23. Advice

• Use operators in ways which mimic their native use:

  1. Don't take or return unexpected types.

  2. Make sure you provide a complete set.

• Use named functions at first, build operators on those later.

• Be careful with conversion to other types.

• Define assignment if you define a copy constructor.

• Prefer member functions over non-members for operations that need access to the implementation.

• Prefer non-member functions over members for operations that do not need access to the implementation.