What are the benefits of using constexpr in C++?

What are the benefits of using constexpr in C++?

Using constexpr allows for compile-time evaluation of functions and variables, improving performance and enabling optimizations.

Can you give me an example of how constexpr can be used?

Sure! You can define a constexpr function to calculate the factorial of a number at compile time, like this:

constexpr int factorial(int n) {
    return n <= 1 ? 1 : n * factorial(n - 1);
}

Are there any limitations to using constexpr?

Yes, constexpr functions must have a single return statement and cannot contain any side effects, like modifying global variables.

How does constexpr compare to regular functions?

Unlike regular functions, constexpr functions can be evaluated at compile time, which can lead to faster execution and reduced runtime overhead.