Hello, I have a question in Chapter 6 RoboCatRTS

[insooneelife]

Hello, I have a question in Chapter 6 RoboCatRTS.
In class CommandList, there is no copy constructor defined.
But in class TurnData, it calls copy constructor of CommandList in TurnData's main constructor.
I don't understand the intend for this code.
Is there some kind of life cycle issue about CommandList?

[chalonverse]

Even though a copy constructor isn't defined in CommandList, there's going to be a default copy constructor provided by C++ that would invoke a copy of the deque member variable.

The reason why the TurnData makes a copy of the CommandList is because the input manager has only one CommandList that is reused for every turn. But all of the previous turn data is saved, so if the code didn't make a copy that would be lost.