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

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

Using const correctly can enhance code safety and readability. Here are some best practices: 1. Use const for variables that should not change. 2. Use const references for function parameters to avoid unnecessary copies. 3. Use const member functions to indicate that they do not modify the object.

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

Sure! Here's an example:

void printValue(const int& value) {
    std::cout << value << std::endl;
}

In this case, value is a const reference, ensuring that the function cannot modify the original integer.

What about using const with class member functions?

Great question! When you declare a member function as const, it guarantees that the function will not modify any member variables. For example:

class MyClass {
public:
    int getValue() const {
        return value;
    }
private:
    int value;
};

Are there any downsides to using const?

While const is very useful, overusing it can lead to code that is harder to read or maintain, especially if it complicates function signatures. It's important to find a balance.