#ifndef _PAGE_CLASS_#define _PAGE_CLASS_#include <string>#include <vector>using namespace std;typedef struct{    string text;}Display;typedef void (*KeyAction)(void *); class page{      int code;      Display display;      vector<KeyAction> fun;             public:      page();      page(int index,Display something);      ~page();             void show(void);};#define UP    0#define DOWN  1#define RIGHT 2 #define LEFT  3#endif// end of file ---------------------------------------