text: #ifndef MPI_DATA_H
  #define MPI_DATA_H
  
  class my_t_data{
  public:
      int rank;
      int numtasks;
      int chunk;
      my_t_data(int rank, int numtasks, int chunk) : rank(rank), numtasks(numtasks), chunk(chunk){}
  };
  #endif /* MPI_DATA_H */
  