Date: Sun, 29 Jul 2012 15:38:59 -0400 From: Arnaud Lacombe <lacombar@gmail.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>, David Chisnall <theraven@freebsd.org>, current@freebsd.org Subject: Re: RFC: libkern version of inet_ntoa_r Message-ID: <CACqU3MVNCOdde7atRVT7xaYH1qHjm=4uS0Eih8EgG3=DDaOGCw@mail.gmail.com> In-Reply-To: <20120729191958.GB85015@onelab2.iet.unipi.it> References: <20120725155211.GA33971@onelab2.iet.unipi.it> <alpine.BSF.2.00.1207282213171.4474@ai.fobar.qr> <20120729095833.GB80946@onelab2.iet.unipi.it> <CBCC6E24-8D03-422E-B571-1B62FB7667E6@FreeBSD.org> <20120729191958.GB85015@onelab2.iet.unipi.it>
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Hi,
On Sun, Jul 29, 2012 at 3:19 PM, Luigi Rizzo <rizzo@iet.unipi.it> wrote:
> Remapping f(a) into f(a, b) requires both a macro
> and a wrapping function, something like this
>
> T __f(T1 a, T2 b) { return f(a, b); }
> #define f(a) __f(a, b)
>
This can be done way more easily:
void fn(int a, int b)
{
printf("%d %d\n", a, b);
}
#define fn(x) ({ fn(x, 42); })
int main(int argc, char **argv)
{
fn(0);
return 0;
}
works just fine.
> but i am not so interested in participating to the IOCCC :)
>
maybe you should ;-)
- Arnaud
ps: this construct is used all over the Linux kernel compatibility libraries.
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