/tmp/ccMqNMfJ.o: In function `Date::number_by_date()':
main.cpp:(.text._ZN4Date14number_by_dateEv[_ZN4Date14number_by_dateEv]+0x506): undefined reference to `Date::not_leap'
main.cpp:(.text._ZN4Date14number_by_dateEv[_ZN4Date14number_by_dateEv]+0x553): undefined reference to `Date::not_leap'
/tmp/ccMqNMfJ.o: In function `Date::date_by_number(int)':
main.cpp:(.text._ZN4Date14date_by_numberEi[_ZN4Date14date_by_numberEi]+0x604): undefined reference to `Date::not_leap'
main.cpp:(.text._ZN4Date14date_by_numberEi[_ZN4Date14date_by_numberEi]+0x654): undefined reference to `Date::not_leap'
main.cpp:(.text._ZN4Date14date_by_numberEi[_ZN4Date14date_by_numberEi]+0x676): undefined reference to `Date::not_leap'
collect2: error: ld returned 1 exit status
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