What is a forward declaration in C++?

What is a forward declaration in C++?

A forward declaration in C++ is a declaration of a class or function that tells the compiler about its existence before its full definition is provided.

Why would I use a forward declaration instead of including a header file?

Using a forward declaration can reduce compilation dependencies and improve compile times, especially in large projects.

Can you give me an example of a forward declaration?

Sure! Here's a simple example:

class MyClass; // Forward declaration

class AnotherClass {
    MyClass* myClassPtr; // Pointer to MyClass
};

Are there any limitations to using forward declarations?

Yes, you cannot use the forward-declared class or function until it is fully defined. This means you can't create objects or call functions until the complete definition is available.