From: walter.mascarenhas@googlemail.com   
      
   The code below does not compile in g++ 4.7.2: it says   
   that the template parameter S is not used in Foo's   
   specialization below. Is g++ correct on this? If so,   
   how would I specialize the struct Foo for   
   T = std::vector::iterator in a general way?   
      
      
   #include    
   template    
   struct Foo   
   {   
   };   
      
   template    
   struct Foo< typename std::vector::iterator >   
   {   
   };   
      
      
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