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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - bitset ++operator generates invalid end"
href="http://llvm.org/bugs/show_bug.cgi?id=19663">19663</a>
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<th>Summary</th>
<td>bitset ++operator generates invalid end
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>Erik.Verbruggen@Me.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following program fails with an assertion:
#include <vector>
#include <cassert>
#include <algorithm>
int main()
{
std::vector<bool> bits;
bits.resize(6 * 64, false);
const size_t thePlace = 375;
const size_t start = thePlace + 1;
bits[thePlace] = true;
std::vector<bool>::iterator i = std::find(bits.begin() + start, bits.end(),
true);
assert(i == bits.end());
return i - bits.begin();
}
The expected result is that i should equal end(). It only fails when the bit
vector size is a whole multiple of the word size (64 bit for me).
Looking at i, what surprised me a bit is that __ctz_ (the bit in the word
pointed to) is 64, while for end() it's 0. I suspect that the ++operator
produces the wrong value for "the end" in this case.</pre>
</div>
</p>
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