Re: What is visitor pattern?

From	Bonita Montero <Bonita.Montero@gmail.com>
Newsgroups	comp.lang.c++
Subject	Re: What is visitor pattern?
Date	2023-08-26 09:24 +0200
Organization	A noiseless patient Spider
Message-ID	<ucc9bg$g167$1@dont-email.me> (permalink)
References	(7 earlier) <niCFM.897824$GMN3.379171@fx16.iad> <uc703b$3cer6$1@dont-email.me> <gcSFM.312013$Fgta.22420@fx10.iad> <uc9696$3rp9i$1@dont-email.me> <2KfGM.827216$TPw2.761320@fx17.iad>

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Am 26.08.2023 um 07:05 schrieb Pavel:

> Visitor does not need anything, it simply solves a particular class
> of  problems that happens to include a structure of objects of multiple 
> types. Your visitor implementation is invalid if it cannot solve a valid 
> visitor problem.

Either I didn't describe the difference to what you imagine correctly
or you just didn't understand me. In the Visitor pattern, the Visitor
needs a base class with a virtual method to derive from, and the derived
object is passed by reference to the Visitor function of the objects
being visited. However, the derived and the base class are superfluous
with functional programming. Since C++11 you can simply request a
function<> object and conveniently you just pass a lambda that when
called, a temporary function<> object is created that represents the
interface to the object that can be visited.

Thread

What is visitor pattern? wij <wyniijj5@gmail.com> - 2023-08-20 06:55 -0700
  Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-20 07:22 -0700
    Re: What is visitor pattern? wij <wyniijj5@gmail.com> - 2023-08-20 19:24 -0700
    Re: What is visitor pattern? wij <wyniijj5@gmail.com> - 2023-08-27 13:13 -0700
      Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-28 00:13 -0700
        Re: What is visitor pattern? wij <wyniijj5@gmail.com> - 2023-08-28 23:18 -0700
  Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-20 14:12 -0400
    Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-20 13:34 -0700
      Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-20 18:01 -0400
        Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-20 21:12 -0700
          Re: What is visitor pattern? Muttley@dastardlyhq.com - 2023-08-21 06:53 +0000
            Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-21 00:10 -0700
              Re: What is visitor pattern? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2023-08-26 21:26 -0700
                Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-26 22:57 -0700
                Re: What is visitor pattern? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2023-08-28 15:07 -0700
          Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-21 22:55 -0400
            Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-21 21:56 -0700
              Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-24 01:38 -0400
                Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-24 04:45 -0700
                Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-24 23:11 -0400
                Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-25 07:52 -0700
                Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-26 00:55 -0400
    Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-21 06:18 +0200
      Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-21 23:28 -0400
        Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-22 05:47 +0200
          Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-22 00:11 -0400
            Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-22 14:30 +0200
              Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-24 01:56 -0400
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-24 09:15 +0200
                Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-24 20:02 -0400
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-25 05:13 +0200
                Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-26 01:05 -0400
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-26 09:24 +0200
                Re: What is visitor pattern? Muttley@dastardlyhq.com - 2023-08-26 08:01 +0000
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-26 11:29 +0200
                Re: What is visitor pattern? Muttley@dastardlyhq.com - 2023-08-26 15:00 +0000
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-26 17:08 +0200
                Re: What is visitor pattern? Muttley@dastardlyhq.com - 2023-08-26 15:15 +0000
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-26 17:24 +0200
                Re: What is visitor pattern? Muttley@dastardlyhq.com - 2023-08-26 15:36 +0000
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-26 17:39 +0200
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-26 17:26 +0200
                Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-29 21:44 -0400
                Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-29 22:14 -0400
                Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-30 06:13 +0200
                Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-30 23:18 -0400
  Re: What is visitor pattern? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2023-08-21 01:17 +0200
    Re: What is visitor pattern? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2023-08-21 01:24 +0200
  Re: What is visitor pattern? Michael S <already5chosen@yahoo.com> - 2023-08-25 05:21 -0700
    Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-25 14:33 +0200
    Re: What is visitor pattern? Öö Tiib <ootiib@hot.ee> - 2023-08-25 08:28 -0700
    Re: What is visitor pattern? Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2023-08-26 01:17 -0400
  Re: What is visitor pattern? Bonita Montero <Bonita.Montero@gmail.com> - 2023-08-29 19:27 +0200

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