NULL pointer and Some thoughts C++

Its me again , now came with a NULL pointer in hand... You may think what so special about NULL pointer , right ? .

it is very special . for example even if multiply two NULL pointers ,you will get a the result as a NULL pointer.. is it interesting ? .. :) I was just joking.. 

I wrote this beacause mostly people checks in destructor something like this

if(p) delete p;

 This is not needed , you can just avoid that checking, because delete NULL , will not cause any probles.

so if you have more pointers in your class to delete , avoid that checking is too good to see.

I think Now it is good to mention about this function  IsBadWritePtr . This function can be used to check

whether one address is good to write. In MFC there is function AfxIsValidAddress which will call this function to check.

The next thing about NULL pointer is that , You can still call member functions with null pointer, Like

CCLemon *p = NULL;

p->Drink() ;

Still this will works . but only one condition , Drink should not access any member variables of class CCLemon , and Drink shouldn't be a virtual function. If Drink is a virtual function result is Bhooommm!!!