[Compile-time Error] Template with operator overloading #2
Description
Error:LNK2019 "class std::basic_ostream<char,struct std::char_traits > & __cdecl operator<<(class std::basic_ostream<char,struct std::char_traits > &,class complex_number const &)" (??6@YAAEAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AEAV01@AEBV?$complex_number@M@@@z)main 함수에서 참조되는 확인할 수 없는 외부 기호