How does using const affect performance in C++?

How does using const affect performance in C++?

Using const can improve performance by allowing the compiler to optimize code better, as it knows certain values won't change.

Can you explain the difference between passing by value and passing by const reference?

Passing by value creates a copy of the object, while passing by const reference avoids copying and allows for better performance.

Are there any scenarios where passing by value is preferred over const reference?

Yes, for small data types like integers or small structs, passing by value can be more efficient due to lower overhead.

What about the impact on memory usage?

Passing by const reference can reduce memory usage since it avoids creating copies of large objects.