union

C++ Reference

union
Syntax:
  union union-name {
  public-members-list;    
  private:
  private-members-list;
  } object-list;

A union is like a class, except that all members of a union share the same memory location and are by default public rather than private. For example:

   union Data {
     int i;
     char c;
   };           
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