C++のenum class - 覚えてること全部書きたい

C++のenum class

整数型への暗黙の型変換を行わない

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#enum3-prefer-class-enums-over-plain-enums

https://cpprefjp.github.io/lang/cpp11/scoped_enum.html

https://en.cppreference.com/w/cpp/language/enum#Scoped_enumerations