Re: [PATCH v4 1/2] system_data_types.7: Add 'void *'

[Paul Eggert]

On 10/2/20 8:14 AM, Alejandro Colomar wrote:

> +.I void *

GNU style is a space between "void" and "*", so this should be '.I "void\ *"', 
both here and elsewhere. The backslash prevents a line break.

> +Conversions from and to any other pointer type are done implicitly,
> +not requiring casts at all.
> +Note that this feature prevents any kind of type checking:
> +the programmer should be careful not to cast a

Change "cast" to "convert", since the point is that no cast is needed.

> +.PP
> +The conversion specifier for
> +.I void *
> +for the
> +.BR printf (3)
> +and the
> +.BR scanf (3)
> +families of functions is
> +.BR p ;
> +resulting commonly in
> +.B %p
> +for printing
> +.I void *
> +values.

%p works with any object pointer type (or in POSIX, any pointer type), not just 
 void *.

Should also mention "void const *", "void volatile *", etc. Plus it really 
should talk about plain "void", saying that it's a placeholder as a return value 
for functions, for casting away values, and as a keyword in C11 for functions 
with no parameters (though this is being changed in the next C version!). I sent 
comments about most of this stuff already.