From: lichray@googlemail.com   
      
   On Friday, November 16, 2012 3:20:11 AM UTC-6, MJanes wrote:   
   > it's common for generic code to accept functors by value ( including   
   > the STL ); therefore, non-copy-assignable lambdas would be nearly   
   > useless ...   
      
   Accepting something by value only requires a copy-constructor; the use   
   of copy-assignment operator can be avoided.   
      
      
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