[Bug libstdc++/30416] SIGSEGV in valarray::cshift(n) on empty array

[sebor at roguewave dot com]

------- 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.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30416