与c++模板有点混淆

我有以下内容:

        extern Keyboard keyboard;
        enum DEVICETYPE
        {
            KEYBOARD,
            MOUSE,
            CONTROLLER,
            TOUCH
        };
        template <typename T>
        class PlayerInputDevice
        {
        public:
            void SetDevice( DEVICETYPE deviceType )
            {
                switch( deviceType )
                {
                case KEYBOARD:
                    Device = &keyboard;
                    break;
                }
            }
            T Device;
        };

我得到编译错误:

Error   1   error C2955: 'Game::Model::Input::PlayerInputDevice' : use of class template requires template argument list (ConcretePlayer.cpp)  c:usersjamesdocumentsvisual studio 2013projectsgamesjimmymodelconcreteplayer.h    29  1   Model
Error   2   error C2512: 'Game::Model::Input::PlayerInputDevice' : no appropriate default constructor available c:usersjamesdocumentsvisual studio 2013projectsgamesjimmymodelconcreteplayer.cpp  8   1   Model
Error   6   error C2955: 'Game::Model::Input::PlayerInputDevice' : use of class template requires template argument list    c:usersjamesdocumentsvisual studio 2013projectsgamesjimmymodelconcreteplayer.h    29  1   Game
        7   IntelliSense: argument list for class template "Game::Model::Input::PlayerInputDevice" is missing   c:UsersJamesDocumentsVisual Studio 2013ProjectsGamesJimmyModelConcretePlayer.h    29  5   Model

不确定我是否理解正确?

我希望能够这样说:

class Player
{
public:    
    PlayerInputDevice PlayerInputDevice;
}
...
player.PlayerInputDevice.SetDevice( KEYBOARD );
player.PlayerInputDevice.IsUpPressed();