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Re: Patch: New null_terminated attribute for C/C++
On Oct 15, 2002, Per Bothner <per@bothner.com> wrote:
> Fergus Henderson wrote:
>> If foo() is a varargs function that expects its argument list to be
>> terminated by a null pointer, and the user writes
>>
>> foo(..., NULL);
>> then this code will do the wrong thing on some platforms, and so the
>> compiler should warn about it.
> The conclusion I got from the discussion was that there does not
> exist any such platform supported for Gcc where the wrong thing will
> happen
Unless the varargs function actually expected a pointer-to-member.
That's the difference between C and C++: there are no
pointers-to-members in C. No matter how magic NULL is, it can't tell
whether the programmer meant a C-compatible pointer or a C++
pointer-to-member.
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist Professional serial bug killer