Hi Alejandro,
> - I have plans for improving _Countof as a GNU extension to work on
> array parameters to functions. I mean making this possible:
>
> wchar_t *
> wmemset(size_t n; wchar_t wcs[n], wchar_t wc, size_t n)
> {
> for (size_t i = 0; i < countof(wcs); i++)
> wcs[i] = wc;
> return wcs;
> }
The sizeof operator does not work well in this case, right? So that would be
a case where countof works _better_ than sizeof.
> What worries me of adding countof to C++ is that they may use it in
> some way that could preclude my planned extension. So I'll not
> remind C++ people about this until I made sure my extension is
> deployed in both GCC and Clang, and maybe in ISO C.
While I understand this, it still means that gnulib — which strives to make
the same code usable in C++ like in C — will probably have to override
<stdcountof.h> roughly like this:
#ifdef __cplusplus
template <typename T, size_t N>
constexpr size_t countof(T const (&)[N]) {
return N;
}
#else
# define countof _Countof
#endif
(And I have no idea whether this definition will work for variable-sized
arrays and for function parameters.)
Bruno
