What is the difference between const references and pointers in C++?

What is the difference between const references and pointers in C++?

In C++, a const reference allows you to refer to an object without modifying it, while a pointer can be reassigned and can point to null.

Can you give me an example of using a const reference?

Sure! Here's an example:

void printValue(const int &value) {
    std::cout << value << std::endl;
}

This function takes a const reference to an integer and prints its value.

What about pointers? Can you show me an example?

Absolutely! Here's an example of using a pointer:

void increment(int *value) {
    (*value)++;
}

This function takes a pointer to an integer and increments the value it points to.

When should I use a const reference instead of a pointer?

Use a const reference when you want to ensure the object is not modified and you don't need to change the reference itself. Use a pointer when you need to modify the object or when you need to represent the absence of an object.