What are the benefits of using constexpr in C++17?

What are the benefits of using constexpr in C++17?

Using constexpr in C++17 allows for compile-time evaluation of functions and variables, improving performance and enabling more optimizations.

Can you give me an example of a constexpr function?

Sure! Here's a simple example:

constexpr int square(int x) {
    return x * x;
}

This function computes the square of a number at compile time.

How does constexpr differ from const?

While both constexpr and const define constants, constexpr guarantees that the value is computed at compile time, whereas const can be initialized at runtime.

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.