[Bug c++/35631] New: operator overloads defined as a friend within a class are not always correctly resolved

["nick dot orlov at mail dot ru" <gcc-bugzilla at gcc dot gnu dot org>]

The following example demonstrates the issue:

============================
#include <utility>
#include <iostream>

#define INLINE_FRIEND

class Outer {

  enum InnerEnum {
    Value0 = 0
  };

  typedef std::pair<InnerEnum, int> InnerPair;

  friend bool operator==(const InnerPair& lhs, const InnerPair& rhs)
#ifdef INLINE_FRIEND
  {
    return lhs.first == rhs.first;
  }
#else
  ;
#endif

public:
  static void test();
};


#ifndef INLINE_FRIEND
bool operator==(const Outer::InnerPair& lhs, const Outer::InnerPair& rhs)
{
  return lhs.first == rhs.first;
}
#endif

void Outer::test()
{
  InnerPair pair1(Value0, 0);
  InnerPair pair2(Value0, 1);

  std::cout << (pair1 == pair2 ? "==" : "!=") << std::endl;

}

int main()
{
  Outer::test();
  return 0;
}

============================

When compiled with 4.1/4.2/4.3 this prints "!=", with 3.3/3.4 - '=='.
I believe that 3.3/3.4 were doing "the right thing" (unless I'm misreading the
standard)

I'm not sure if 4.0 is affected by this since I do not have it installed.


-- 
           Summary: operator overloads defined as a friend within a class
                    are not always correctly resolved
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: nick dot orlov at mail dot ru


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35631