Is there a way of applying a function to each member of a struct in c++?

Question

You have a simple struct, say:

typedef struct rect
{
    int x;
    int y;
    int width;
    int height;
}
rect;

And you want to multiply

Answer 1

If all are the same type, use a union combined with an anonymous struct, inside of your struct:

struct MyStruct {
  union {
    int data[4];
    struct {
      int x,y,z,w;
    }
  };
};

then:

MyStruct my_struct;
cout << my_struct.x << my_struct.y << my_struct.z << my_struct.w;
for (size_t i = 0; i < 4; ++i)
  some_function(my_struct.data[i]); // access the data via "data" member
cout << my_struct.x << my_struct.y << my_struct.z << my_struct.w; // voila!, stryct data has changed!

If youre using different types have a look at boost::fusion