std::Regular (3) Linux Manual Page

std::Regular – std::Regular

Synopsis

Defined in header <concepts>

template <class T>                                                    (since C++20)

concept Regular = std::Semiregular<T> && std::EqualityComparable<T>;

The Regular concept specifies that a type is regular, that is, it is copyable, default constructible, and equality comparable. It is satisfied by types that behave similarly to built-in types like int, and that are comparable with ==.