Отправлено DASM 12 марта 2005 г. 21:43 В ответ на: а по сути - речь похоже об анонимных объединениях, причем в стиле С++, т.к. не имеет тэга. Вынужден разочаровать - подобные union должны быть статическимим и extern ну никак объявлены ну никак не могут отправлено DASM 12 марта 2005 г. 21:42

Anonymous unions are unions that are declared without a class-name or declarator-list.
union  {  member-list  }  
Such union declarations do not declare types — they declare objects. The names declared in an anonymous union cannot conflict with other names declared in the same scope.
In C, an anonymous union can have a tag; it cannot have declarators.
Names declared in an anonymous union are used directly, like nonmember variables.
Example
// anonymous_unions.cpp
// compile with: /EHsc
#include 
using namespace std;
int main()
{
   union
   {
      double d;
      char *f;
   };
   double c = 3.3;
   char *e = "outside of union";
   d = 4.4;
   f = "inside of union";
   cout << c << ' ' << d << endl;
   cout << e << endl << f << endl;
}
Output
3.3 4.4
outside of union
inside of union
In addition to the restrictions listed in Union Member Data, anonymous unions are subject to additional restrictions: 
They must also be declared as static if declared in file scope. If declared in local scope, they must be static or automatic. 
They can have only public members; private and protected members in anonymous unions generate errors. 
They cannot have function members. 
Note   Simply omitting the class-name portion of the syntax does not make a union an anonymous union. For a union to qualify as an anonymous union, the declaration must not declare an object.