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Re: Where are the exception-objects allocated?

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On 13.11.2019 17:59, Bonita Montero wrote:
> Can anyone tell me what would be a proper way to allocate storage
> for an exception-object being thrown without causing that this
> allocation might fail? And remember that these objects even have
> to live longer than a thread because you might refer to it by
> an std::exception_ptr.

For string data you can leverage the internal special immutable string 
class by using `std::runtime_error` or a derived class.

It can of course throw when the original exception is created, but after 
that it's guaranteed that copying does not throw:

C++17 §21.8.2/2:
“Each standard library class T that derives from class exception shall 
have a publicly accessible copy constructor and a publicly accessible 
copy assignment operator that do not exit with an exception.”

For other data you have to ensure this guarantee yourself.

A reasonable approach is to minimize the amount of other data in an 
exception.


- Alf

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Where are the exception-objects allocated? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-13 17:59 +0100
  Re: Where are the exception-objects allocated? Öö Tiib <ootiib@hot.ee> - 2019-11-13 10:10 -0800
    Re: Where are the exception-objects allocated? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-13 19:14 +0100
      Re: Where are the exception-objects allocated? Öö Tiib <ootiib@hot.ee> - 2019-11-13 10:24 -0800
        Re: Where are the exception-objects allocated? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-13 19:27 +0100
          Re: Where are the exception-objects allocated? Öö Tiib <ootiib@hot.ee> - 2019-11-13 10:40 -0800
            Re: Where are the exception-objects allocated? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-13 19:44 +0100
              Re: Where are the exception-objects allocated? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-13 21:58 -0800
  Re: Where are the exception-objects allocated? James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-13 10:18 -0800
    Re: Where are the exception-objects allocated? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-13 19:28 +0100
      Re: Where are the exception-objects allocated? James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-13 10:44 -0800
        Re: Where are the exception-objects allocated? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-13 19:46 +0100
          Re: Where are the exception-objects allocated? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-13 20:06 +0100
          Re: Where are the exception-objects allocated? Öö Tiib <ootiib@hot.ee> - 2019-11-13 11:36 -0800
        Re: Where are the exception-objects allocated? scott@slp53.sl.home (Scott Lurndal) - 2019-11-13 19:41 +0000
          Re: Where are the exception-objects allocated? Ian Collins <ian-news@hotmail.com> - 2019-11-14 20:11 +1300
  Re: Where are the exception-objects allocated? "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-11-14 12:42 +0100
    Re: Where are the exception-objects allocated? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-14 13:07 +0100

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