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Introduced in CPP11, CPP Underlying Type extracts the underlying integer type of an enumeration type using `std::underlying_type`. It supports type-safe casting in enum-based APIs.

CPP Underlying Type is commonly used in binary serialization, enum-based flags, and custom type mapping. It ensures reliable conversions between enums and integral types.

https://en.cppreference.com/w/cpp/types/underlying_type