foo.cc: In constructor ‘Person::Person(const std::string&, int, int, int, int, int, int)’:
foo.cc:27:10: warning: ‘Person::l’ will be initialized after [-Wreorder]
   27 |     Date l;
      |          ^
foo.cc:25:12: warning:   ‘std::string Person::n’ [-Wreorder]
   25 |     string n;
      |            ^
foo.cc:29:5: warning:   when initialized here [-Wreorder]
   29 |     Person(const string &_n, int y1, int m1, int d1, int y2, int m2, int d2)
      |     ^~~~~~