Hi Paul,
On Sat, Jun 07, 2025 at 03:37:27PM -0700, Paul Eggert wrote:
> On 2025-06-07 13:21, Alejandro Colomar wrote:
> > On Sat, Jun 07, 2025 at 09:47:49PM +0200, Basil L. Contovounesios wrote:
> > > I tried using Gnulib's countof macro for counting the number of
> > > arguments passed to a variadic function, e.g.:
> > >
> > > #define CALL(fn, args) ((fn) (countof (args), (args)))
> > > #define CALLN(fn, ...) CALL (fn, ((int []) {__VA_ARGS__}))
> > Huh! This is quite interesting. :-)
>
> I introduced CALLN to Emacs in 2015 and it has proved useful.Thanks! > As a caveat, > it requires at least one function argument if you want to be portable to > C99, as C99 prohibits empty initializers. I've been wondering tonight: this implies that all arguments in __VA_ARGS__ are integers, doesn't it? A pointer wouldn't work, as the array would initialize an int with a pointer without a cast. Have a lovely day! Alex -- <https://www.alejandro-colomar.es/>
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