What are the limitations of constexpr in C++?

What are the limitations of constexpr in C++?

The main limitations of constexpr include restrictions on the types of expressions that can be evaluated at compile time, such as dynamic memory allocation and certain runtime constructs.

Can constexpr functions have side effects?

No, constexpr functions cannot have side effects. They must produce the same output for the same input and cannot modify global or static variables.

Are there any performance benefits to using constexpr?

Yes, using constexpr can lead to performance improvements since computations are done at compile time, reducing runtime overhead.

What C++ standards introduced constexpr?

constexpr was introduced in C++11, but it was significantly enhanced in C++14 and C++17, allowing more complex expressions.

Can I use constexpr with classes?

Yes, you can use constexpr with classes, but the class members must also be constexpr, and the constructors must meet certain criteria.