18 Concepts library [concepts]

18.6 Object concepts [concepts.object]

1
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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> && move_constructible<T> && assignable_­from<T&, T> && swappable<T>; template<class T> concept copyable = copy_­constructible<T> && movable<T> && assignable_­from<T&, T&> && assignable_­from<T&, const T&> && assignable_­from<T&, const T>; template<class T> concept semiregular = copyable<T> && default_initializable<T>; template<class T> concept regular = semiregular<T> && equality_comparable<T>;
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[Note
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The semiregular concept is modeled by types that behave similarly to built-in types like int, except that they might not be comparable with ==.
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3
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[Note
:
The regular concept is modeled by types that behave similarly to built-in types like int and that are comparable with ==.
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]