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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Fails deduction of parameter pack for pack of function parameter types"
href="https://llvm.org/bugs/show_bug.cgi?id=30236">30236</a>
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<tr>
<th>Summary</th>
<td>Fails deduction of parameter pack for pack of function parameter types
</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>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++14
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>r.hl@gmx.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>template <typename... T>
void f( void(...t)(T) );
template <typename... T>
void g( void(t)(T) );
int main() {
void h(int);
f(h); // Error
g(h); // Ok?
}
This seems inconsistent, because the deduction of the pack T in the call to f
is done by performing deduction of void(T) against void(int), that is, the
deduction step necessary for the call to g (which succeeds).
The error message suggests that deduction is performed with the decayed type of
'g':
> could not match 'void (T)' against 'void (*)(int)'
Presumably it would succeed if A is left as 'void(int)'.</pre>
</div>
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