C2021: Generate NULL-check for class pointer

[DISABLE, INFORMATION , WARNING, ERROR]

Operations with pointers to related classes always need separate NULL-checks before adding offsets from base classes to inherited classes.

  class A {

  

  };

  

  class B : public A{

  

  };

  

  void main() {

  

    A *ap;

  

    B *bp;

  

    ap=bp;  // warning

  

  }

  

Try to avoid operations with pointers to different, but related classes.