What are some advanced uses of const in C++?

What are some advanced uses of const in C++?

In C++, the const keyword can be used in various advanced ways, such as in constant expressions, pointers, and member functions.

Can you explain how const works with pointers?

Sure! A pointer can be declared as a pointer to a constant value or a constant pointer. For example, const int* ptr means the value pointed to by ptr cannot be changed, while int* const ptr means the pointer itself cannot be changed.

What about using const with member functions?

When you declare a member function as const, it indicates that the function will not modify any member variables of the class. This is useful for ensuring that certain functions can be called on const instances of the class.

Are there any performance benefits to using const?

Yes, using const can help the compiler optimize the code better, as it can make assumptions about the immutability of variables, potentially leading to more efficient code generation.