text: #pragma once
  
  class HostDeviceHandler
  {
  public:
      void* h_data;
      void* d_data;
      char  element_sz;  //char num per element
      int   sz;          //element num
  };
  
  class SortHandler
  {
  public:
      void* data;
      void* sorted_data;
      char  element_sz;  //char num per element
      int   sz;          //element num
  };
  