<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang does not find partial specializations of a member template of a class template that are declared after the class template is instantiated"
href="http://llvm.org/bugs/show_bug.cgi?id=17294">17294</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang does not find partial specializations of a member template of a class template that are declared after the class template is instantiated
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Case 1, member class templates:
template<typename A> struct X { template<typename B> struct Y {}; };
X<int> x;
template<typename A> template<typename B> struct X<A>::Y<B*> { int n; };
int k = X<int>::Y<int*>().n;
We reject this, because line 2 triggers the instantiation of X<int>, and we
don't find partial specializations for the template that are declared after
that instantiation.
Case 2, static data member templates:
template<typename A> struct X { template<typename B> static const int n; };
X<int> x;
template<typename A> template<typename B> const int X<A>::n<B*> = 1;
int arr[X<int>::n<int*>];
We reject this for the same reason.
It's not *entirely* obvious that we're wrong here, because 14.5.5.3/2 says:
"if the enclosing class template is instantiated (14.7.1, 14.7.2), a
declaration for every member template partial specialization is also
instantiated as part of creating the members of the class template
specialization."
But g++ and EDG at least accept the member class templates 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>