RTTI for distribution

This is a discussion on RTTI for distribution within the C++ Programming forums, part of the General Programming Boards category; Which of the following statements provide a valid reason not to use RTTI for distributed (i.e. networked between different platforms) ...

  1. #1
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    RTTI for distribution

    Which of the following statements provide a valid reason not to use RTTI for distributed (i.e. networked between different platforms) applications in C++?

    A. RTTI is too slow.
    B. RTTI uses too much memory.
    C. RTTI does not have standardized run-time behavior.
    D. RTTI's performance is unpredictable/non-deterministic.
    E. RTTI frequently fails to function correctly at run-time.

    Ok, in terms of not using RTTI for distribution, I'm completely unsure. Maybe D (but that is just a guess). I don't think it would be E, because to my knowledge the point of RTTI is to improve function at run-time. I'm rather sure A, B are correct for RTTI, but not a good reason why not to use RTTI for distribution. Could someone point me to some good links on this, and/or comment on my thoughts. As I can't find much about the reasons not to use RTTI (for distribution, in particular).

    Thx.
    "What comes around, goes around"

  2. #2
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    I'd say the best answer is that it's too slow, but I've also seen some RTTI functions work unpredictably also. The only one I trust is dynamic_cast.
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

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  3. #3
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    There is absolutely no reason not to use RTTI in distributed programs.

    However, there is a reason not to use RTTI information in distribution itself: the format of the information (the only information you can get anyway is type_info::name()) is not standardized, so you cannot rely on it across compilers. In other words, you can't take type_info::name() on one node, send the result to another, and expect it to match type_info::name() of any type on that node.
    But then, RTTI doesn't provide a means of dynamic instantiation anyway.
    All the buzzt!
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  4. #4
    and the hat of wrongness Salem's Avatar
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    You seem to be asking a lot of quiz questions (select x from the following 5 options).

    exception in the destructor
    C/C++ preprocessor directives
    implementing a polymorphic function in C++
    virtual destructors
    using new
    terminate() function
    unary operator overloading and classes
    3 consecutive posts doesn't look good (it looks like a homework dump).

    Showing that you know the answers is one thing.
    Showing that you can use the information in a practical setting is another.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Re: Rtti

    This question is exact word-for-word that I had recently at an on-line test I took while applying for a job
    Too bad I didn't use google while taking the test
    I believe that C is the correct answer

    Thanks

  6. #6
    a_capitalist_story
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    Thanks for letting us know, binaryman. Wonder if he got the job?

  7. #7
    and the hat of wrongness Salem's Avatar
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    Yeah, shame you didn't read this before wading in with the "me too" post far too late to be of any use to anyone.
    C Board - Announcements in Forum : C++ Programming
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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