Ensuring constant correctness for a program

Although there is no formal definition, constant correctness means objects that are not supposed to be modified (are immutable) remain unmodified indeed. As a developer, you can enforce this by using the const keyword for declaring parameters, variables, and member functions. In this recipe, we will explore the benefits of constant correctness and how to achieve it.

How to do it...

To ensure constant correctness for a program, you should always declare as constant:

• Parameters to functions that are not supposed to be modified within the function:

        struct session {};

        session connect(std::string const & uri, 
                        int const timeout = 2000)
        {
           /* do something */
        ...