如何在實例創建時將實例本身傳遞給外部映射？

我有一個類對象和類型定義：如何在實例創建時將實例本身傳遞給外部映射？

class Object 
{ 
private: 
    long int id; 
public: 
    Object(void); 
    ~Object(void) {}; 
    long int get_id(void); 
}; 

typedef map<long int, Object> obj_map;

然後，我有這個類應用程序，它有一個obj_map和object_counter：

class App 
{ 
public: 
    static ALLEGRO_DISPLAY *display; 
    static ALLEGRO_EVENT_QUEUE *event_queue; 
    static ALLEGRO_TIMER *timer; 
    static ALLEGRO_EVENT e; 
    static bool running; 
    static bool redraw; 
    static key_map key_states; 
    static obj_map objects; // << Here. 
    static long int object_counter; // << Here. 
    const char *window_title; 
    int screen_width; 
    int screen_height; 
    float FPS; 
    act event_scenes; 
    act visual_scenes; 
    ALLEGRO_COLOR background_color; 

    static ALLEGRO_EVENT event(); 
    static ALLEGRO_EVENT_TYPE event_type(); 
    static void shut_down(); 

    App(int screen_width, int screen_height, const char *window_title = "Joy++ Application", float FPS = 30); 
    ~App() {}; 

    int init_all(); 
    void register_all(); 
    void check_key_states(); 
    void init_key_states(); 
    void run(); 
    void destroy_all(); 
    void add_event_scene(Scene scene); 
    void add_visual_scene(Scene scene); 
    void remove_event_scene(Scene scene); 
    void remove_visual_scene(Scene scene); 

    long int get_object_count(); 
    unsigned int get_random_int(unsigned int min, unsigned int max); 
    void set_key_state(int al_key, string key_name, bool state); 
    void set_background_color(int r, int g, int b); 
};

正如你所看到的，這個想法是存儲應用內的每個對象，位於地圖內的某個ID下。但是，我希望在創建每個對象時發生這種情況。因此，這裏的構造函數的定義：

Object::Object() 
{ 
    App::object_counter += 1; 
    this->id = App::object_counter; 
    App::objects[this->id] = this; // Problem. 
}

錯誤：

G:\Development\Game-Development\CB\Joy-Plus-Plus\app.cpp|26|error: no match for 'operator=' (operand types are 'std::map<long int, Object>::mapped_type {aka Object}' and 'Object* const')|

如何傳遞每個對象的實例本身的外部地圖在其創建的時刻？

來源

2015-06-19 Ericson Willians