[Bug c++/11930] New: Cannot define static template struct member

[Bug c++/11930] New: Cannot define static template struct member

[schnetter at uni-tuebingen dot de]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11930

           Summary: Cannot define static template struct member
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: schnetter at uni-tuebingen dot de
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu

I cannot define static members of template structs.  The code 
 
template<int D> 
struct x { 
  static int a; 
}; 
int x<0>::a; 
 
leads to the error message 
 
tmp.cc:5: error: too few template-parameter-lists 
 
The same code compiles fine with g++ 3.3.1.

[Bug c++/11930] Cannot define static template struct member

[bangerth at dealii dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11930


bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


------- Additional Comments From bangerth at dealii dot org  2003-08-15 16:36 -------
That's because your code is invalid. You need to write 
  template <> int x<0>::a; 
 
W.

[Bug c++/11930] Cannot define static template struct member

[schnetter at uni-tuebingen dot de]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11930


schnetter at uni-tuebingen dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


------- Additional Comments From schnetter at uni-tuebingen dot de  2003-08-15 18:06 -------
The proposed solution, namely adding "template<>" in front of the definition 
of the variable a, does not solve the problem.  The compiler now accepts the 
construct, but the object file does not contain a definition of the variable 
a.  (The syntax reminds me of a template specialisation, which is not at all 
what I want.)

[Bug c++/11930] Cannot define static template struct member

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11930


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-08-15 18:11 -------
That is because you need to instantiate the template to get the variable emitted (or use it if on a 
target that supports weak):
template<int D>
struct x {
  static int a;
};
template struct x<0>;
template <> int x<0>::a;

[Bug c++/11930] Cannot define static template struct member

[bangerth at dealii dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11930



------- Additional Comments From bangerth at dealii dot org  2003-08-15 19:42 -------
You are right, the syntax I showed is a declaration of an explicit specialization. You 
need to add an initializer to make it a definition. 
W.

[Bug c++/11930] Cannot define static template struct member

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-04-25 04:12 -------
Mark as a dup of bug 17445.

*** This bug has been marked as a duplicate of 17445 ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11930

[Bug c++/11930] Cannot define static template struct member

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-04-25 04:12 -------
Reopening to ....

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11930