std::experimental::ranges::Semiregular
Min standard notice:
Header: <experimental/ranges/concepts>
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 ==.
# Declarations
template< class T >
concept bool Semiregular = Copyable<T> && DefaultConstructible<T>;
(ranges TS)