Thread: Sharing Class functions

Hello there, it's been a while since I posted so it's nice to see you guys again!

Straight to the point... I have a class which has a certain function, but I need that function to be used by another class. I made some research and the best solution might be using a "friend function". Is it the best way to do so? Can anyone shed some light on this topic for a better understanding? Thanks in advance.

Code:

class Playlist
{
public:
    Playlist();


    // "set" methods
    void setMusicList(const std::string& filename);


    // "get" methods
    std::vector<uint> getMusicList() const {return musicList;};


    // other
    void addSongToPlaylist(uint songID);
    void removeSongFromPlaylist(uint songID);
    void showPlaylist() const;  -> Function which needs to be used by a RadioStation (class) function
    void orderPlaylist();
    void writePlaylistToFile(const std::string& filename);


private:
    std::vector<uint> musicList;


    // these methods can be private, the function orderPlaylist calls them
    void swapElementsInPlaylist();
    bool isOrdered() const;
};


class RadioStation
{
public:
    RadioStation(); // creates a radio station


    // "set" methods
    void setName(const std::string& n) {name = n;};
    void setTracksToBroadcast();
    void setTopTracks();
    void setUsers();


    // "get" methods
    std::string getName() const {return name;};
    Playlist getTTBroadcast() const {return tracksToBroadcast;};
    Playlist getTopTracks() const {return topTracks;};
    std::vector<User> getUsers() const {return radioUsers;};


    // other
    void addUser(User u); // adds a new listener to a previously created r station
    void createTopTenFile();
    void showTopTracks() const; //  show top ten tracks
    void createNewUser();


    // radio station menus
    void firstLaunch();
    void userAccount(const std::string& lineWithUserInfo);
    void userOptions(); -> Function which requires the "showPlaylist" function
    void login();
    void signup();
    void mainMenu();




private:
    std::string name;
    Playlist tracksToBroadcast;
    Playlist topTracks;
    std::vector<User> radioUsers;


};