/in/foo.cc: In member function 'void Person::printInfo() const':
/in/foo.cc:34:45: error: 'int Date::year_' is private within this context
         std::cout << name_ << ' ' << birth_.year_ << '-' << birth_.month_ << '-' << birth_.day_
                                             ^~~~~
/in/foo.cc:17:9: note: declared private here
     int year_, month_, day_;
         ^~~~~
/in/foo.cc:34:68: error: 'int Date::month_' is private within this context
         std::cout << name_ << ' ' << birth_.year_ << '-' << birth_.month_ << '-' << birth_.day_
                                                                    ^~~~~~
/in/foo.cc:17:16: note: declared private here
     int year_, month_, day_;
                ^~~~~~
/in/foo.cc:34:92: error: 'int Date::day_' is private within this context
         std::cout << name_ << ' ' << birth_.year_ << '-' << birth_.month_ << '-' << birth_.day_
                                                                                            ^~~~
/in/foo.cc:17:24: note: declared private here
     int year_, month_, day_;
                        ^~~~
/in/foo.cc:35:36: error: 'int Date::year_' is private within this context
                   << ' ' << leave_.year_ << '-' << leave_.month_ << '-' << leave_.day_ << std::endl;
                                    ^~~~~
/in/foo.cc:17:9: note: declared private here
     int year_, month_, day_;
         ^~~~~
/in/foo.cc:35:59: error: 'int Date::month_' is private within this context
                   << ' ' << leave_.year_ << '-' << leave_.month_ << '-' << leave_.day_ << std::endl;
                                                           ^~~~~~
/in/foo.cc:17:16: note: declared private here
     int year_, month_, day_;
                ^~~~~~
/in/foo.cc:35:83: error: 'int Date::day_' is private within this context
                   << ' ' << leave_.year_ << '-' << leave_.month_ << '-' << leave_.day_ << std::endl;
                                                                                   ^~~~
/in/foo.cc:17:24: note: declared private here
     int year_, month_, day_;
                        ^~~~
/in/foo.cc: In function 'bool comparePersonAge(const Person&, const Person&)':
/in/foo.cc:47:14: error: 'Date Person::birth_' is private within this context
     return a.birth_.year_ < b.birth_.year_ ||
              ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:47:21: error: 'int Date::year_' is private within this context
     return a.birth_.year_ < b.birth_.year_ ||
                     ^~~~~
/in/foo.cc:17:9: note: declared private here
     int year_, month_, day_;
         ^~~~~
/in/foo.cc:47:31: error: 'Date Person::birth_' is private within this context
     return a.birth_.year_ < b.birth_.year_ ||
                               ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:47:38: error: 'int Date::year_' is private within this context
     return a.birth_.year_ < b.birth_.year_ ||
                                      ^~~~~
/in/foo.cc:17:9: note: declared private here
     int year_, month_, day_;
         ^~~~~
/in/foo.cc:48:15: error: 'Date Person::birth_' is private within this context
            (a.birth_.year_ == b.birth_.year_ && (a.birth_.month_ < b.birth_.month_ ||
               ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:48:22: error: 'int Date::year_' is private within this context
            (a.birth_.year_ == b.birth_.year_ && (a.birth_.month_ < b.birth_.month_ ||
                      ^~~~~
/in/foo.cc:17:9: note: declared private here
     int year_, month_, day_;
         ^~~~~
/in/foo.cc:48:33: error: 'Date Person::birth_' is private within this context
            (a.birth_.year_ == b.birth_.year_ && (a.birth_.month_ < b.birth_.month_ ||
                                 ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:48:40: error: 'int Date::year_' is private within this context
            (a.birth_.year_ == b.birth_.year_ && (a.birth_.month_ < b.birth_.month_ ||
                                        ^~~~~
/in/foo.cc:17:9: note: declared private here
     int year_, month_, day_;
         ^~~~~
/in/foo.cc:48:52: error: 'Date Person::birth_' is private within this context
            (a.birth_.year_ == b.birth_.year_ && (a.birth_.month_ < b.birth_.month_ ||
                                                    ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:48:59: error: 'int Date::month_' is private within this context
            (a.birth_.year_ == b.birth_.year_ && (a.birth_.month_ < b.birth_.month_ ||
                                                           ^~~~~~
/in/foo.cc:17:16: note: declared private here
     int year_, month_, day_;
                ^~~~~~
/in/foo.cc:48:70: error: 'Date Person::birth_' is private within this context
            (a.birth_.year_ == b.birth_.year_ && (a.birth_.month_ < b.birth_.month_ ||
                                                                      ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:48:77: error: 'int Date::month_' is private within this context
            (a.birth_.year_ == b.birth_.year_ && (a.birth_.month_ < b.birth_.month_ ||
                                                                             ^~~~~~
/in/foo.cc:17:16: note: declared private here
     int year_, month_, day_;
                ^~~~~~
/in/foo.cc:49:52: error: 'Date Person::birth_' is private within this context
                                                 (a.birth_.month_ == b.birth_.month_ && a.birth_.day_ < b.birth_.day_)));
                                                    ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:49:59: error: 'int Date::month_' is private within this context
                                                 (a.birth_.month_ == b.birth_.month_ && a.birth_.day_ < b.birth_.day_)));
                                                           ^~~~~~
/in/foo.cc:17:16: note: declared private here
     int year_, month_, day_;
                ^~~~~~
/in/foo.cc:49:71: error: 'Date Person::birth_' is private within this context
                                                 (a.birth_.month_ == b.birth_.month_ && a.birth_.day_ < b.birth_.day_)));
                                                                       ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:49:78: error: 'int Date::month_' is private within this context
                                                 (a.birth_.month_ == b.birth_.month_ && a.birth_.day_ < b.birth_.day_)));
                                                                              ^~~~~~
/in/foo.cc:17:16: note: declared private here
     int year_, month_, day_;
                ^~~~~~
/in/foo.cc:49:90: error: 'Date Person::birth_' is private within this context
                                                 (a.birth_.month_ == b.birth_.month_ && a.birth_.day_ < b.birth_.day_)));
                                                                                          ^~~~~~
/in/foo.cc:40:10: note: declared private here
     Date birth_, leave_;
          ^~~~~~
/in/foo.cc:49:97: error: 'int Date::day_' is private within this context
                                                 (a.birth_.month_ == b.birth_.month_ && a.birth_.day_ < b.birth_.day_)));
                                                                                                 ^~~~
/in/foo.cc:17:24: note: declared private here
     int year_, month_, day_;
                        ^~~~
/in/foo.cc:49:106: error: 'Date Person::birth_' is private within this context
                                                 (a.birth_.month_ == b.birth_.month_ && a.birth_.day_ < b.birth_.day_)));
                                                                                                          ^~~~~