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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Iterator overrun in std::unique"
href="http://llvm.org/bugs/show_bug.cgi?id=18786">18786</a>
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<th>Summary</th>
<td>Iterator overrun in std::unique
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>hhinnant@apple.com
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<th>Reporter</th>
<td>eric@boostpro.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Hi Howard. Forgive me, maybe this is just because I haven't had my morning
coffee yet, but I'm looking at the implementation of std::unique, and I see
this:
if (__first != __last)
{
// ... a a ? ...
// f i
_ForwardIterator __i = __first;
for (++__i; ++__i != __last;)
if (!__pred(*__first, *__i))
*++__first = _VSTD::move(*__i);
++__first;
}
Now image __first and __last delimit a sequence of exactly one element. __first
!= __last is true, __i is assigned begin, is incremented once (so now it equals
__last), and is then incremented *again* before comparing it to last. This
looks like a bug to me.</pre>
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