What are some advanced usages of constexpr in C++14?

What are some advanced usages of constexpr in C++14?

In C++14, constexpr functions can now contain more complex statements, including loops and conditionals. This allows for more powerful compile-time computations.

Can you give me an example of a constexpr function with a loop?

Sure! Here's a simple example:

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

This function calculates the factorial of a number at compile time.

What about using constexpr with classes?

You can use constexpr constructors in classes. For example:

struct Point {
    constexpr Point(int x, int y) : x(x), y(y) {}
    int x, y;
};

This allows you to create Point objects at compile time.

Are there any limitations to using constexpr in C++14?

Yes, while C++14 expanded constexpr, there are still limitations, such as not being able to use dynamic memory allocation or certain types of I/O operations.