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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - is_same<const const char*, const char*>::value == false"
href="https://llvm.org/bugs/show_bug.cgi?id=26109">26109</a>
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<th>Summary</th>
<td>is_same<const const char*, const char*>::value == false
</td>
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<th>Product</th>
<td>libc++
</td>
</tr>
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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>Linux
</td>
</tr>
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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
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>dan.eloff@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I'm using libc++ from the trusty/universe repo:
libc++1_1.0~svn199600-1_amd64.deb
is_same is used by unordered_map in a static assert to check that the
allocator::value_type is the same as the map value_type. The problem is the map
defines value_type as pair<const Key, Value>. If Key was already a const type
(const char *) in this case, somehow it gets double const qualified and is_same
fails. If however, I make a typedef of const char* as CString and then define
the allocator type as pair<const CString, Value> the is_same check passes.
This seems like a bug to me, double const qualifiers should be ignored by
is_same, right? I'm not sure what other compilers do.
I hope I reported the bug in the right place, it could well be clang issue.</pre>
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