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Groups > comp.lang.c++ > #84462

Re: Wikipedia

From Juha Nieminen <nospam@thanks.invalid>
Newsgroups comp.lang.c++
Subject Re: Wikipedia
Date 2022-06-02 08:53 +0000
Organization Aioe.org NNTP Server
Message-ID <t79tpd$n0b$1@gioia.aioe.org> (permalink)
References (9 earlier) <t775db$vp6$1@dont-email.me> <3115054b-750c-4967-a1d3-871aeea8fdebn@googlegroups.com> <t77jvb$55v$1@dont-email.me> <t79g0c$1sqg$1@gioia.aioe.org> <t79ilr$8iv$1@dont-email.me>

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Bonita Montero <Bonita.Montero@gmail.com> wrote:
>> Do you know every single name in the standard library? From a random list
>> of names could you point out with accuracy which ones are used in the
>> standard library and which ones aren't? How many programmers do you think
>> would be able to do that?
> 
> No, but my compiler does and gives me an error if there are any name
> clashes. And in rare cases where I can't disambiguate a symbol which
> could be part of multiple namespaces I right-click the symbol and
> click "Go to definition" or "Go to declaration" and that is it.
> So where's the problem ?

Code should be readable and easy to understand even without using some IDE.
If the understandability of your code relies on the reader using an IDE,
it's not well-designed code.

If it's not clear from a name in the code that it's something from the
standard library, that only helps making the code harder to read and
understand.

When you use "using namespace std;" and never use the "std::" prefix,
your code is bound to break with newer versions of the C++ standard,
which might introduce that name in the standard library. Moreover,
as mentioned, a third-party library may introduce (inadvertently or
otherwise) a name in the global namespace that's the same as a name
in the std namespace, which can then potentially cause name clashes.
That might not happen when you are developing the code that uses that
third-party library, but it may happen if that third-party library is
later updated.

I can't think of any situation where "using namespace std;" would
actually introduce some benefit to the code, in terms of readability
or otherwise. I can think of plenty of examples of the opposite.

The only technical reason I can think of where bringing a name from the
standard library to the current scope might have validity is in generic
code that wants to allow the calling code to overload standard library
functions. (AFAIK) the standard doesn't allow user code to add anything
to the std namespace, so if the calling code would want to overload
some standard library function, it would need to be done in another
scope. For example like this:

template<typename Value_t>
void foobar(Value_t value)
{
    using std::cos;

    // Allows overloading cos() for a custom Value_t:
    Value_t cosValue = cos(value);

    // ...
}

But even then it's better to bring individual names to the current
scope rather than the entire std namespace.

(Let me make a prediction here: You will respond by saying that you didn't
read any of this. Prove me wrong.)

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Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 02:59 +0200
  Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-05-29 05:46 +0000
    Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 08:03 +0200
      Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 08:34 +0200
      Re: Wikipedia Öö Tiib <ootiib@hot.ee> - 2022-05-29 01:36 -0700
        Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 10:37 +0200
          Re: Wikipedia Öö Tiib <ootiib@hot.ee> - 2022-05-29 02:09 -0700
            Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 11:16 +0200
              Re: Wikipedia Öö Tiib <ootiib@hot.ee> - 2022-05-29 03:08 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 12:44 +0200
              Re: Wikipedia Paavo Helde <eesnimi@osa.pri.ee> - 2022-05-29 16:05 +0300
                Re: Wikipedia Freethinker <freethinker@mymail.com> - 2022-05-29 15:19 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 15:27 +0200
                Re: Wikipedia Manu Raju <MR@invalid.invalid> - 2022-05-29 17:26 +0100
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 19:18 +0200
                Re: Wikipedia scott@slp53.sl.home (Scott Lurndal) - 2022-05-29 17:49 +0000
                Re: Wikipedia Manfred <noname@add.invalid> - 2022-05-30 00:25 +0200
                Re: Wikipedia Popping Mad <rainbow@colition.gov> - 2022-06-04 13:00 -0400
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-04 19:19 +0200
            Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 11:48 +0200
          Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-05-30 06:06 +0000
            Re: Wikipedia Popping Mad <rainbow@colition.gov> - 2022-06-04 13:02 -0400
    Re: Wikipedia Manu Raju <MR@invalid.invalid> - 2022-05-29 17:18 +0100
      Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-29 18:22 +0200
        Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-05-30 06:08 +0000
          Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-31 04:41 +0200
      Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-05-30 06:06 +0000
  Re: Wikipedia Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-05-30 19:31 +0100
  Re: Wikipedia Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-05-30 19:52 +0100
    Re: Wikipedia Manfred <noname@add.invalid> - 2022-05-31 14:34 +0200
      Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-31 15:15 +0200
        Re: Wikipedia Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-05-31 18:00 +0100
          Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-31 19:06 +0200
            Re: Wikipedia Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-05-31 18:43 +0100
              Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-31 19:48 +0200
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 09:26 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 09:44 +0200
                Re: Wikipedia Öö Tiib <ootiib@hot.ee> - 2022-06-01 01:47 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 13:53 +0200
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 17:05 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 17:06 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-02 04:57 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-02 07:43 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-02 08:53 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-02 12:56 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-02 12:46 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-02 14:56 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 04:14 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 06:19 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 04:26 +0000
                Re: Wikipedia Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-06-03 14:22 +0100
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 15:34 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-03 07:24 -0700
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 14:56 +0000
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-03 08:06 -0700
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-03 17:30 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-03 10:37 -0700
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-03 20:33 +0200
                Re: Wikipedia scott@slp53.sl.home (Scott Lurndal) - 2022-06-03 18:59 +0000
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-03 12:35 -0700
                Re: Wikipedia Freethinker <freethinker@mymail.com> - 2022-06-03 23:42 +0200
                Re: Wikipedia Muttley@dastardlyhq.com - 2022-06-04 08:10 +0000
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-03 11:59 -0700
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-04 15:27 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-04 15:31 +0000
                Re: Wikipedia Manfred <noname@add.invalid> - 2022-06-03 17:02 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-03 08:11 -0700
                Re: Wikipedia "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-06-03 14:23 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-02 14:58 +0200
                Re: Wikipedia Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-06-04 08:00 -0700
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-02 16:00 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-02 16:09 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-02 16:14 +0200
                Re: Wikipedia Popping Mad <rainbow@colition.gov> - 2022-06-04 13:20 -0400
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-04 19:23 +0200
                Re: Wikipedia Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-06-02 04:40 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-02 14:00 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-02 12:47 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-02 14:59 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 04:17 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 06:20 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 04:27 +0000
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-02 16:13 +0200
                Re: Wikipedia Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-06-02 10:09 -0700
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-02 22:35 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 04:22 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 06:23 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 04:28 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 06:35 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 05:22 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 07:23 +0200
                Re: Wikipedia "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-06-02 22:25 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 07:28 +0200
                Re: Wikipedia "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-06-02 22:31 -0700
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 06:22 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 08:38 +0200
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 10:14 +0000
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-03 06:32 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-03 15:35 +0200
                Re: Wikipedia "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-06-03 14:12 -0700
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-03 10:31 +0200
                Re: Wikipedia Manfred <noname@add.invalid> - 2022-06-02 19:12 +0200
                Re: Wikipedia Popping Mad <rainbow@colition.gov> - 2022-06-04 13:09 -0400
                Re: Wikipedia Manu Raju <MR@invalid.invalid> - 2022-06-02 17:54 +0100
                Re: Wikipedia Paavo Helde <eesnimi@osa.pri.ee> - 2022-06-02 20:40 +0300
                Re: Wikipedia Manu Raju <MR@invalid.invalid> - 2022-06-02 18:50 +0100
                Re: Wikipedia Juha Nieminen <nospam@thanks.invalid> - 2022-06-03 04:25 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 14:21 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-01 06:17 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 15:34 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-01 07:13 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 16:55 +0200
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 16:29 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 16:56 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-01 07:58 -0700
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 17:07 +0200
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 17:50 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 18:11 +0200
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 17:41 +0200
                Re: Wikipedia Manfred <noname@add.invalid> - 2022-06-01 17:42 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-01 09:12 -0700
                Re: Wikipedia Manfred <noname@add.invalid> - 2022-06-01 18:35 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 18:36 +0200
                Re: Wikipedia Manfred <noname@add.invalid> - 2022-06-01 18:59 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 19:04 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-01 10:04 -0700
                Re: Wikipedia Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-06-07 08:28 -0700
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 21:22 +0200
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-01 13:43 -0700
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-02 10:07 +0200
                Re: Wikipedia Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-06-07 08:21 -0700
                Re: Wikipedia "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-06-10 07:18 -0700
              Re: Wikipedia muttley@dastardlyhq.com - 2022-05-31 18:34 +0000
                Re: Wikipedia Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-05-31 19:37 +0100
                Re: Wikipedia muttley@dastardlyhq.com - 2022-05-31 18:42 +0000
                Re: Wikipedia Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-05-31 20:00 +0100
                Re: Wikipedia muttley@dastardlyhq.com - 2022-05-31 19:19 +0000
                Re: Wikipedia Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-05-31 20:28 +0100
                Re: Wikipedia muttley@dastardlyhq.com - 2022-06-01 18:07 +0000
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 20:28 +0200
                Re: Wikipedia scott@slp53.sl.home (Scott Lurndal) - 2022-05-31 19:37 +0000
                Re: Wikipedia Vir Campestris <vir.campestris@invalid.invalid> - 2022-05-31 21:27 +0100
                Re: "std::" (was: Wikipedia) Mr Flibble <flibble@reddwarf.jmc.corp> - 2022-05-31 21:17 +0100
                Re: "std::" (was: Wikipedia) Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 06:33 +0200
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 09:34 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 05:40 +0200
      Re: Wikipedia Manu Raju <MR@invalid.invalid> - 2022-05-31 17:18 +0100
        Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-31 18:25 +0200
          Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 09:38 +0200
            Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 09:46 +0200
              Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 10:16 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 10:21 +0200
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 17:13 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 17:15 +0200
                Re: Wikipedia David Brown <david.brown@hesbynett.no> - 2022-06-01 18:12 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 18:18 +0200
                Re: Wikipedia Bonita Montero <Bonita.Montero@gmail.com> - 2022-06-01 18:39 +0200

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