In C++, what does a class member function typically define?

A class member function in C++ defines operations that can be performed on instances of that class. These functions allow you to define the behavior and functionality of the objects created from that class. For instance, a class representing a bank account might have member functions like deposit() and withdraw(), which specify how to manipulate the account's balance.

By providing these operations, member functions encapsulate the functionality that acts on the data contained within the class, allowing users to interact with that data in a consistent and controlled manner. This is a key part of object-oriented programming, facilitating the creation of reusable and modular code.

The other alternatives do not accurately describe the role of class member functions. While C++ includes various data types, memory management, and constructors, none of these aspects inherently define the operations on class instances as effectively as member functions do.