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

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On 11/16/2011 11:14 AM, Chris Stankevitz wrote:
> On Nov 16, 10:52 am, Ian Collins<ian-n...@hotmail.com>  wrote:
>> Something like:
>>
>> struct Shape {
>>     virtual void write() = 0;};
>
> Ian,
>
> I prefer/require a solution in which the shapes themselves are not
> writing out XML -- I want the XML related code restricted to the
> "XmlWriter" class in "Library B".  This appears to be an overly
> draconian requirement in this simple example, but should make more
> sense if you consider adding something like a "drawing" or "network"
> class that would introduce dependencies on drawing or socket code.
>
> I want drawing/xml/socket code relegated to "Library B" without
> compile or link dependencies in "Library A".
>


You are somewhat correct here.  Have the "write" function return
a string which the XML code can display.  By divorcing the I/O from
the representation return, you're more general anyways.

BTW, what book are you reading?  This fragment/problem is actually
one of the canonical OOP examples.

class Shape {
public:
//...
virtual std::string as_string()  = 0;
}

class Square {
//...
std::string as_string() { return "Edge..." };
}

class

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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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