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Groups > comp.lang.c++ > #84408

Re: Wikipedia

From David Brown <david.brown@hesbynett.no>
Newsgroups comp.lang.c++
Subject Re: Wikipedia
Date 2022-06-01 09:26 +0200
Organization A noiseless patient Spider
Message-ID <t774b9$9r0$1@dont-email.me> (permalink)
References (3 earlier) <t754dt$d4g$1@dont-email.me> <20220531180032.000018e7@reddwarf.jmc.corp> <t75htr$rl8$1@dont-email.me> <20220531184340.000065fe@reddwarf.jmc.corp> <t75kc4$emq$1@dont-email.me>

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On 31/05/2022 19:48, Bonita Montero wrote:
>> It isn't a coding style: you are abusing namespaces by actually
>> going against their intended purpose. ...
> 
> That's not true. The C++ Coding Guidelines encourage to use
> "using namespace std" because the guidelines assume, that
> developers are familiar with the names under std::.
> And the reasons you give are pure pseudo-reasons to dictate
> your personal taste - because you and others have a mental
> problem to tend to a feeling of uncertainty.

The whole point of having standard library names in the "std::" 
namespace is that new versions of C++ can have more functions, classes 
and other identifiers added to /their/ namespace without conflicting 
with user code.

This means you could have written some code that was tested with C++14, 
and had your own class "optional".  When C++17 came out, people could 
compile it with a C++17 compiler without conflict - because the new 
standard library "optional" class is in the "std::" namespace and there 
is no conflict.

This is what allows the C++ standards folk to introduce new identifiers 
with convenient names, without reserving wide ranges of identifiers or 
using obscure and unpronounceable names as must be done in the C standards.


A global "using namespace std;" defeats that - it is shooting yourself 
in the foot and guaranteeing that your code will bit-rot and be unusable 
in the future, for no benefit.


As far as I can see, "using namespace std;" at file scope has only one 
good use - for converting old pre-"std::" code to work with newer 
standards with minimal textual changes.


For your own code, you can write things any way you want.  For code to 
be shown to or used by others, you should write in the clearest and most 
portable way you can - and that includes portable across time and 
standards versions, and being explicit about namespaces.

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Thread

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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