DOC: Error C2213 Occurs When Base Is an Expression (67882)

SUMMARY

The following keywords were first introduced with Microsoft C version 6.0: Variables of type _segment are defined to hold a memory segment address.

With based variables, a base must be named to specify where the data resides. The base can be of type _segment, or can be a near or a far pointer. However, if the base is an expression, even of one of the types listed above, the following error is produced: NOTE: In Microsoft Visual C++ 32-bit Edition, version 2.0, the _segment keyword was removed and the functionality of the __based keyword changed. In 32-bit compilations, pointers based on pointer addresses are the only forms of __based valid. In such compilations, these pointers are 32-bit displacements from a 32-bit base. For more information, search for "based addressing" in the online documentation included with Visual C++ 32-bit Edition.

   _segment myseg;
   char _based( myseg ) *cptr;
				

   struct sample
   {
       _segment myseg;
   }rec;
   char _based( rec.myseg ) *cptr;
				

   _segment array[10];
   char _based( array[0] ) *cptr;