What are the limitations of constexpr in C++14?

What are the limitations of constexpr in C++14?

In C++14, constexpr functions can contain more complex statements, but they still have limitations. For example, they cannot contain try-catch blocks, and certain operations like dynamic memory allocation are not allowed.

Can you give me an example of a constexpr function in C++14?

Sure! Here's a simple example:

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

This function can be evaluated at compile time if the argument is a constant expression.

What changes were made in C++17 regarding constexpr?

C++17 expanded the capabilities of constexpr functions significantly. For instance, you can now use if statements, loops, and even try-catch blocks within constexpr functions.

Are there any performance implications of using constexpr?

Using constexpr can improve performance by allowing computations to be done at compile time, reducing runtime overhead. However, excessive use of complex constexpr functions may lead to longer compile times.