Am Freitag, dem 09.01.2026 um 14:11 +0000 schrieb Richard Earnshaw (foss) via
Gcc:
> On 09/01/2026 13:47, Alejandro Colomar via Gcc wrote:
> > Hi Florian,
> >
> > On Fri, Jan 09, 2026 at 02:37:52PM +0100, Florian Weimer wrote:
> > > * Alejandro Colomar via Gcc:
> > >
> > > > If there's no way, it would be interesting to add compound literals of
> > > > function type to achieve this:
> > > >
> > > > #define strnulD(...) \
> > > > ((static inline auto \
> > > > (auto s)) \
> > > > { \
> > > > return s + strlen(s); \
> > > > }(__VA_ARGS__))
> > >
> > > This already works:
> > >
> > > static inline auto
> > > strnulD (auto s)
> > > {
> > > return s + strlen (s);
> > > }
> >
> > Sorry; I forgot to mention I mean in C, not C++.
> >
> > For a second, you got me illusioned and thought that might have been
> > implemented in C. :-)
> >
> > alx@devuan:~/tmp$ cat strnul.c
> > #include <string.h>
> >
> > static inline auto
> > strnulD(auto s)
> > {
> > return s + strlen(s);
> > }
> >
> > int
> > main(void)
> > {
> > const char *p = strnulD("foo");
> > }
> > alx@devuan:~/tmp$ gcc strnul.c
> > strnul.c:4:14: error: storage class specified for parameter ‘s’
> > 4 | strnulD(auto s)
> > | ^
> > strnul.c:3:1: error: ‘auto’ requires a plain identifier, possibly with
> > attributes, as declarator
> > 3 | static inline auto
> > | ^~~~~~
> > strnul.c: In function ‘main’:
> > strnul.c:12:25: error: implicit declaration of function ‘strnulD’
> > [-Wimplicit-function-declaration]
> > 12 | const char *p = strnulD("foo");
> > | ^~~~~~~
> > strnul.c:12:25: error: initialization of ‘const char *’ from ‘int’
> > makes pointer from integer without a cast [-Wint-conversion]
> >
> > > No need to invent new syntax for it.
> >
> > Any chance we can get this in GNU C?
> >
> >
>
> C23 has auto in C.
>
Yes, but a much more limited form. Above function is a template
and I do not really would want to have template in C.
Martin
