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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Trailing decltype in variadic function with explicitly specified template parameters fails"
href="http://llvm.org/bugs/show_bug.cgi?id=21446">21446</a>
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<th>Summary</th>
<td>Trailing decltype in variadic function with explicitly specified template parameters fails
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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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>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>eniebler@boost.org
</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>This code fails to compile:
template<typename...Us>
void boinc(Us...us)
{}
template<typename ... Us>
auto foo(Us...us) -> decltype(boinc(((Us)us)...))
{
}
int main()
{
foo<int, int, int>(0,0,0);
}
The error I get is:
test.cpp:13:5: error: no matching function for call to 'foo'
foo<int, int, int>(0,0,0);
^~~~~~~~~~~~~~~~~~
test.cpp:7:6: note: candidate template ignored: substitution failure
[with Us = <int, int, int>]: pack expansion contains parameter packs 'Us'
and 'us' that have different lengths (3 vs. 4)
auto foo(Us...us) -> decltype(boinc(((Us)us)...))
^ ~~~
1 error generated.
This is obviously bogus.</pre>
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</p>
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