What is const correctness in C++ overloading?

Can you explain what const correctness means in C++ overloading?

Const correctness in C++ refers to the practice of using the const keyword to indicate that a function does not modify the object it is called on. This is particularly important in function overloading, where you can have multiple functions with the same name but different const qualifications.

How does it affect function overloading?

It allows the compiler to differentiate between overloaded functions based on whether the object is const or non-const. For example, you can have one version of a function that modifies the object and another that does not, enabling safer and more predictable code.

Can you give an example of const correctness in action?

Sure! Here's a simple example:

class Example {
public:
    void display() { std::cout << "Non-const display"; }
    void display() const { std::cout << "Const display"; }
};

In this case, calling display() on a const object will invoke the const version.

What are the benefits of using const correctness?

The benefits include improved code safety, better optimization opportunities for the compiler, and clearer intent in your code, making it easier to understand and maintain.