cuda kernel member function

member.cu

#include <stdio.h>

class A{

    int data;
  public:
    A() { data = 0;}
    __host__ __device__
    void increment()  { data++;}
    __host__ __device__
    void print_data() { printf("data = %d\n", data);}
};

__global__ void test(A a){

  a.increment();
  a.print_data();
}

int main(){

  A h_a;
  h_a.increment();
  h_a.print_data();
  test<<<1,1>>>(h_a);
  cudaDeviceSynchronize();
}

I have 2 questions

1. I have no problem with int data[10] as member variable but How can I use member variable like int* ?
2. How can I transfer class definition and Implementation to other file and include it in the main file? I got some strange error !