Re: C++ exceptions are broken.

Message-ID	<nc9m4a$rbs$1@dont-email.me> (permalink)
Newsgroups	comp.lang.c++, comp.lang.c++.moderated
From	"Alf P. Steinbach" <alf.p.steinbach+usenet@googlemail.com>
Subject	Re: C++ exceptions are broken.
Organization	A noiseless patient Spider
References	(1 earlier) <20160308184714.bdb1e8f73fd1db86e9c83dc9@speakeasy.net> <NN-dnVoIWp4b-XnLnZ2dnUU7-WVj4p2d@giganews.com> <20160313124838.377cf0fcbce06a95bb9167ff@speakeasy.net> <87d1qy5aab.fsf@gmail.com> <dkqq5hFau71U1@mid.individual.net>
Date	2016-03-17 06:43 -0600

Cross-posted to 2 groups.

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On 15.03.2016 19:22, Bo Persson wrote:
>
> There is also a constructor
>
>      explicit logic_error(const char*);
>
> which doesn't have to call a string constructor.

Oh, it has to allocate memory dynamically for the string if it exceeds 
some buffer size, because there is no requirement that the actual 
argument points to a string that will outlive the exception object.

Most probably any particular implementation delegates the dynamic 
allocation job to `std::string`.

However, considering that `what` is virtual function that produces a 
`char const*`, it's not difficult at all to create a derived exception 
class that doesn't do dynamic allocation.

Cheers!,

- Alf

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C++ exceptions are broken. Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-03-08 06:31 -0600
  Re: C++ exceptions are broken. "James K. Lowden" <jklowden@speakeasy.net> - 2016-03-09 08:25 -0600
    Re: C++ exceptions are broken. Elias Salomão Helou Neto <eshneto@googlemail.com> - 2016-03-12 06:28 -0600
    Re: C++ exceptions are broken. Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-03-12 14:46 -0600
      Re: C++ exceptions are broken. Hergen Lehmann <hlehmann.expires.5-11@snafu.de> - 2016-03-12 16:50 -0600
      Re: C++ exceptions are broken. "James K. Lowden" <jklowden@speakeasy.net> - 2016-03-13 15:55 -0600
        Re: C++ exceptions are broken. Gareth Owen <gwowen@googlemail.com> - 2016-03-15 08:45 -0600
          Re: C++ exceptions are broken. Bo Persson <bop@gmb.dk> - 2016-03-15 12:22 -0600
            Re: C++ exceptions are broken. "Alf P. Steinbach" <alf.p.steinbach+usenet@googlemail.com> - 2016-03-17 06:43 -0600
            Re: C++ exceptions are broken. Paavo Helde <myfirstname@osa.pri.ee> - 2016-03-17 06:43 -0600
      Re: C++ exceptions are broken. Gareth Owen <gwowen@googlemail.com> - 2016-03-15 08:44 -0600

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