[Bug c++/16057] Error message omits overload candidate

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-06-18 14:52 -------
Confirmed. Here is some code: 
---------------- 
void endl (int); 
void endl (double); 
 
struct A {}; 
 
void operator << (A &, int); 
 
template<typename U> 
void operator << (A &, U); 
 
int main() { 
  A* e; 
  *e << endl; 
} 
--------------------- 
Note that 'endl' is the set of overloads; this would be alright if we 
could find a function that picks a single element from this set of 
overloads by a suitable type for the second argument, but we don't 
have such a function. Instead, we get this: 
 
g/x> /home/bangerth/bin/gcc-3.4-pre/bin/c++ -w -c x.cc 
x.cc: In function `int main()': 
x.cc:13: error: no match for 'operator<<' in '*e << endl' 
x.cc:6: note: candidates are: void operator<<(A&, int) 
 
Indeed, only one of the overloads of operator<< is listed. Now, one 
could argue that this isn't even a bug: the second, templated overload, 
is unable to pick among the overload set, so it can't possibly be a 
candidate anyway, but this is a rather narrow interpretation. I would 
concede that it may make sense  to list all operator<< overloads here. 
 
W. 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |minor
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-06-18 14:52:28
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16057