Re: is it possible to have functions with 0, 1, or 2 args?

Path	csiph.com!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From	Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups	comp.lang.c
Subject	Re: is it possible to have functions with 0, 1, or 2 args?
Date	Mon, 12 Aug 2024 02:28:24 -0700
Organization	A noiseless patient Spider
Lines	25
Message-ID	<8634naccp3.fsf@linuxsc.com> (permalink)
References	<7q-dnbTDU4oBES37nZ2dnZfqnPednZ2d@brightview.co.uk> <20240805151946.00000bce@yahoo.com> <86wmkmfhaz.fsf@linuxsc.com> <v9chcl$37e8f$1@dont-email.me>
MIME-Version	1.0
Content-Type	text/plain; charset=us-ascii
Injection-Date	Mon, 12 Aug 2024 11:28:24 +0200 (CEST)
Injection-Info	dont-email.me; posting-host="f42e4005105099d89c60a754521770ce"; logging-data="3404816"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX180Z7v6to1LchC5AHbk8VyZuiGtoyxKgHE="
User-Agent	Gnus/5.11 (Gnus v5.11) Emacs/22.4 (gnu/linux)
Cancel-Lock	sha1:42MY2PpJyU8ej18fa9IL4l2bT5E= sha1:8GWyDfPaUfEFuLlkArleFb1l2/o=
Xref	csiph.com comp.lang.c:387505

Show key headers only | View raw

Richard Harnden <richard.nospam@gmail.invalid> writes:

> On 12/08/2024 06:20, Tim Rentsch wrote:
>
>> Michael S <already5chosen@yahoo.com> writes:
>>
>>> On Mon, 05 Aug 2024 08:26:04 +0000
>>> Mark Summerfield <mark@qtrac.eu> wrote:
>>>
>>> According to my understanding, vararg functions without arguments will
>>> become possible in C23.  But since fully functional C23 compilers do not
>>> exist yet, right now the answer to your question is "No".
>>
>> Even in C99 varargs functions can be called without arguments.
>> The question here is more subtle.  In fact it is possible even
>> in C99 and C11 to do what he wants, but it isn't easy, and it
>> is far from obvious how to go about it.  Still, if the question
>> is "can this be done?", the answer is Yes even now.
>
> How does va_start know where to, um, start from if there's no last
> named argument?

Sorry, I meant to say macros, not functions (using ... and __VA_ARGS__).
The original question is about macro definitions, not function
definitions, and I didn't read carefully enough.

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

is it possible to have functions with 0, 1, or 2 args? Mark Summerfield <mark@qtrac.eu> - 2024-08-05 08:26 +0000
  Re: is it possible to have functions with 0, 1, or 2 args? Michael S <already5chosen@yahoo.com> - 2024-08-05 15:19 +0300
    Re: is it possible to have functions with 0, 1, or 2 args? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 22:20 -0700
      Re: is it possible to have functions with 0, 1, or 2 args? Richard Harnden <richard.nospam@gmail.invalid> - 2024-08-12 09:33 +0100
        Re: is it possible to have functions with 0, 1, or 2 args? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-12 02:28 -0700
          Re: is it possible to have functions with 0, 1, or 2 args? Richard Harnden <richard.nospam@gmail.invalid> - 2024-08-12 11:37 +0100
            Re: is it possible to have functions with 0, 1, or 2 args? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-12 15:39 -0700
  Re: is it possible to have functions with 0, 1, or 2 args? Blue-Maned_Hawk <bluemanedhawk@invalid.invalid> - 2024-08-05 18:46 +0000
  Re: is it possible to have functions with 0, 1, or 2 args? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-08-07 23:04 +0000
  Re: is it possible to have functions with 0, 1, or 2 args? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 10:43 -0700
  Re: is it possible to have functions with 0, 1, or 2 args? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 22:15 -0700

csiph-web