Article View: comp.std.c++
Article #2671Re: Exceptions in derived class destructors
From: Dick Menninger
Date: Wed, 22 Nov 1995 02:41
Date: Wed, 22 Nov 1995 02:41
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> ==========John Max Skaller, 11/20/95========== > What's more, the committee has taken special pains to > add an extensions late in the process to ensure > memory can be deallocated correctly if a constructor > invoked by a new expression fails. So called "placement > delete" now exists to enable leak proof programs > to be written. In addition, there is a flag for checking > if there is a current unhandled exception, for the > same reason -- so you can avoid throwing an exception > (which would otherwise cause immediate termination, > not a suitable action in some embedded or > continuously running systems). Such a flag can be of limited help, given the current rules about only one exception at a time. But that is a bandaid rather than a real solution to the fact that multiple exceptional conditions do, in practice, overlap in the real world situations. When you allow only one, the first one to go off is it and you either completely suppress the other exceptions which may be more serious and need different handling at each catch level, or you must do your own real mechanism that records the real world multi-exception track behind the exception mechanism's back while using one exception as a token to get the frames and catch layers unfolded. That may require you to encase "outside" stuff to convert to your scheme. Has anyone gone this route to an extent that would provide useful fodder for the standard, or am I likely to forge new paths if I get the kind of work I speculate may be in the offing in the near future (I am a trailing spouse and am about to find myself in a new situation)? Good Day Dick Dick.Menninger@DaytonOH.ATTGIS.COM --- [ comp.std.c++ is moderated. Submission address: std-c++@ncar.ucar.edu. Contact address: std-c++-request@ncar.ucar.edu. The moderation policy is summarized in http://dogbert.lbl.gov/~matt/std-c++/policy.html. ]
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Path: arc1-ca.pugleaf.net!in2.uu.net!bounce-back Date: 22 Nov 95 02:41:35 GMT Approved: fjh@cs.mu.oz.au Newsgroups: comp.std.c++ From: Dick Menninger <Dick.Menninger@daytonoh.attgis.com> Subject: Re: Exceptions in derived class destructors Message-ID: <DIEv91.EDo@falcon.daytonoh.attgis.com> Reply-To: mennid <Dick.Menninger@daytonoh.attgis.com> Organization: AT&T Global Information Solutions X-Newsreader: DiscussIT 2.5.1.3 for MS Windows [AT&T Software Products Division] References: <48qgr8$i2v@oznet03.ozemail.com.au> X-Original-Date: Tue, 21 Nov 1995 20:51:01 GMT X-Auth: PGPMoose V1.1 PGP comp.std.c++ iQBFAgUBMLKN7OEDnX0m9pzZAQHlrQGAnIaMxiPx+9PfoVmKZqznkJontDzW8n/4 zR0lGLPSl9YhjUs/tzjbRLKNmwSkuVIV =kp+L