18 Concepts library [concepts]

18.4 Language-related concepts [concepts.lang]

18.4.3 Concept derived_­from [concept.derived]

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