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Date: Fri, 09 Apr 2010 13:57:00 -0000
From: Frank Winter <frank.winter@desy.de>
To: gcc-help@gcc.gnu.org
Subject: Re: Avoid typename repetition in template specialization
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Dear all,

Thanks John and Axel!

But, as I have a lot of these constructs typedef is exactly the problem:

   typedef PScalar< PColorMatrix< RComplex<REAL64>, Nc> > T1;
   typedef PSpinVector< PColorVector< RComplex<REAL64>, Nc>, Ns > T2;
   typedef OpMultiply Op;
   template<>
   inline BinaryReturn< T1 , T2 , Op >::Type_t
   operator*(const T1& l, const T2& r )
   {
     BinaryReturn< T1 , T2 , Op >::Type_t d;
     // code
     return d;
   }

now, this conflicts:

   typedef PSpinVector< PColorVector< RComplex<REAL64>, Nc>, Ns > T1;
   typedef PSpinVector< PColorVector< RComplex<REAL64>, Nc>, Ns > T2;
   typedef OpMultiply Op;
   template<>
   inline BinaryReturn< T1 , T2 , Op >::Type_t
   operator+(const T1& l, const T2& r )
   {
     BinaryReturn< T1 , T2 , Op >::Type_t d;
 	// code
     return d;
   }

If there would be a way to undefine a typename in the actual namespace 
this would help a lot in this case. Is there functionality for this or is 
there a workaround for my case that occurs to you?

Best regards,
Frank Winter