What are the best practices for using const in C++?

What are the best practices for using const in C++?

Using const in C++ helps to prevent accidental modification of variables. It's best to use it for function parameters, return types, and member functions when the object should not be modified.

Can you give me an example of using const with function parameters?

Sure! When passing an object to a function, you can use const reference like this: void func(const MyClass& obj) { ... }. This prevents the function from modifying the object.

What about using const with class member functions?

You can declare a member function as const by adding const at the end of the function declaration. This indicates that the function will not modify any member variables.

Are there any performance benefits to using const?

Yes, using const can lead to performance improvements by enabling certain optimizations and allowing the compiler to make better decisions about memory usage.