Pointer Cleaner

The operator delete frees up the allocated memory, but it doesn’t delete the pointer:


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int *x = new int;
*x = 42;

cout << "Address: " << x << endl;
cout << "Value: " << *x << endl;
delete x;

cout << "Address: " << x << endl;

cout << "Value: " << *x << endl;

As you can see, the pointer still remembers the address it refers to. Pointers that point to nonexistent units of memory are called dangling pointers. To avoid problems, you can assign to your pointer nullptr:


python

The keyword nullptr represents the value of the empty pointer. It’s a good practice to assign nullptr to a pointer so as not to crash your program by pointing to the unit of memory you will not use.

Var allt tydligt?

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Avsnitt 3. Kapitel 5

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Pointer Cleaner

The operator delete frees up the allocated memory, but it doesn’t delete the pointer:


              12345678910
            
int *x = new int;
*x = 42;

cout << "Address: " << x << endl;
cout << "Value: " << *x << endl;
delete x;

cout << "Address: " << x << endl;

cout << "Value: " << *x << endl;


python

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 5