What are the best practices for using constexpr in C++14?

What are the best practices for using constexpr in C++14?

In C++14, best practices for using constexpr include ensuring that functions are simple, avoiding side effects, and using constexpr for both functions and variables.

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.

Are there any limitations I should be aware of?

Yes, in C++14, constexpr functions can contain more complex statements like loops and conditionals, but they still cannot have side effects or modify global state.

How does constexpr improve performance?

Using constexpr allows computations to be done at compile time, which can reduce runtime overhead and improve performance by eliminating the need for runtime calculations.