Re: #pragma vtordisp in VC++

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From: Ralph (news.20.nt_consulting32_at_spamgourmet.com)
Date: 12/09/04 

Date: Thu, 9 Dec 2004 08:59:29 -0600

I was waiting for some guru to reply, as I have occasionally been curious myself.

Here is an interesting little article that suggests some reason for the option.
http://www.codeproject.com/cpp/FastDelegate.asp

However, I have one serious warning ...
I was perfectly happy with my simple working point-of-view that classes compiled into nice little "vtables" and that all compilers worked pretty much the same. If you have the same general world-view and don't want to destroy that pleasant illustion - don't read the article. <g>

-ralph

  "R. Green" <rgreen@inbox.ru> wrote in message news:%23qZbVaT3EHA.2676@TK2MSFTNGP12.phx.gbl...
  Hi,

  Could anybody explain in details about this pragma ? Or where can I read about it ?
  MS documentation is very poor:
  "If a derived class overrides a virtual function that it inherits from a virtual base class, and if a constructor or destructor for the derived class calls that function using a pointer to the virtual base class, the compiler may introduce additional hidden "vtordisp" fields into classes with virtual bases."

  WHY does the compiler need that fields ?

  Thanks.

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