[Bug c++/21601] New: Friend of template argument constructor

[Bug c++/21601] New: Friend of template argument constructor

[charles dot gretton at gmail dot com]

If we try and make \class{A} inherit from \class{B<A>} which is
friends with A's constructor, the compiler segfaults.

template<typename T>
class B
{
public:
    friend T::T(B&);

//     void some()
//     {
//         T t = T::T(*this);
//     }
    
};

class A : public B<A>
{
public:
    A(B<A>& b);
};


A::A(B<A>& b)
    :B<A>(b)
{
}

-- 
           Summary: Friend of template argument constructor
           Product: gcc
           Version: 3.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: charles dot gretton at gmail dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21601

[Bug c++/21601] Friend of template argument constructor

[charles dot gretton at gmail dot com]

------- Additional Comments From charles dot gretton at gmail dot com  2005-05-16 01:37 -------
Should report:

src_file_name:9: error: template parameters cannot be friends

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21601

[Bug c++/21601] Friend of template argument constructor

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2005-05-17 16:41 -------
This is already fixed in gcc4.0 which says 
 
g/x> /home/bangerth/bin/gcc-4*/bin/c++ -c x.cc 
x.cc:5: error: ISO C++ forbids declaration of ‘T’ with no type 
x.cc: In instantiation of &#8216;B<A>&#8217;: 
x.cc:14:   instantiated from here 
x.cc:5: error: invalid use of undefined type &#8216;class A&#8217; 
x.cc:14: error: forward declaration of &#8216;class A&#8217; 
 
  
W.  

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
           Keywords|                            |ice-on-invalid-code
         Resolution|                            |FIXED
   Target Milestone|---                         |4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21601