do a select on the type field with a few lines of > code for each variation. So all in all, it's pretty clean. I'm just > looking > for a way to do better. > I typed in ]c tagged union[ after getting curious a while back, my bulimic parrot level instant expert credentials for it are long expired. I remember though that I just hit the first SO post[1] on the topic. [1] https://stackoverflow.com/questions/42844423/writing-a-safe-tagged-union-in-c
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