C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C2036
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     Compiler error C2036
 
     identifier 'class-key' : unknown size
 
     The address of the specified undeclared identifier was used.
 
     The size of an undeclared object cannot be used.
 
     The following is an example of this error:
 
          struct A* pA;
          struct B { int i; };
          B* pB;
 
          void main()
          {
             pA++;   // error, size of A not known
             pB++;   // OK, B has been declared
          }
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