------- Comment #8 from walton at seas dot harvard dot edu 2010-07-21 17:35
-------
Subject: Re: Name of member class of template class cannot
be used as argument type.
Oh, I see. You are just telling me that the '::' will be interpreted
as a global namespace indicator. In the case of the test code everything
is in the global namespace so it has no effect, but in other cases it
might have an effect.
I still would like to know if this is a bug and I need to do the
workaround.
Bob
On Wed, 21 Jul 2010, Bob Walton wrote:
>
> Replacing '::' with ' ' does not change the error message. I don't
> think you are right about the compiler mistaking `typename' for a namespace;
> there is no way to test this as `namespace typename { ... }' is rejected by
> the compiler.
>
> Bob
>
> On Wed, 21 Jul 2010, redi at gcc dot gnu dot org wrote:
>
>>
>>
>> ------- Comment #6 from redi at gcc dot gnu dot org 2010-07-21 17:11
>> -------
>> (In reply to comment #5)
>>>
>>> OK, adding `typename::' fixed the problem with the compiler
>>
>> That should be just typename, it's not a namespace. When the standard says
>> "qualified with typename" it means "typename T::A" not "typename::T::A"
>>
>> The latter is parsed as "typename ::T::A" i.e. "T::A" in the global
>> namespace,
>> which you're telling the compiler is a type
>>
>>
>>
>>> balking at the template function definition, but now
>>> the compiler accepts the definition and then appears
>>> to forget it, so it cannot be used. Test code below:
>>> see first commented line.
>>> // The following definition is accepted BUT then
>>> // appears to be `forgotten' so it cannot be used.
>>> //
>>> template < typename T >
>>> int funcC ( typename::B<T>::C * c ) { return 0; }
>>
>> T is in a non-deduced context here, see
>> http://www.advogato.org/person/redi/diary/185.html
>>
>>
>> --
>>
>>
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45002
>>
>> ------- You are receiving this mail because: -------
>> You reported the bug, or are watching the reporter.
>>
>
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45002
