Thread: How to use of const keyword with pointers?

As you would with any other type.

There are three variants:
1) const T* p
2) T* const p
3) const T* const p

1) says the pointer points to const. Thus:

int x;
const T* p = &x;
p = &x; // OK - reassign contents of variable
*p = 0; // Error - can't change value of what it points to

2) says that the variable itself is const. Thus:

int x;
const T* p = &x;
p = &x; // Error - can't change value of the variable
*p = 0; // OK - can change value of what it points to

3) is basically a combination of both.