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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [C++11] The template parameter pack of a function template should be the last template parameter"
href="http://llvm.org/bugs/show_bug.cgi?id=20482">20482</a>
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<th>Summary</th>
<td>[C++11] The template parameter pack of a function template should be the last template parameter
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++11
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kariya_mitsuru@hotmail.com
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>The both sample codes below should cause compilation error but they are
compiled successfully by clang.
==============================================
template<class... T, class... U> void f() { }
==============================================
===========================================
template<class... T, class U> void g() { }
===========================================
According to C++11 standard 14.1 Template parameters [temp.param] paragraph 11,
"A template parameter pack of a function template shall not be followed by
another template parameter unless that template parameter can be deduced from
the parameter-type-list of the function template or has a default argument."
The latest draft is more clarified using the following example.
=======================================================================
// U can be neither deduced from the parameter-type-list nor specified
template<class... T, class... U> void f() { } // error
template<class... T, class U> void g() { } // error
=======================================================================
cf. <a href="http://melpon.org/wandbox/permlink/7Xl64RRorrf0L1vR">http://melpon.org/wandbox/permlink/7Xl64RRorrf0L1vR</a></pre>
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