From 6283754607351123103 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,9723061da44e5214 X-Google-Attributes: gidf78e5,public From: sbnaran@uiuc.edu (Siemel B. Naran) Subject: Re: Exception while throwing an exception? Date: 1999/09/08 Message-ID: #1/1 X-Deja-AN: 522607734 X-NNTP-Posting-Host: rochester-26.slip.uiuc.edu Approved: stephen.clamage@sun.com (comp.std.c++) References: <37D3E50E.A13D8AFC@prodigy.net> <37D56411.F9600F29@ibm.net> X-UID: 0000000001 X-Status: $$$T Organization: University of Illinois at Urbana-Champaign User-Agent: slrn/0.9.5.7 (UNIX) Reply-To: sbnaran@uiuc.edu Newsgroups: comp.std.c++ Originator: clamage@taumet On 7 Sep 1999 19:53:57 GMT, Biju Thomas wrote: >Siemel B. Naran wrote: >> On 6 Sep 1999 20:53:57 GMT, Andy Larson wrote: >>>What is the required behavior when the constructor of an exception >>>object throws an exception? For example, if an exception is thrown as >> The required behaviour is a call to std::terminate(). > >I can't find such a specification in the standard. Can you tell where >you found it? I went by logic, because I don't know where in the standard to look for the answer, and I should have said this. Here is my reasoning: the "throw E()" begins a throw process. As E::E() throws an exception, we have two exceptions in the picture. So the result is a call to std::terminate. But after reading the other replies, as well as a private email from a concerned C++ citizen, I think that my reasoning is wrong. Consider the following: { E e; throw e; } // version 1 It is obviously equivalent to { throw E(); } // version 2 Now in version 1, if E::E() throws an exception, say an exception of type T, then it is this T exception-object that leaves the block. As version 2 is equivalent to version 1, it is the exception of E::E() or T that leaves the block. The throw process only begins after the system has created the E object, as another replier said. -- -------------- siemel b naran -------------- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html ]