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. Here are some best practices:

1. Use const for function parameters when the function does not modify them.
2. Declare member functions as const if they do not modify the object.
3. Use const pointers and references to ensure the data they point to cannot be changed.
4. Prefer const over non-const whenever possible to enhance code safety.

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 function, the parameter 'value' is declared as const, meaning it cannot be modified within the function.

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 of the class. For example:

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

Are there any performance benefits to using const?

Yes, using const can lead to performance improvements. It allows the compiler to make optimizations, as it knows certain variables won't change. This can result in better-optimized code.