Re: Confusing template error...

[Jeffrey Holle <jeff.holle@xxxxxxxxxxx>]

If I were trying this, I'd follow the "note" suggestion in gcc's error 
message.  That is:
  typename std::vector<typename type>::const_iterator pos;

James Urquhart wrote:
> Unfortunatly, the solution does not seem to work.
>
> "std::vector<typename type>::const_iterator pos;"
> Gives me the errors:
> error: template argument 1 is invalid
> error: template argument 2 is invalid
> error: expected `;' before '::' token
>
> I also tried doing :
> "typename std::vector<type>::const_iterator pos;"
> As someone else suggested, but that gives me the same errors as previously.
>
> On Mon, 18 Oct 2004 10:33:09 -0600, lrtaylor@xxxxxxxxxx
> <lrtaylor@xxxxxxxxxx> wrote:
>
> > Try this:
> >
> >      std::vector<typename type>::const_iterator pos;
> >
> > Thanks,
> > Lyle
> >
> >
> >
> >
> > -----Original Message-----
> > From: gcc-help-owner@xxxxxxxxxxx [mailto:gcc-help-owner@xxxxxxxxxxx] On
> > Behalf Of James Urquhart
> > Sent: Saturday, October 16, 2004 4:07 PM
> > To: gcc-help@xxxxxxxxxxx
> > Subject: Confusing template error...
> >
> > Hi there,
> >
> > I was wondering if anyone has encountered this rather bizzare syntax
> > error before.
> >
> > The code is as follows (NOTE: this is inside a class { }) :
> >
> >   template <class type>
> >   inline OutputStream & operator << (OutputStream & out, const
> > std::vector<type> &v)
> >   {
> >      std::vector<type>::const_iterator pos;
> >      pos = v.begin() ;
> >      while (pos != v.end())
> >      {
> >         out << *pos++ ;
> >      }
> >      return out ;
> >   }
> >
> > (using the good ol' STL vector)
> >
> > in the "const_iterator" line, GCC claims :
> > error: expected `;' before "pos"
> >
> > in addition, every time the "<<" operator is used, GCC claims :
> > error: dependent-name ` std::vector<type,std::allocator<_CharT>
> >
> > > ::const_iterator' is parsed as a non-type, but instantiation yields a
> >
> > type
> > note: say `typename std::vector<type,std::allocator<_CharT>
> >
> > > ::const_iterator' if a type is meant
> >
> > (basically referring again to that line)
> > If i remove the "pos;" at the end of the line, gcc seems to accept it
> > - but then i don't have a "pos" variable, which is pretty useless.
> >
> > Now onto the next problem...
> >
> > With this code (again, in a class { }) :
> >
> > template <class type>
> >   inline InputStream & operator >> (InputStream & in, std::vector<type>
> > &v)
> >   {
> >      std::vector<type>::iterator pos = v.begin() ;
> >      while (pos != v.end())
> >      {
> >         in >> *pos++ ;
> >      }
> >      return in ;
> >   }
> >
> > Every time ">>" is used on this class, GCC claims on the "iterator"
> > line:
> > error: dependent-name ` std::vector<type,std::allocator<_CharT>
> >
> > > ::iterator' is parsed as a non-type, but instantiation yields a type
> >
> > note: say `typename std::vector<type,std::allocator<_CharT>
> >
> > > ::iterator' if a type is meant.
> >
> > And the gcc variant :
> > gcc version 3.4.2  (Gentoo Linux 3.4.2-r2, ssp-3.4.1-1, pie-8.7.6.5)
> >
> > Thanks for any help.