How to avoid memory Leak when Using pointers?

Answer 1

There are many pointer wrapper classes.

2 examples:
There is a unique_ptr which deletes its underlying element in its deconstructor. unique_ptr is not slower than a raw pointer which is deleted by hand.
There is also a shared_ptr. The underlying element of a shared_ptr is just deleted if no other shared_ptr points to it.

But what if you must deal with old C code which uses raw pointers and something like ptr->free()? You creat a ptr_handle class which calls ptr->free() in its deconstructor. It's not slower and this way, you can be sure that ptr doesn't leak.

Answer 2

Rahul thank you but can we also assign a NULL Value to the pointer after it has been deleted ?
delete p;
p=NULL

Answer 3

Martin Taylor thank you

Answer 4

The memory that has been dynamically allocated for a certain purpose must be deallocated as soon as that purpose is over,in order to prevent memory leak.