Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Compiler Error C2658
Collapse the table of content
Expand the table of content

Compiler Error C2658

'member': redefinition in anonymous struct/union

Two anonymous structures or unions contained member declarations with the same identifier but with different types. Under /Za, you will also get this error for members with the same identifier and type.

The following sample generates C2658:

// C2658.cpp
// compile with: /c
struct X {
   union { // can be struct too
      int i;
   };
   union {
      int i;   // Under /Za, C2658
      // int i not needed here because it is defined in the first union
   };
};

struct Z {
   union {
      char *i;
   };

   union {
      void *i;   // C2658 redefinition of 'i'
      // try the following line instead
      // void *ii;
   };
};
Show:
© 2015 Microsoft