<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 - "too many template arguments for class template" disallows sensible empty-parameter-pack instantiation"
href="https://bugs.llvm.org/show_bug.cgi?id=38431">bug 38431</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;">CC</td>
<td>
</td>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - "too many template arguments for class template" disallows sensible empty-parameter-pack instantiation"
href="https://bugs.llvm.org/show_bug.cgi?id=38431#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - "too many template arguments for class template" disallows sensible empty-parameter-pack instantiation"
href="https://bugs.llvm.org/show_bug.cgi?id=38431">bug 38431</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>(In reply to tonyelewis from <a href="show_bug.cgi?id=38431#c0">comment #0</a>)
<span class="quote">> I'm guessing that this
> code is valid because f() and A can be reasonably instantiated with an empty
> parameter pack</span >
Your guess turns out to be incorrect. See <a href="http://eel.is/c++draft/temp#res-8.3">http://eel.is/c++draft/temp#res-8.3</a>:
"The program is ill-formed, no diagnostic required, if [...] every valid
specialization of a variadic template requires an empty template parameter
pack"
So Clang is correct to diagnose this. (And the other compilers are correct to
accept it if they so choose.)</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>