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[Bug libstdc++/30416] SIGSEGV in valarray::cshift(n) on empty array
- From: "sebor at roguewave dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 9 Jan 2007 22:34:49 -0000
- Subject: [Bug libstdc++/30416] SIGSEGV in valarray::cshift(n) on empty array
- References: <bug-30416-1186@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from sebor at roguewave dot com 2007-01-09 22:34 -------
(In reply to comment #3)
> The standard refers to "(l+n)%size()", so if size()=0, that seems to be
> undefined. On the other hand, it seems fairly obvious what should happen in
> this case (ie nothing).
The requirement is to "return an object of length size() each of whose
elements..." If there are no elements the "..." doesn't/cannot apply. Note
that an analogous expression is used in rotate_copy which I assume we all
agree is well defined for zero-length ranges.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30416