The ability to call a function pointer fp with the syntax fp() rather than
(*fp)() came rather late, I think at Bjarne's suggestion or example. Pretty
sure it was not in v7 C, as you observe.

Convenient though the shorthand may be, it always bothered me as
inconsistent and misleading. (I am pretty sure I used it sometimes
regardless.)

-rob


On Sat, Apr 25, 2020 at 12:48 PM Adam Thornton <athornton@gmail.com> wrote:

>
>
> On Apr 24, 2020, at 7:37 PM, Charles Anthony <charles.unix.pro@gmail.com>
> wrote:
>
>
>
> On Fri, Apr 24, 2020 at 7:00 PM Adam Thornton <athornton@gmail.com> wrote:
>
>> This doesn’t like the function pointer.
>>
>
>> $ cc -c choparg.c
>> choparg.c:11: Call of non-function
>>
>> Perhaps:
>
>     (*fcn)(arg);
>
>
> We have a winner!
>
> Also, Kartik, dunno where it is on the net, but if you install a v7
> system, /usr/src/cmd/c
>
> Adam
>
>