What are the limitations of constexpr in C++?

What are the limitations of constexpr in C++?

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

Can I use constexpr with all types of functions?

No, not all functions can be declared as constexpr. For instance, functions that contain loops or those that perform I/O operations cannot be constexpr.

What about constexpr with classes and constructors?

You can use constexpr with classes and constructors, but the constructor must also meet certain criteria, such as not having any non-constexpr members.

Are there any performance benefits to using constexpr?

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

How does constexpr differ from inline functions?

While both can improve performance, constexpr guarantees compile-time evaluation, whereas inline functions are just suggestions to the compiler to reduce function call overhead.