/in/foo.cc: In member function 'int DateTime::Compare(int, int, int, int, int, int)':
/in/foo.cc:137:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^
/in/foo.cc: In member function 'int Date::Compare(int, int, int)':
/in/foo.cc:97:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^
/in/foo.cc: In member function 'int Time::Compare(int, int, int)':
/in/foo.cc:40:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^