[LLVMbugs] [Bug 22124] New: friend keyword used on nested template class results in ignoring of the class specializations

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22124

            Bug ID: 22124
           Summary: friend keyword used on nested template class results
                    in ignoring of the class specializations
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: roman.kurc at wp.pl
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

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.

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