[Bug c++/11338] New: Function template overload resolution failure

[Bug c++/11338] New: Function template overload resolution failure

[mstaley at lanl dot gov]

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11338

           Summary: Function template overload resolution failure
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mstaley at lanl dot gov
                CC: gcc-bugs at gcc dot gnu dot org

(I tried to enter this bug report into Bugzilla yesterday, but it apparently
didn't get entered. This is the first time I've used Bugzilla, and I apologize
in advance if this bug gets entered twice.)

The following code does not compile with g++ 3.3, or with g++ 3.4 (with the new
parser, right?), which my sysadmin installed from the CVS repository on June 25.
I'm running on a Linux box with Red Hat 9.

     #include <iostream>

     template<int n>
     class bar {
     };

     template<class T>
     T fun(const bar<1> &)
     {
        std::cout << "fun #1" << std::endl;
        return T();
     }

     template<class T, class BAR>
     T fun(const BAR &)
     {
        std::cout << "fun #2" << std::endl;
        return T();
     }

     int main(void)
     {
        fun<double>(bar<1>());  // isn't fun #1 the better match?
        fun<double>(bar<2>());
     }

My take is that this is legal C++, with "fun #1" being the better match for the
first call in the body of main(). G++ says this call is ambiguous. Incidentally,
the Intel C++ compiler also reported an error; however, Metrowerks C++ and KAI
C++ (the latter of which in my experience is usually correct) DID compile this
code.

Okay, what's the verdict?

[Bug c++/11338] [3.3/3.4 Regression] [DR 214] Function template overload resolution failure

[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=11338


bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE
            Summary|Function template overload  |[3.3/3.4 Regression] [DR
                   |resolution failure          |214] Function template
                   |                            |overload resolution failure


------- Additional Comments From bangerth at dealii dot org  2003-06-26 22:06 -------
This is a duplicate of 4672. It's indeed a bug in gcc.
W.

*** This bug has been marked as a duplicate of 4672 ***