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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 --- - Template argument deduction for base class fails"
href="https://llvm.org/bugs/show_bug.cgi?id=27155">27155</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Template argument deduction for base class fails
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<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++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>roman.perepelitsa@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>struct B {};
template <class T, int>
struct D : T {};
template <class T>
void Foo(D<T, 0>);
int main() {
Foo(D<D<B, 0>, 1>());
}
Clang erroneously rejects this code:
10 : error: no matching function for call to 'Foo'
Foo(D<D<B, 0>, 1>());
^~~
7 : note: candidate template ignored: could not match 0 against 1
void Foo(D<T, 0>);
^
However, it accepts this very similar code:
template <class T, int>
struct S {};
template <class T>
struct S<T, 1> : S<T, 0> {};
template <class T>
void Foo(S<T, 0>);
int main() {
Foo(S<void, 1>());
}</pre>
</div>
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