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Groups > comp.lang.c++ > #87080 > unrolled thread

why use static_cast ?

Started byLynn McGuire <lynnmcguire5@gmail.com>
First post2022-10-19 21:01 -0500
Last post2022-10-20 13:21 -0500
Articles 4 on this page of 64 — 22 participants

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  why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-19 21:01 -0500
    Re: why use static_cast ? "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-10-19 19:40 -0700
      Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-20 00:21 -0500
        Re: why use static_cast ? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-10-19 23:21 -0700
          Re: why use static_cast ? Juha Nieminen <nospam@thanks.invalid> - 2022-10-20 07:19 +0000
            Re: why use static_cast ? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-10-20 00:21 -0700
        Re: why use static_cast ? Paul N <gw7rib@aol.com> - 2022-10-20 04:23 -0700
          Re: why use static_cast ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-10-20 14:14 +0100
          Re: why use static_cast ? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-10-20 09:17 -0700
            Re: why use static_cast ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-10-20 09:52 -0700
              Re: why use static_cast ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-11-15 17:10 -0800
                Re: why use static_cast ? Juha Nieminen <nospam@thanks.invalid> - 2022-11-16 09:26 +0000
                  Re: why use static_cast ? David Brown <david.brown@hesbynett.no> - 2022-11-16 14:36 +0100
                  Re: why use static_cast ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-11-20 05:54 -0800
        Re: why use static_cast ? "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-10-20 08:11 -0700
    Re: why use static_cast ? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-10-19 20:09 -0700
    Re: why use static_cast ? Juha Nieminen <nospam@thanks.invalid> - 2022-10-20 05:44 +0000
      Re: why use static_cast ? Gawr Gura <gawrgura@mail.hololive.com> - 2022-10-20 14:50 +0000
        Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-20 17:53 +0300
    Re: why use static_cast ? Bonita Montero <Bonita.Montero@gmail.com> - 2022-10-20 08:52 +0200
      Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-20 17:52 +0300
    Re: why use static_cast ? scott@slp53.sl.home (Scott Lurndal) - 2022-10-20 13:55 +0000
      Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-20 17:55 +0300
        Re: why use static_cast ? scott@slp53.sl.home (Scott Lurndal) - 2022-10-20 15:01 +0000
          Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-20 18:32 +0300
            Re: why use static_cast ? scott@slp53.sl.home (Scott Lurndal) - 2022-10-20 16:07 +0000
              Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-20 20:14 +0300
                Re: why use static_cast ? scott@slp53.sl.home (Scott Lurndal) - 2022-10-20 17:30 +0000
                  Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-20 20:41 +0300
                Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-21 14:05 -0500
                  Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-22 00:09 +0300
                  Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-22 08:47 +0300
                    Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-22 15:03 -0500
                      Re: why use static_cast ? Muttley@dastardlyhq.com - 2022-10-23 07:35 +0000
                        Re: why use static_cast ? JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-10-23 15:28 +0300
                        Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-23 14:13 -0500
                      Re: why use static_cast ? Manfred <noname@add.invalid> - 2022-10-23 20:27 +0200
                      Re: why use static_cast ? Michael S <already5chosen@yahoo.com> - 2022-10-23 15:04 -0700
                        Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-23 23:14 -0500
            Re: why use static_cast ? Bonita Montero <Bonita.Montero@gmail.com> - 2022-10-21 17:21 +0200
        Re: why use static_cast ? Bonita Montero <Bonita.Montero@gmail.com> - 2022-10-21 17:24 +0200
      Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-20 13:21 -0500
        Re: why use static_cast ? Manfred <noname@add.invalid> - 2022-10-21 05:52 +0200
          Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-21 13:59 -0500
            Re: why use static_cast ? Bo Persson <bo@bo-persson.se> - 2022-10-22 18:31 +0200
              Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-22 15:05 -0500
              Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-22 17:34 -0500
          Re: why use static_cast ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-11-02 17:54 -0700
            Re: why use static_cast ? Öö Tiib <ootiib@hot.ee> - 2022-11-03 08:51 -0700
              Re: why use static_cast ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-11-15 16:19 -0800
                Re: why use static_cast ? Öö Tiib <ootiib@hot.ee> - 2022-11-15 23:02 -0800
                  Re: why use static_cast ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-11-20 05:59 -0800
                    Re: why use static_cast ? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2022-11-20 15:05 +0100
                      Re: why use static_cast ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-11-20 07:22 -0800
                        Re: why use static_cast ? Öö Tiib <ootiib@hot.ee> - 2022-11-20 08:40 -0800
                          Re: why use static_cast ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-12-28 20:43 -0800
      Re: why use static_cast ? Juha Nieminen <nospam@thanks.invalid> - 2022-11-04 07:27 +0000
        Re: why use static_cast ? scott@slp53.sl.home (Scott Lurndal) - 2022-11-04 13:47 +0000
          Re: why use static_cast ? Vir Campestris <vir.campestris@invalid.invalid> - 2022-11-05 21:34 +0000
          Re: why use static_cast ? James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-11-06 03:25 -0500
          Re: why use static_cast ? Paavo Helde <eesnimi@osa.pri.ee> - 2022-11-06 17:34 +0200
            Re: why use static_cast ? Juha Nieminen <nospam@thanks.invalid> - 2022-11-07 07:13 +0000
        Re: why use static_cast ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-04 09:09 -0700
    Re: why use static_cast ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-20 13:21 -0500

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#87268

FromPaavo Helde <eesnimi@osa.pri.ee>
Date2022-11-06 17:34 +0200
Message-ID<tk8k5i$3672u$1@dont-email.me>
In reply to#87229
04.11.2022 15:47 Scott Lurndal kirjutas:
> Juha Nieminen <nospam@thanks.invalid> writes:
>> Scott Lurndal <scott@slp53.sl.home> wrote:
>>> Young C++ programmers don't understand C, so they think
>>> that static_cast<fem::str<8>*> is more "readable". Heh.
>>
>> So your opinion on what's "readable" and what isn't is better than my
>> opinion on the subject because... why?
> 
> It's an opinion.  You know the old saying.
> 
>>
>> I'm 99% certain that the main (if not even only) reason why you don't like
>> static_cast is because it's longer. That's it. No other reason.
> 
> Actually, I don't like it because it doesn't add anything useful over
> a plain c-style cast.

But it does. If I get e.g. constness wrong in my casting, a C-style cast 
won't bat an eye whereas static_cast will complain loudly. Ditto for 
many other mistakes which I might make. If you never make any mistakes 
when typing code, then it does not matter, but for me it does.

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#87274

FromJuha Nieminen <nospam@thanks.invalid>
Date2022-11-07 07:13 +0000
Message-ID<tkab7j$1bm8$1@gioia.aioe.org>
In reply to#87268
Paavo Helde <eesnimi@osa.pri.ee> wrote:
> 04.11.2022 15:47 Scott Lurndal kirjutas:
>> Juha Nieminen <nospam@thanks.invalid> writes:
>>> Scott Lurndal <scott@slp53.sl.home> wrote:
>>>> Young C++ programmers don't understand C, so they think
>>>> that static_cast<fem::str<8>*> is more "readable". Heh.
>>>
>>> So your opinion on what's "readable" and what isn't is better than my
>>> opinion on the subject because... why?
>> 
>> It's an opinion.  You know the old saying.
>> 
>>>
>>> I'm 99% certain that the main (if not even only) reason why you don't like
>>> static_cast is because it's longer. That's it. No other reason.
>> 
>> Actually, I don't like it because it doesn't add anything useful over
>> a plain c-style cast.
> 
> But it does. If I get e.g. constness wrong in my casting, a C-style cast 
> won't bat an eye whereas static_cast will complain loudly. Ditto for 
> many other mistakes which I might make. If you never make any mistakes 
> when typing code, then it does not matter, but for me it does.

Indeed. In some cases eg. casting away constness may not only lead to bugs,
but in fact be UB. Such as casting away the constness of a char pointer
pointing to a string literal, and then trying to modify the contents of
that string.

With static_cast the compiler will tell you that you are trying to
cast away constness, and it may immediately indicate your error. With
a C style cast you might never notice, and the program may even seem
to work fine... until one day it doesn't.

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#87233

FromKeith Thompson <Keith.S.Thompson+u@gmail.com>
Date2022-11-04 09:09 -0700
Message-ID<877d0an1la.fsf@nosuchdomain.example.com>
In reply to#87223
Juha Nieminen <nospam@thanks.invalid> writes:
> Scott Lurndal <scott@slp53.sl.home> wrote:
>> Young C++ programmers don't understand C, so they think
>> that static_cast<fem::str<8>*> is more "readable". Heh.
>
> So your opinion on what's "readable" and what isn't is better than my
> opinion on the subject because... why?
>
> I'm 99% certain that the main (if not even only) reason why you don't like
> static_cast is because it's longer. That's it. No other reason.
>
> I have noticed a very common psychological phenomenon that for some
> reason beginner programmers try to write code that's as short as possible,
> even when that comes at the cost of legibility (a phenomenon that I have
> named "the brevity-over-clarity style of programming"). Way too many
> programmers never learn out of this bad habit.

Wouldn't it be better to call it the BOCSOP?  8-)}

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

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#87109

FromLynn McGuire <lynnmcguire5@gmail.com>
Date2022-10-20 13:21 -0500
Message-ID<tis3jv$ct2g$2@dont-email.me>
In reply to#87080
On 10/19/2022 9:01 PM, Lynn McGuire wrote:
> I put the following cast into my code and one of my programmers wants me 
> to use static cast.  Why ?
>     https://en.cppreference.com/w/cpp/language/static_cast
> 
>     longint nfac [8];
>     fem::str <8> * nfac_str = (fem::str <8> *) nfac;
> 
> fem::str <8> is an 8 character object that acts like a Fortran 
> character*8.  longint is a long long.
> 
> Thanks,
> Lynn

Thanks to all for the views !  They were good.

Lynn

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