What are some examples of constexpr in C++17?

What are some examples of constexpr in C++17?

C++17 introduced several enhancements to constexpr. For example, you can now use it with more complex functions, including those with loops and conditionals.

Can you show me a simple example of a constexpr function?

Sure! Here's a simple example:

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

This function can be evaluated at compile time.

What about using constexpr with classes?

You can use constexpr constructors in classes. For instance:

class Point {
public:
    constexpr Point(int x, int y) : x_(x), y_(y) {}
    constexpr int getX() const { return x_; }
    constexpr int getY() const { return y_; }
private:
    int x_, y_;
};

Are there any limitations to using constexpr?

Yes, there are some limitations. For example, you cannot use dynamic memory allocation or certain types of I/O operations within a constexpr function.