Question

I am reading through a framework for a game, and it has a Door struct inside the Room class as follows:

#include <vector>

class Room{
public:
    struct Door{
        unsigned name;
        unsigned orientation;
        Room* room1;
        Room* room2;
    };
    std::vector<Door*> adjacent;
};

What is the purpose of defining a struct inside of a class? And, does it make a difference what access modifier that the struct is defined with?

Answer 1

What is the purpose of defining a struct inside of a class?

It’s just a nested type.

And, does it make a difference what access modifier that the struct is defined with?

If Door was declared private then trying to declare a variable of type Room::Door outside this class will give an error.