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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SFINAE/std::enable_if non-failure in empty variadic parameter declaration"
href="http://llvm.org/bugs/show_bug.cgi?id=18677">18677</a>
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<th>Summary</th>
<td>SFINAE/std::enable_if non-failure in empty variadic parameter declaration
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.4
</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>
</tr>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>pab@pabigot.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11982" name="attach_11982" title="Standalone test case demonstrating issue">attachment 11982</a> <a href="attachment.cgi?id=11982&action=edit" title="Standalone test case demonstrating issue">[details]</a></span>
Standalone test case demonstrating issue
Attempting to understand why the example at the end of
<a href="http://flamingdangerzone.com/cxx11/2013/03/11/overload-ranking.html">http://flamingdangerzone.com/cxx11/2013/03/11/overload-ranking.html</a> fails to
work on clang 3.4 I reduced the problem to the attached program. It shows that
use of:
template <unsigned N, typename std::enable_if<N!=2>::type...>
int overloaded (B) { return 2; }
fails to disable the overload when N==2. With the alternative syntax:
template <unsigned N, typename = typename std::enable_if<N!=2>::type>
int overloaded (B) { return 2; }
the overload is correctly disabled.</pre>
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