Re: Confusing template error...

[James Urquhart <jamesu at gmail dot com>]

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@micron.com
<lrtaylor@micron.com> wrote:
> Try this:
>
>       std::vector<typename type>::const_iterator pos;
>
> Thanks,
> Lyle
>
>
>
>
> -----Original Message-----
> From: gcc-help-owner@gcc.gnu.org [mailto:gcc-help-owner@gcc.gnu.org] On
> Behalf Of James Urquhart
> Sent: Saturday, October 16, 2004 4:07 PM
> To: gcc-help@gcc.gnu.org
> 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.
>