[Bug c++/24161] New: Lookup of template member function finds global type.

[redi at gcc dot gnu dot org]

// A template class.
template< typename, typename > struct f {};

// A template function that calls a member template function.
template< typename T >
void call_f( T& t )
{
   t.template f< int >();
   // t.T::template f< int >();  // this line works
}


struct F {
    template <typename> void f() {}
};

int main()
{
    F obj;
    call_f(obj);
}

GCCs 3.4 - 4.1 error with:

phil2.cc: In function ‘void call_f(T&)’:
phil2.cc:8: error: wrong number of template arguments (1, should be 2)
phil2.cc:2: error: provided for ‘template<class, class> struct f’


Shouldn't the lookup of the id-expression "template f<int>" be done in the scope
of T according to 3.4.5/2, so shouldn't it be ignoring ::f ?

If you qualify the function call with "T::" it works as expected. 
If either ::f or ::call_f() is not a template, it works.

I expect the template-id "template f<int>" to be dependent on T, so get looked
up at the point of instantiation, in the scope of F, finding F::f.  It seems
that either it isn't dependent (in which case it should not find F::F if you
comment out the declaration of ::f) or something means that lookup of a
template, within a template disregards 3.4.5/2.  Or it's a bug, but I'm not
convinced I haven't overlooked something.

-- 
           Summary: Lookup of template member function finds global type.
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: redi at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24161