18 Concepts library [concepts]

18.4 Language-related concepts [concepts.lang]

18.4.3 Concept derived_from [concept.derived]

template<class Derived, class Base>
  concept derived_from =
    is_base_of_v<Base, Derived> &&
    is_convertible_v<const volatile Derived*, const volatile Base*>;

[Note 1:

derived_from<Derived, Base> is satisfied if and only if Derived is publicly and unambiguously derived from Base, or Derived and Base are the same class type ignoring cv-qualifiers.

— end note]