True or False: In C++, implementations of member functions can be inside the class definition for short functions.

The statement is true. In C++, it is not only permissible but also common practice for the implementations of member functions to be defined within the class definition itself, especially for short or simple functions. This practice is often seen in classes that have inline member functions.

When you define a member function inside the class, it means that the function is implicitly marked as inline. This can improve performance by allowing the compiler to replace the function call with the function's code during compilation, thus reducing the overhead of a function call for very small functions.

It's essential to have a clear understanding that this approach is mainly suitable for simple or short functions, where the benefits of inlining can be realized effectively. More complex functions, however, are typically defined outside the class definition to maintain readability and manageability of the code.

Therefore, the correct choice highlights an important aspect of C++ syntax and design for defining function bodies, especially when dealing with small, frequently used member functions.