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Date: Fri, 26 May 2006 22:50:00 -0000
Subject: [Bug c++/27775]  New: incorrect "ambiguous" error message with multiple inheritance and nested class.
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From: "rnewman at compubrite dot com" <gcc-bugzilla@gcc.gnu.org>
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The test-case:

// testcase: -------------------------
struct A
{
    struct B
    {
    };
};

struct C : A, A::B
{
    void foo(B b);
    void bar(B* pb);
};
//------------------------------------
==============
The error:
foo.cc:11: error: reference to 'B' is ambiguous
foo.cc:5: error: candidates are: struct A::B
foo.cc:5: error:                 struct A::B
foo.cc:11: error: 'B' has not been declared
foo.cc:12: error: reference to 'B' is ambiguous
foo.cc:5: error: candidates are: struct A::B
foo.cc:5: error:                 struct A::B
foo.cc:12: error: 'B' has not been declared

-------------
There is only one type "B", whether it's referred to as ::A::B, (from the
global scope), or "A::B", injected from the first inheritance, or simpy "B"
injected from the second.  These all refer to the same type.  There is no
ambiguity.

Note, GCC accepts this if the "foo" member functions are delcared w/ namespace
qualification.  For example, this code is accepted:

struct C : A, A::B
{
    void foo(A::B b);
    void bar(A::B* pb);
};
=================
This behaviour is found in the following versions of GCC:
egcs-2.91.66, gcc-3.2, gcc-3.3, gcc-3.4.3, gcc-3.4.6, gcc-4.0
I haven't tried other versions.


-- 
           Summary: incorrect "ambiguous" error message with multiple
                    inheritance and nested class.
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rnewman at compubrite dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27775