(gcc.info.gz) Empty Structures

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 5.15 Structures With No Members
 ===============================
 
 GCC permits a C structure to have no members:
 
      struct empty {
      };
 
  The structure will have size zero.  In C++, empty structures are part
 of the language.  G++ treats empty structures as if they had a single
 member of type `char'.
 

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