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From: Bonita Montero <Bonita.Montero@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Command line globber/tokenizer library for C?
Date: Fri, 13 Sep 2024 15:20:25 +0200
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Am 13.09.2024 um 14:25 schrieb Michael S:
> On Fri, 13 Sep 2024 14:12:32 +0200
> Bonita Montero <Bonita.Montero@gmail.com> wrote:
> 
>> Am 13.09.2024 um 10:38 schrieb Michael S:
>>> On Fri, 13 Sep 2024 07:28:34 +0200
>>> Bonita Montero <Bonita.Montero@gmail.com> wrote:
>>>    
>>>> Am 12.09.2024 um 21:38 schrieb Michael S:
>>>>   
>>>>> Callback is as easy in C as in C++.
>>>>
>>>> Absolutely not because callbacks can't have state in C.
>>>>
>>>>   
>>>
>>> So what is 'context' parameter in my code?
>>
>> In C++ the state is an own internal "this"-like object and you dont't
>> need any explicit parameters.
> 
> So, do you admit that callback in C can have state?

No, because this is a parameter and a lambda is a glue of an
object and a calling operator. The object is the state and a
C function-pointer misses that.

> Bad software engineering practice that easily leads to incomprehensible
> code.

I'm using this convention with nearly any lambda and if I can't
remember later which outer variables are used I remove the & and
the temporary non-referencing locals are underlined red and when
I've notice which locals were used I press ^Z.

> When in C++ and not in mood for C-style, I very much prefer functors.
> Ideologically they are the same as C-style context, but a little
> sugarized syntactically.

No, A C++ functor may be an object with a calling operator. In C you
don't have the implicit object; that's magnitudes less convenient. C
is always multiple times more work.