On Mon, 23 Nov 2015 06:45:54 -0500
Hendrik Boom <hend...@topoi.pooq.com> wrote:
> There is a well-known hack in C wheereby you rely on C allocating
> fields of structures independently of later fields.
>
> Thus with
> struct foo{char c, int d, float e,}
> and
> struct bar{char c, int d,}
>
> (forgive me if I need semicolons here; I've used too many languages
> in the alst year to remember the surface syntax)
>
> you can rely on c and d having the same offsets in both structures,
> and so you can happily cast between pointers to foo and bar as long
> as you don't mess with e.
>
> And, of course, you can have a pointer to a table of methods as the
> first entry in all of these structures.
Aren't C unions the "official" way to deal with these situations?
SteveT
Steve Litt
November 2015 featured book: Troubleshooting Techniques
of the Successful Technologist
http://www.troubleshooters.com/techniques
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