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   fmatthew5876  spake the secret code   
   <061dc3c8-ec30-4a9c-8b97-4dcba5c28a27@googlegroups.com> thusly:   
      
   ><< and >> are bit shift operators. I would only define them for a class where   
   >they were actually shifting bits, like std::bitset.   
   >   
   >The only reason we accept << and >> is because the standard library does it.   
   >If you looked at someone else's code base where they invented a new purpose   
   >for some operator you'd probably be very skeptical, I know I would.   
      
   Boost.Spirit overloads a bunch of operators to make an embedded DSL   
   for parsers.  It works fine in that context; noone is confused that <<   
   in a spirit parser is doing bit shift.   
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