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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 --- - Warn when a template class declares a dependent friend function [-Wnon-template-friend]"
href="https://llvm.org/bugs/show_bug.cgi?id=23342">23342</a>
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<th>Summary</th>
<td>Warn when a template class declares a dependent friend function [-Wnon-template-friend]
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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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>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The out-of-line friend declaration is very likely broken because the
declaration is not part of the template. GCC has a -Wnon-template-friend
warning that finds this.
template <typename T>
struct Arg {
friend bool operator==(const Arg& lhs, T rhs) {
return false;
}
friend bool operator!=(const Arg& lhs, T rhs);
};
template <typename T>
bool operator!=(const Arg<T>& lhs, T rhs) {
return true;
}
bool foo() {
Arg<int> arg;
return (arg == 42) || (arg != 42);
}</pre>
</div>
</p>
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