C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C4097
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     Compiler warning (level 3) C4097
 
     nonstandard extension : typedef-name 'identifier1' used as synonym
     for class-name 'identifier2'
 
         typedef struct _T
         {
            int i;
         } T;
 
         struct U : T
         {                 // warning
            int j;
         };
 
         struct V : _T
         {                 // OK
            int j;
         };
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