c++/3332: friend function declaration in a class in a namespace causes error

c++/3332: friend function declaration in a class in a namespace causes error

[aroach]

>Number:         3332
>Category:       c++
>Synopsis:       friend function declaration in a class in a namespace causes error
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Thu Jun 21 08:46:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Anthony Roach
>Release:        3.0
>Organization:
>Environment:
System: Linux stoic 2.2.19 #1 Thu Apr 5 15:18:02 EST 2001 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc-3.0/configure --prefix=/usr/local/opt/gcc-3.0
>Description:
Implicitly declaring a function through a friend declaration in a class
definition where the class and the function are members of the same
namespace doesn't compile.
>How-To-Repeat:

source that produces the bug:
// BEGIN: friendBug.cpp
namespace N
{
	class A;
}

class N::A
{
	friend void func(void);
};

void N::func(void)
{

}

int main()
{
	return 0;
}
// END: friendBug.cpp

Compile with: gcc friendBug.cpp

gcc output:
friendBug.cpp:13: `void N::func()' should have been declared inside `N'

>Fix:
Workaround:
// BEGIN: friendFixed.cpp
namespace N
{
	class A;
	void func(void);
}

class N::A
{
	friend void func(void);
};

void N::func(void)
{

}

int main()
{
	return 0;
}
// END: friendFixed.cpp
>Release-Note:
>Audit-Trail:
>Unformatted:

Re: c++/3332: friend function declaration in a class in a namespace causes error

[neil]

Synopsis: friend function declaration in a class in a namespace causes error

State-Changed-From-To: analyzed->suspended
State-Changed-By: neil
State-Changed-When: Thu Jan  2 11:33:51 2003
State-Changed-Why:
    FWIW Comeau rejects this testcase

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3332

Re: c++/3332: friend function declaration in a class in a namespace causes error

[nathan]

Synopsis: friend function declaration in a class in a namespace causes error

State-Changed-From-To: open->analyzed
State-Changed-By: nathan
State-Changed-When: Tue Oct 22 02:59:51 2002
State-Changed-Why:
    confirmed. I think this is well-formed. [7.3.1.2]/3 seems
    to be relevant. The question to answer is 'in the defintion of 
    N::A, what is the innermost enclosing namespace?'. Is it
    '::' - that being the one that is 'open', or is it '::N'
    - that being the one containing 'A'. It would be bizzare
    if the answer was '::'.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3332