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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Defaulted comparison operator with built-in type as member in same namespace as comparison operator template rejected"
href="https://bugs.llvm.org/show_bug.cgi?id=44721">44721</a>
</td>
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<th>Summary</th>
<td>Defaulted comparison operator with built-in type as member in same namespace as comparison operator template rejected
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david@doublewise.net
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>The following well-formed code:
```
namespace n {
template<typename T>
bool operator==(T const &, T const &) {
return true;
}
struct s {
friend bool operator==(s const &, s const &) = default;
int x;
};
}
```
is rejected by clang with the following message:
```
main.cpp:4:6: error: overloaded 'operator==' must have at least one parameter
of class or enumeration type
bool operator==(T const &, T const &) {
^
main.cpp:9:14: note: in instantiation of function template specialization
'n::operator==<int>' requested here
friend bool operator==(s const &, s const &) = default;
^
1 error generated.
```
A similar error occurs for `operator<=>`. This occurs only when the comparison
operator is defaulted. Manually writing out the equivalent definition is fine.
(In the real code, the generic `operator==` is constrained with a concept that
would not match any built-in type)</pre>
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