I'm now stuck in the server I am programming, simply because I do not seem to find a good and realiable way to handle my single object classes, I've attempted the Singleton pattern but it is just plain ugly to have to type everything over and over again.I have this class TConnectionManager which basically handles all connection related code to the connections active to my server.Singleton Pattern - connections.hSingleton destructor would delete all connections left in Connections variableclass TConnectionManager{public:    std::list<TConnection*> Connections;private:    std::mutex ConnectionsLock;public:    static TConnectionManager& getInstance()    {        static TConnectionManager instance;        return instance;    }    TConnectionManager() = default;    ~TConnectionManager();    // non-copyable    TConnectionManager(const TConnectionManager&) = delete;    TConnectionManager& operator=(const TConnectionManager&) = delete;    TConnection* CreateConnection(boost::asio::io_service& IOService);    void ReleaseConnection(TConnection* Connection);    void ProcessConnections();};For me to have to type getInstance over and over again is getting frustrating as it is, so I tried to search around many places and could not come up with a better solution, and there's also many different point of views.I have attempted to do this, which seems way cleaner:C Like - connections.hWithout a real destructor, I'd have to call the ExitConnections method at the end of the program to delete all remaining active connections, or set the std::atexit methodextern std::list<TConnection*> Connections;extern std::mutex ConnectionsLock;TConnection* CreateConnection(boost::asio::io_service& IOService);void ReleaseConnection(TConnection* Connection);void ProcessConnections();void ExitConnections(); // Destructor alike function which deletes all connectionsAlso attempted to have a static class namespaceStatic methods and variables (namespace) - connections.hSame approach as for the C-Like methods and variables, use ExitConnections method act as a destructor to delete all remaining active connectionsclass TConnectionManager{public:    static std::list<TConnection*> Connections;private:    static std::mutex ConnectionsLock;public:    static TConnection* CreateConnection(boost::asio::io_service& IOService);    static void ReleaseConnection(TConnection* Connection);    static void ProcessConnections();    static void ExitConnections();};So I don't know which of the three ways later mentioned is the best approach to handle this situation I am stuck in.
C++ Which of the following is a better singleton pattern approach?
c++;variables;encapsulation;singleton