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Re: How can I remove dynamic_cast and if statements from this code snippet?

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On 11/17/11 10:41 AM, Chris Stankevitz wrote:
> On Nov 16, 1:37 pm, Ian Collins<ian-n...@hotmail.com>  wrote:
>> Well you have to look seriously at whether a shape knows how to write
>> its self, or an XmlWriter knows how to write a shape.  If it's the
>> latter, you have to provide a means for an XmlWriter to access the
>> required information.
>
> Yes, it is the latter that I would like to do.
>
>>   This can lead to significant complexity
>
> Yes, I am looking for complexity and am curious if it is possible to
> do this with c++.
>
>> It gets more complex still if you consider drawing a shape.
>
> Yes, I am trying to draw Shapes without Shapes knowing how to draw
> themselves.  Is it possible to do this in c++ without using
> dynamic_cast or lots of switch/if statements?

The problem has little to do with C++.  The issue of who knows how to do 
what is common to any language.

The literal answer to your question is yes.  You can always replace 
conditionals with virtual member functions.

-- 
Ian Collins

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How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-16 10:37 -0800
  Re: How can I remove dynamic_cast and if statements from this code snippet? Ian Collins <ian-news@hotmail.com> - 2011-11-17 07:52 +1300
    Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-16 11:14 -0800
      Re: How can I remove dynamic_cast and if statements from this code snippet? red floyd <no.spam.here@its.invalid> - 2011-11-16 12:03 -0800
        Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-16 13:28 -0800
          Re: How can I remove dynamic_cast and if statements from this code snippet? Leigh Johnston <leigh@i42.co.uk> - 2011-11-16 21:39 +0000
            Re: How can I remove dynamic_cast and if statements from this code snippet? Leigh Johnston <leigh@i42.co.uk> - 2011-11-16 21:40 +0000
              Re: How can I remove dynamic_cast and if statements from this code snippet? Leigh Johnston <leigh@i42.co.uk> - 2011-11-16 21:43 +0000
                Re: How can I remove dynamic_cast and if statements from this code snippet? Leigh Johnston <leigh@i42.co.uk> - 2011-11-16 21:45 +0000
            Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-16 13:46 -0800
              Re: How can I remove dynamic_cast and if statements from this code snippet? Leigh Johnston <leigh@i42.co.uk> - 2011-11-16 21:49 +0000
      Re: How can I remove dynamic_cast and if statements from this code snippet? Leigh Johnston <leigh@i42.co.uk> - 2011-11-16 20:35 +0000
        Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-16 13:38 -0800
      Re: How can I remove dynamic_cast and if statements from this code snippet? Ian Collins <ian-news@hotmail.com> - 2011-11-17 10:37 +1300
        Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-16 13:41 -0800
          Re: How can I remove dynamic_cast and if statements from this code snippet? Ian Collins <ian-news@hotmail.com> - 2011-11-17 10:56 +1300
            Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-16 14:03 -0800
              Re: How can I remove dynamic_cast and if statements from this code snippet? Ian Collins <ian-news@hotmail.com> - 2011-11-17 11:12 +1300
                Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-16 15:20 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Werner <werasm@gmail.com> - 2011-11-16 23:39 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Goran <goran.pusic@gmail.com> - 2011-11-17 05:42 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-17 10:37 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Werner <werasm@gmail.com> - 2011-11-17 23:23 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Goran <goran.pusic@gmail.com> - 2011-11-18 01:46 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Goran <goran.pusic@gmail.com> - 2011-11-18 01:25 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Werner <werasm@gmail.com> - 2011-11-17 23:28 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-17 10:27 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Goran <goran.pusic@gmail.com> - 2011-11-17 05:17 -0800
                Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-17 10:35 -0800
  Re: How can I remove dynamic_cast and if statements from this code snippet? Francesco <xtrigger303@gmail.com> - 2011-11-17 01:56 -0800
    Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-17 10:31 -0800
  Re: How can I remove dynamic_cast and if statements from this code snippet? <address_is@invalid.invalid> - 2011-11-17 19:21 +0000
    Re: How can I remove dynamic_cast and if statements from this code snippet? Leigh Johnston <leigh@i42.co.uk> - 2011-11-17 19:33 +0000
    Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-17 14:09 -0800
      Re: How can I remove dynamic_cast and if statements from this code snippet? Werner <werasm@gmail.com> - 2011-11-17 23:30 -0800
        Re: How can I remove dynamic_cast and if statements from this code snippet? Bart v Ingen Schenau <bart@ingen.ddns.info> - 2011-11-18 14:45 +0100
    Re: How can I remove dynamic_cast and if statements from this code snippet? Goran <goran.pusic@gmail.com> - 2011-11-18 02:58 -0800
      Re: How can I remove dynamic_cast and if statements from this code snippet? Tobias Müller <troplin@bluewin.ch> - 2011-11-18 16:56 +0000
        Re: How can I remove dynamic_cast and if statements from this code snippet? Chris Stankevitz <chrisstankevitz@gmail.com> - 2011-11-18 17:27 -0800
    Re: How can I remove dynamic_cast and if statements from this code snippet? Goran <goran.pusic@gmail.com> - 2011-11-18 01:29 -0800
  Re: How can I remove dynamic_cast and if statements from this code snippet? Noah Roberts <roberts.noah@gmail.com> - 2011-11-18 09:23 -0800

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