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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - explicit specialization of 'instance' after instantiation"
href="http://llvm.org/bugs/show_bug.cgi?id=15739">15739</a>
</td>
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<tr>
<th>Summary</th>
<td>explicit specialization of 'instance' after instantiation
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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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>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>dimhen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>clang version 3.3 (trunk 179456)
$ /home/dimhen/build/csa/Release+Asserts/bin/clang++ -fsyntax-only
specialization.ii
specialization.ii:26:57: error: explicit specialization of 'instance' after
instantiation
0 > ChoiceValueTraitsT < DVCS_DigestInfo, 0 >::instance =
^
specialization.ii:22:39: note: implicit instantiation first required here
A::t_messageImprint >::instance;
^
specialization.ii:27:14: error: cannot refer to class template
'ChoiceValueTraitsT' without a template argument list
ChoiceValueTraitsT ();
^
specialization.ii:12:30: note: template is declared here
template < class, int >class ChoiceValueTraitsT:public B
^
2 errors generated.
$ cat specialization.ii
struct DVCS_DigestInfo;
class A
{
public:
enum Type
{ t_messageImprint };
}
;
class B
{
};
template < class, int >class ChoiceValueTraitsT:public B
{
public:
static const ChoiceValueTraitsT instance;
};
class C
{
const B *findTraits ()
{
return &ChoiceValueTraitsT < DVCS_DigestInfo,
A::t_messageImprint >::instance;
}
};
template <> const ChoiceValueTraitsT < DVCS_DigestInfo,
0 > ChoiceValueTraitsT < DVCS_DigestInfo, 0 >::instance =
ChoiceValueTraitsT ();
g++ (3.4.6, 4.7.2 and 4.9) compiles this code</pre>
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