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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 --- - SFINAE failure with variadic non-type template parameter" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23840&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=bY5sS6HqywhONRjbRKnmuXSMVIAlolEGj4QN5fbv2_A&s=MxVMmTwtCMpxNUjqwQdDJ4zGSNQcXcLuVi637dUCd6k&e=">23840</a>
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<th>Summary</th>
<td>SFINAE failure with variadic non-type template parameter
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.6
</td>
</tr>
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<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>
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<th>Reporter</th>
<td>avi@cloudius-systems.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The sample code:
====== begin sample =====
template <typename T>
struct x1 {
using type = int;
};
template <typename T>
struct x2 {
};
template <typename T, typename x1<T>::type...>
void f(T x) {
}
template <typename T, typename x2<T>::type...>
void f(T x) {
}
int main(int ac, char** av) {
f(1);
}
====== end sample ====
Does not compile, as clang does not reject the second overload of f(T), even
though x2<T>::type does not exist.
g++ compiles this. This error is particularly bad since it causes
std::experimental::optional<> from libstdc++ 5 not to build.</pre>
</div>
</p>
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