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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - std::vector + emplaced std::istringstream .seekg(0, std::ios_base::beg) leads to missize and trash at end of the stream .str()"
href="http://llvm.org/bugs/show_bug.cgi?id=15659">15659</a>
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<th>Summary</th>
<td>std::vector + emplaced std::istringstream .seekg(0, std::ios_base::beg) leads to missize and trash at end of the stream .str()
</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>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>release blocker
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>hhinnant@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>iamtakingiteasy@eientei.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10279" name="attach_10279" title="Example testcase">attachment 10279</a> <a href="attachment.cgi?id=10279&action=edit" title="Example testcase">[details]</a></span>
Example testcase
When std::istringstream emplaced into std::vector alongside with other
std::istringstream and then seeked to begening with .seekg(0,
std::ios_base::beg), it size becames largally bigger than original and end of
the stream filled with trash (probably, uninitalized or miss-accessed) data.
It is also known to work as expected on VC++ 2012.
The problem was reproduced with exact observed output by other person with
libc++.
Attaching a simple test-case; compiled with line
$ clang++ -std=c++11 -stdlib=libc++ tmp.cpp && ./a.out
Expected output:
3
MSG
3
31
hub started at [00 6b 8b 45 69]
31
Observed output:
3
MSG
3
31
hub started at [00 6b 8b 45 69]
593</pre>
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