AW: AW: Feature request for "friendship" of pointers in "C"

[aotto]

Hi, as i mentioned earlier… the "not having" create a couple of problems:

1. the "void-pointer-inflation"
 Â Â  you can rewrite "method_base(struct base* hdl, ...)" win
 Â Â  "method_base(void* hdl, ...)" this seems to solve the problem
 Â Â  BUT you definitely loos the type-check because other pointer as "A" 
and "B"
 Â Â  also allowed.

2. the "cast inflation"
 Â Â  you can add the "CPP" wrapper to "method_base" this will act like 
"void*"
 Â Â  but you loose the "type-check also"

3. even if you use "&aObj->obj" this create EXTRA CODE which add only 
CRASH-scenarios
    and add EXTRA overhead…

3. there is only ONE clear solution which NOT loose the "type-checking" 
and DON'T add
 Â Â  extra code and this solution is the "frienddef"

mfg AO

On 03.02.20 10:20, J Decker wrote:
>
>
> On Mon, Feb 3, 2020 at 1:10 AM aotto <aotto1968@t-online.de 
> <mailto:aotto1968@t-online.de>> wrote:
>
>     On 03.02.20 10:07, J Decker wrote:
>     > On Mon, Feb 3, 2020 at 12:23 AM aotto <aotto1968@t-online.de
>     <mailto:aotto1968@t-online.de>> wrote:
>     >
>     >> Hi,
>     >>
>     >> there is an easy test, if Stefan is right and I'm wrong.
>     >>
>     >> 1. cast an INVALID Pointer to "aObj"
>     >>
>     > how would friend prevent an invalid pointer pass?
>     → I have a pointer-type-and-valid test in my software, this mean
>     Â Â  I know if a pointer is "valid" or not... but this works only if
>     Â Â  I get the pointer into my "base_method".
>
>
> C doesn't have any such thing, no do any other developer, so how would 
> it help them? (you fell off the list)