<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 - Clang compiler failed with error: no matching member function for call to 'f'"
href="https://bugs.llvm.org/show_bug.cgi?id=39180">bug 39180</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 - Clang compiler failed with error: no matching member function for call to 'f'"
href="https://bugs.llvm.org/show_bug.cgi?id=39180#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang compiler failed with error: no matching member function for call to 'f'"
href="https://bugs.llvm.org/show_bug.cgi?id=39180">bug 39180</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>MSVC is wrong to accept this. The instantiation of Tuple_<char, int> looks
approximately like this:
template<> struct Tuple_<char, int> {
template<char T$1, int T$2> int f() {
return 2;
}
};
so f() can only be called with two template arguments.
More formally, the relevant rule is [temp.variadic]/7: "All of the packs
expanded by a pack expansion shall have the same number of arguments
specified."
"Types ...T" is a pack expansion, and the packs "Types" and "T" have different
numbers of arguments, so this code is invalid.
FWIW, EDG also rejects this code, but GCC seems to have a similar bug to MSVC.
If this occurs in a prominent MS header for which compatibility is important,
we can consider adding a workaround to Clang to support that usage; please
reopen in that case.</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>