#include <string>
#include <thread>

void
open_document_and_display_gui(std::string const& filename)
{
}

bool
done_editing()
{
  return true;
}

enum command_type { open_new_document };

struct user_command {
  command_type type;

  user_command() : type(open_new_document) {}
};

user_command
get_user_input()
{
  return user_command();
}

std::string
get_filename_from_user()
{
  return "foo.doc";
}

void
process_user_input(user_command const& cmd)
{
}

void
edit_document(std::string const& filename)
{
  open_document_and_display_gui(filename);
  while (!done_editing()) {
    user_command cmd = get_user_input();
    if (cmd.type == open_new_document) {
      std::string const new_name = get_filename_from_user();
      std::thread t(edit_document, new_name);
      t.detach();
    }
    else {
      process_user_input(cmd);
    }
  }
}

int
main()
{
  edit_document("bar.doc");
}