17 Concepts library [concepts]

17.6 Object concepts [concepts.object]

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This subclause describes concepts that specify the basis of the value-oriented programming style on which the library is based.
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template<class T> concept Movable = is_object_v<T> && MoveConstructible<T> && Assignable<T&, T> && Swappable<T>; template<class T> concept Copyable = CopyConstructible<T> && Movable<T> && Assignable<T&, const T&>; template<class T> concept Semiregular = Copyable<T> && DefaultConstructible<T>; template<class T> concept Regular = Semiregular<T> && EqualityComparable<T>;
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[ Note
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The Semiregular concept is satisfied by types that behave similarly to built-in types like int, except that they might not be comparable with ==.
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[ Note
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The Regular concept is satisfied by types that behave similarly to built-in types like int and that are comparable with ==.
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