What are advanced features of constexpr in C++?

Can you explain the advanced features of constexpr in C++?

Sure! In C++, constexpr allows functions and variables to be evaluated at compile time. Advanced features include using constexpr with complex data structures, and even with user-defined types.

How does constexpr improve performance in C++?

Using constexpr can significantly improve performance by allowing computations to be done at compile time, reducing runtime overhead.

Can you give an example of a constexpr function?

Absolutely! Here's a simple example:

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

Are there any limitations to using constexpr?

Yes, there are limitations. For instance, constexpr functions must have a single return statement and cannot contain any non-constant expressions.