std::Semiregular (3) Linux Manual Page

std::Semiregular – std::Semiregular

Synopsis

Defined in header <concepts>

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

concept Semiregular = std::Copyable<T> && std::DefaultConstructible<T>;

The Semiregular concept specifies that a type is both copyable and default constructible. It is satisfied by types that behave similarly to built-in types like int, except that they need not support comparison with ==.