[Solved] How to check c++ pointer pointing to invalid memory address? [duplicate]

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I end up with this solution It may help someone who runs into the same problem

  #include<iostream>
  
  class Node{
   public:
    int data;
    Node * next , * prev;
  };
  
  template<class T>
  void DeletePtr (T*** ptr) {
      T** auxiliary = &(**ptr);
      delete *auxiliary;
      **ptr = nullptr;
      *ptr = nullptr;
  }
  
  
  // Driver Code
  int main () {
  
     Node * node = new Node{ 3 , nullptr , nullptr };
     Node ** ptr = &node;
     DeletePtr(&ptr);
  
     if(ptr == nullptr && node == nullptr)
        std::cout << "ptr is null \n";
     else std::cout << "ptr is not null !\n";
     return 0;
   }

solved How to check c++ pointer pointing to invalid memory address? [duplicate]