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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang deduces conflicting types when using a "using template"-defined variadic function"
href="http://llvm.org/bugs/show_bug.cgi?id=19802">19802</a>
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<th>Summary</th>
<td>Clang deduces conflicting types when using a "using template"-defined variadic function
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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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>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dontbugme@mailinator.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12545" name="attach_12545" title="Failing test case">attachment 12545</a> <a href="attachment.cgi?id=12545&action=edit" title="Failing test case">[details]</a></span>
Failing test case
Instantiating a templated variadic function type incorrectly fails, for
example:
=============================================================
template<typename... Output>
using Func = void(Output*...);
=============================================================
Compiling the attached test case with 'clang++ --std=c++11 a.cc' (or indeed
c++1y) results in the following error message:
=============================================================
a.cc:21:3: error: no matching function for call to 'run_func'
run_func(f, &value);
^~~~~~~~
a.cc:9:6: note: candidate template ignored: deduced conflicting types for
parameter 'Output' ('double' vs. <double>)
void run_func(Func<Output...>& func, Output*... output) {
^
=============================================================
Using the function type directly, however, compiles as expected. That is
replacing the signature of run_func with:
=============================================================
template<typename... Output>
void run_func(void (&func)(Output*...), Output*... output) {
=============================================================</pre>
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