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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::hash should not accept std::basic_strings with custom character traits"
href="https://bugs.llvm.org/show_bug.cgi?id=41876">41876</a>
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<th>Summary</th>
<td>std::hash should not accept std::basic_strings with custom character traits
</td>
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<th>Product</th>
<td>libc++
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>marc@groundctl.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
<div>
<pre>libc++ provides a specialization of std::hash that works for arbitrary
instantiations of std::basic_string. This can produce incorrect behavior for
basic_string instantiations with custom character traits that override equality
(e.g. traits for case-insensitive comparison). Since the standard only
requires that hash for for the typedefed instantiations (e.g. hash<string>,
hash<wstring>, etc), libc++ should not support hashing basic_strings with
custom character traits to avoid incorrect behavior.</pre>
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