From: zhchbin@googlemail.com   
      
   > Why use decltype(a) instead of just T ?  Seems more complicated   
   > without obvious benefit.  (But it does show you're already using   
   > c++11, so using std::is_pointer ought to be available to you.)   
      
   Sorry for the stupid thing I have done. Thanks very much for the patient   
   reply.   
   So without C++11 the job can also be done.   
      
      
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