C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C4049
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     Compiler warning (level 1) C4049
 
     'operator' : indirection to different types
 
     The pointer expressions used with the given operator had different
     base types.
 
     The pointer expressions were used without conversion.
 
     For example, the following code generates this warning:
 
          struct ts1 *s1;
          struct ts2 *s2;
          s2 = s1;   // Warning
                                    -♦-