NGWS SDK Documentation  

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Compiler Warning (level 1) C4259

'identifier' : pure virtual function was not defined

This warning is generated once for each undefined abstract function defined in a class specified in a C2259 error message. The following sample generates C4259:

class A {
   public:
      virtual void f() = 0;      
      /* the following code resolves the warning
      virtual void f() {
      }
      */
};        

void main() {
   A a;   // C4259         
}