Get a std::move on

• You cannot move from a const thing: not allowed to mutate
• Auto-generated constructors do not have strong exception guarantees
• Adding a custom empty destructor prevents the move constructors being generated automatically
• Fundamental types are copied when moved as they don't handle resources
• Move is used when returning from a function or we make a variable an rvalue with std::move
• && modifier indicates parameter is an object that we intend to move from instead of copying