Question:
Is there a way to do some macro magic with members of a given class sothat when a designated name is called, itinvokes the macro that called the class member,such as:
class Point{ int x,y;public: void Set_X(int n){x=n;} int Get_X(){return x;} … etc …};#define PROPERTY(name,read,write)………..//use macro on point classPROPERTY(X,Get_X,Set_X);…. Point p; //declare an object int x; x = p.X; // macro inserts p.Get_X() here p.X = x; // macro inserts p.Set_X(x) here
Answer:
No, there is no way to make a macro do what you are looking for,but another technique can be used here if you absoulutely must do that.
class Point{public: const int &x; const int &y; Point (int xc,int yc) : x(x_),y(y_),x_(xc),y_(yc) { }private: int x_; int y_;};Here I have declared two references to integers that are initialized with thevalues of x_ and y_ so they can be accessed as read-only variables ofthe object. This of course only works for the simplest of cases andshould be avoided as much as possiable.The C++ language does not provide a simple mechanism to do this, so it is necessary to write the get/set routines for properties of a class. If it is any consolation, you can choose to name the get/set method the same. For example:
class Point{public: Point (int xc,int yc) : x_(xc),y_(yc) { } void x(const int xc){x_ = xc;} int x() const { return x_;}private: int x_; int y_;};This looks a lot better than setX and getX.
