unexpected exception handler

This is a discussion on unexpected exception handler within the C++ Programming forums, part of the General Programming Boards category; Hello everyone, This question is about when it is allowed to call throw to re-throw exception -- make the exception ...

  1. #1
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    unexpected exception handler

    Hello everyone,


    This question is about when it is allowed to call throw to re-throw exception -- make the exception re-throw.

    I can only think of two situations,

    1. in catch block of an exception;
    2. in unexpected handler.

    For (2), in unexpected handler, since the input parameter is null, so in order to get the exception information, we need to re-throw it and catch it to get exception informaiton.

    Is my understanding correct? Here is some pseudo code from Bjarne's book.

    Code:
    // suppose throwY is unexpcted handler
    void throwY() throw (Yunexpected)
    {
        try{
            throw; // have to re-throw and catch in order to get exception information since current input parameter is null and has no exception information, my understanding correct?
        } catch (Network_exception& p)
        {
            throw (Yunexpected (&p));
        } catch (...)
        {
            throw (Yunexpected (0));
        }
    }

    thanks in advance,
    George

  2. #2
    Cat without Hat CornedBee's Avatar
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    since current input parameter is null
    There is no input parameter. Other than that, your understanding is correct.

    Note regarding both situations, however, that you may be arbitrarily far away from these positions, if you started there. I.e. you can call functions from within a catch block and rethrow there.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  3. #3
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    Thanks for your clarification, CornedBee!


    My question is answered.

    Quote Originally Posted by CornedBee View Post
    There is no input parameter. Other than that, your understanding is correct.

    Note regarding both situations, however, that you may be arbitrarily far away from these positions, if you started there. I.e. you can call functions from within a catch block and rethrow there.

    regards,
    George

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