<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - templetized operator<< isn't matched in a namespace"
href="https://bugs.llvm.org/show_bug.cgi?id=47333">bug 47333</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - templetized operator<< isn't matched in a namespace"
href="https://bugs.llvm.org/show_bug.cgi?id=47333#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - templetized operator<< isn't matched in a namespace"
href="https://bugs.llvm.org/show_bug.cgi?id=47333">bug 47333</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>This is just how C++ operator lookup works, I'm afraid. It's not designed to
let you customise the behavior of an operator on types that you don't control.
The operator in `os << ee` is looked up as if it were written `operator<<(os,
ee)`. That lookup performs two checks:
1) What can we find by unqualified lookup? That is, search outwards through
scopes until you find a declaration of `operator<<` and stop there. This finds
the declaration in the namespace if present, and finds the declaration at
global scope otherwise.
2) Perform argument-dependent lookup: this looks for any `operator<<` declared
in a namespace associated with any argument (in this case, that's only
namespace `std`) and look for hidden friends of classes involved in the
argument types.
Neither lookup finds your ::operator<< when X::operator<< is declared.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>