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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/51757] friend defined inside class and declared inside main linker error
Date: Thu, 05 Jan 2012 10:36:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51757

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
   Last reconfirmed|                            |2012-01-05
         Resolution|INVALID                     |
     Ever Confirmed|0                           |1

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-01-05 10=
:35:56 UTC ---
There is no A::func, that's a friend not a member function.=20

[class.friend]

-6-  A function can be defined in a friend declaration of a class if and on=
ly
if the class is a non-local class (9.8), the function name is unqualified, =
and
the function has namespace scope. [ Example:
class M {
  friend void f() { } // definition of global f, a friend of M,
                      // not the definition of a member function
};
=E2=80=94end example ]
-7- Such a function is implicitly inline. A friend function defined in a cl=
ass
is in the (lexical) scope of the class in which it is defined. A friend
function defined outside the class is not (3.4.1).