RE: Confusing template error...

RE: Confusing template error...

[lrtaylor]

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.

Re: Confusing template error...

[James Urquhart]

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.
>

Re: Confusing template error...

[Jeffrey Holle]

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@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.
>>
> 
> 

Confusing template error...

[James Urquhart]

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.