What are some examples of using const references in C++?

What are some examples of using const references in C++?

In C++, a const reference allows you to pass large objects without copying them. For example:

void printValue(const std::string& str) {
    std::cout << str << std::endl;
}

This function takes a const reference to a string, preventing unnecessary copies.

Can you explain why we use const references instead of regular references?

Using const references ensures that the function cannot modify the argument, providing safety. It also avoids the overhead of copying large objects, making it more efficient.

Are there any limitations to using const references?

Yes, you cannot modify the object being referenced, and you cannot bind a temporary object to a non-const reference. However, const references can bind to temporaries.

Can you give me another example with a custom class?

Sure! Here's an example with a custom class:

class Point {
public:
    int x, y;
    Point(int x, int y) : x(x), y(y) {}
};

void displayPoint(const Point& p) {
    std::cout << "Point: (" << p.x << ", " << p.y << ")" << std::endl;
}

This function takes a const reference to a Point object.