Re: Recursion, Yo

bart <bc@freeuk.com> writes:

On 12/04/2024 06:32, Janis Papanagnou wrote:

On 12.04.2024 04:31, Lawrence D'Oliveiro wrote:

On Thu, 11 Apr 2024 15:15:35 GMT, Scott Lurndal wrote:
>

As someone who cut his teeth on
Unix V6, an empty parameter list is less self-documenting than an
explicit (void).

>
Should that apply when calling the function as well?
>
     res = func(void);
>
instead of
>
     res = func();

>
(What happens in Python when 'func' has multiple /optional/ parameters
which have all been omitted; do you need to document them in the call
to distinguish this from a call to a function which genuinely has no
arguments?)

Nothing special.  Python requires parentheses on all function calls.
res = func() assigns to res the value returned by the function func.
res = func assigns to res a value of type "function".

It's similar to what C does, except that in C there's no way res can be
assignment-compatible with both func and func().

In Ada, a procedure or function call with no arguments doesn't use
parentheses:

    res := func;

Ada has no values of function type (which is why it can get away with
omitting parentheses for calls with no arguments), though it does have
are the equivalent of pointers to functions.  (The lack of parentheses
on calls with no arguments is something that always annoyed me about
Ada.)

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Medtronic
void Void(void) { Void(); } /* The recursive call of the void */