typedef

#include <vector>
#include <string>

using namespace std;

class MyClass1{
public:
  typedef int id_type;
  id_type id;
};

class MyClass2{
public:
  typedef string id_type;
  id_type id;
};

template <typename T> class MyClassManager{
  typename T::id_type id;
  T actual_data;
};

main(){
}