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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 --- - friend keyword used on nested template class results in ignoring of the class specializations"
href="http://llvm.org/bugs/show_bug.cgi?id=22124">22124</a>
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<th>Summary</th>
<td>friend keyword used on nested template class results in ignoring of the class specializations
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>roman.kurc@wp.pl
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following example is compiled by g++ but causes clang compile error. It
seems that after using 'friend' on nested template class compiler ignores
possible class specializations.
.h
#pragma once
template< typename a >
struct friended
{
template < typename f, typename c >
struct inside ;
};
class A
{
public:
friend friended<A>::inside<A, int>;
int the_answer()
{
return 42;
}
};
template< typename a > template< typename b >
struct friended<a>::inside<A, b>
{
static int get_my_id( )
{
A ap;
return ap.the_answer();
}
};
.cpp
#include "template_test.h"
#include <iostream>
int main()
{
std::cout << friended<A>::inside<A,int>::get_my_id() << std::endl;
return 0;
}
for the above:
g++ -c -std=c++11 template_test.cpp - compiles just fine
clang++ -c -std=c++11 template_test.cpp gives
bash-4.1$ clang++ -c -std=c++11 template_test.cpp
template_test.cpp:6:31: error: implicit instantiation of undefined template
'friended<A>::inside<A, int>'
std::cout << friended<A>::inside<A,int>::get_my_id() << std::endl;
^
./template_test.h:12:12: note: template is declared here
struct inside ;
^
1 error generated.</pre>
</div>
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