c++/3115: g++ find a friend operator while it should not

[bourguet@cadence.com]

>Number:         3115
>Category:       c++
>Synopsis:       g++ find a friend operator while it should not
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jun 11 01:26:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     bourguet@cadence.com
>Release:        Current snapshot at code sourcery
>Organization:
>Environment:

>Description:
The appended code compile while it should not.  The
operator+ is in the lexical scope of additive_group_sig
(11.4.5) and so should be found only using argument
dependent name lookup.

template <typename T>
    struct additive_group_sig {
      friend T operator+(const T& u, const T& v) {
	T t(u);
	t += v;
	return t;
      }
    };

class  Integer  {
public:
  Integer& operator+=(const Integer&);
private:
  additive_group_sig<Integer> x;
};

int main() {
  Integer d, e, f;
  f = e + d;
}
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: