What are the new features of constexpr in C++11?

What are the new features of constexpr in C++11?

C++11 introduced several enhancements to constexpr, allowing more complex computations at compile time. You can now use it with functions that have multiple statements, and it supports more types, including user-defined types.

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.

What are the limitations of constexpr in C++11?

In C++11, constexpr functions can only contain a single return statement. You can't have loops or conditionals inside them, which limits their complexity.

How has constexpr evolved in later versions of C++?

In C++14 and later, constexpr has become more powerful, allowing for more complex functions, including those with loops and conditionals, making it much more versatile.