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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - unable to pass types from vairadic-template-function to templated argument(s)"
href="https://llvm.org/bugs/show_bug.cgi?id=25695">25695</a>
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<th>Summary</th>
<td>unable to pass types from vairadic-template-function to templated argument(s)
</td>
</tr>
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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>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>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm@adaptivetime.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>if you have a variadic template type (see type "deeper") and pass it as a
template argument to s variadic template function (see function "shallow") then
clang will be unable to use it, even without having to deduce it's type.
=== CODE ===
template<typename... ArgTypes>
using deeper = void(*)(ArgTypes...);
template<typename... ArgTypes>
void shallow(deeper<ArgTypes...> arg) { }
int main(int argc, char* argv[])
{
deeper<int> arg;
shallow<int>(arg);
return 0;
}
=== ERRORS ===
$ clang++ -std=c++14 broken.cpp -o broke
broken.cpp:10:3: error: no matching function for call to 'shallow'
shallow<int>(arg);
^~~~~~~~~~~~
broken.cpp:5:6: note: candidate template ignored: failed template argument
deduction
void shallow(deeper<ArgTypes...> arg) { }
^
1 error generated.</pre>
</div>
</p>
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