From: cassio.neri@googlemail.com   
      
   On Friday, November 16, 2012 9:20:09 AM UTC, Zhihao Yuan wrote:   
      
   > However, I want it to be able to work on just a type, to work as an   
   > integral_constant.  Is that doable?  Comments on how to implement an   
   > is_swapable are also welcome.  Thanks.   
      
   Once I had the same need and implemented as below. I'm sure it's far from   
   perfect but it might serve as a starting point. I  also welcome comments on   
   my implementation.   
      
   //    
   namespace details {   
   using std::swap;   
      
   template    
   struct is_nothrow_swappable : public std::false_type {   
   };   
      
   template    
   struct is_nothrow_swappable(),std::declval()))>::type> : public std::true_type   
   {   
   };   
      
   }   
      
   using details::is_nothrow_swappable;   
      
   //    
      
   To be honest, I don't remember why I considered two template parameter types   
   T and U :-(   
      
   Cheers,   
   Cassio.   
      
      
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