c++/8930: bogus ambiguity taking the address of a member template, take 2

c++/8930: bogus ambiguity taking the address of a member template, take 2

[sebor]

>Number:         8930
>Category:       c++
>Synopsis:       bogus ambiguity taking the address of a member template, take 2
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Dec 13 12:06:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     sebor@roguewave.com
>Release:        3.2
>Organization:
>Environment:

>Description:
This still fails with 3.2. The original report, PR 4361, was closed in March 02.

Thanks
Martin

$ cat t.cpp; gcc --version; gcc t.cpp -c; echo $?
template <class T>
class auto_ptr;

template <class T>
struct auto_ptr_ref
{
    template <class U>
    auto_ptr_ref (auto_ptr<U>&) throw () { }
};


template<class T>
struct auto_ptr
{
    template <class U>
    operator auto_ptr_ref<U>() throw () {
        return auto_ptr_ref<U>(*this);
    }

    template <class U>
    operator auto_ptr<U>() throw () {
        return auto_ptr<U>();
    }
};

struct B { };
struct D: B { };

int main ()
{
    auto_ptr<B> (auto_ptr<D>::*pf)() = &auto_ptr<D>::operator auto_ptr<B>;
}
gcc (GCC) 3.2
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

t.cpp: In function `int main()':
t.cpp:32: no matches converting function `operator auto_ptr_ref<U>' to type `
   struct auto_ptr<B> (struct auto_ptr<D>::*)()'
t.cpp:16: candidates are: template<class U> auto_ptr::operator 
   auto_ptr_ref<U>() [with U = U, T = D]
1
>How-To-Repeat:

>Fix:

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

Re: c++/8930: bogus ambiguity taking the address of a member template, take 2

[bangerth]

Synopsis: bogus ambiguity taking the address of a member template, take 2

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Fri Dec 13 12:47:38 2002
State-Changed-Why:
    As Nathan explained in 4361, this is fixed on mainline, and
    since it is not a regression, it will not get fixed in 3.2.2.
    I checked that it indeed works on mainline as of last week.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8930