Re: error trapping
In article <199910191740.NAA20238@l...>, John Cowan <cowan@l...> writes > >It is no accident that C++ and Java have termination semantics only >for their exceptions. Unfortunately I cannot find a citation to this >story, but it is instructive. > The Design and Evolution of C++ Bjarne Stroustrup, published by Addison Wesley, ISBN 0-201-54330-3 Section 16.6, P.390-393 in my copy There is also a two-line summary of Cedar/Mesa experience, which was apparently repeated in two large IBM projects, and was supported by many others: termination is preferred over resumption; this is not a matter of opinion but a matter of years of experience. Resumption is seductive, but not valid. The suggested alternative to resumption makes most sense in the context of resource acquisition. Sacrificing rigor for brevity: while((resource = acquire()) != null) callback(); The callback should either release some more resource or throw a (terminating) exception, so you exit the loop either normally, with the resource, or via the exception. I was amused by the following section: ... Martin O'Riordan reported that "Microsoft had several years of positive experience with resumable exception handling", but the absence of specific examples and doubts about the value of OS/2 Release 1 as a proof of technical soundness weakened his case. I have no experience of OS/2 Release anything, and so cannot comment. Perhaps somebody out there can tell us if later releases evolved away from resumable exceptions. -- A. G. McDowell xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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