# detail ``` namespace detail; ``` ## Topics ### Structures [`template struct copy_const;`](/documentation/DriverKit/libkern/detail/copy_const-1exuz) [`template struct copy_const;`](/documentation/DriverKit/libkern/detail/copy_const-4q5fz) [`template struct copy_cv;`](/documentation/DriverKit/libkern/detail/copy_cv-1me4m) [`template struct copy_cv;`](/documentation/DriverKit/libkern/detail/copy_cv-40ywj) [`template struct copy_cv;`](/documentation/DriverKit/libkern/detail/copy_cv-8218o) [`template struct copy_cv;`](/documentation/DriverKit/libkern/detail/copy_cv-8ivn5) [`template struct enable_if<1, T>;`](/documentation/DriverKit/libkern/detail/enable_if) ### Variables [`template constexpr const _Bool is_convertible_v;`](/documentation/DriverKit/libkern/detail/is_convertible_v) [`template constexpr const _Bool is_void_v;`](/documentation/DriverKit/libkern/detail/is_void_v-5juu3) [`template <> constexpr const _Bool is_void_v;`](/documentation/DriverKit/libkern/detail/is_void_v-5zqvq) [`template <> constexpr const _Bool is_void_v;`](/documentation/DriverKit/libkern/detail/is_void_v-9qbb9) [`template <> constexpr const size_t sizeof_v;`](/documentation/DriverKit/libkern/detail/sizeof_v-49yp1) [`template constexpr const size_t sizeof_v;`](/documentation/DriverKit/libkern/detail/sizeof_v-4fgxf) [`template <> constexpr const size_t sizeof_v;`](/documentation/DriverKit/libkern/detail/sizeof_v-5gvyf) [`template <> constexpr const size_t sizeof_v;`](/documentation/DriverKit/libkern/detail/sizeof_v-5gw9n) [`template <> constexpr const size_t sizeof_v;`](/documentation/DriverKit/libkern/detail/sizeof_v-5gwkj) ### Functions [`template T && && declval() noexcept;`](/documentation/DriverKit/libkern/detail/declval) ### Type Aliases [`typedef void_t() == declval()), decltype(declval() != declval())> WhenComparable;`](/documentation/DriverKit/libkern/detail/WhenComparable) [`typedef void_t() < declval()), decltype(declval() > declval()), decltype(declval() >= declval()), decltype(declval() <= declval())> WhenOrderable;`](/documentation/DriverKit/libkern/detail/WhenOrderable) [`typedef copy_const::type copy_const_t;`](/documentation/DriverKit/libkern/detail/copy_const_t) [`typedef copy_cv::type copy_cv_t;`](/documentation/DriverKit/libkern/detail/copy_cv_t) [`typedef enable_if::type enable_if_t;`](/documentation/DriverKit/libkern/detail/enable_if_t) [`typedef nullptr_t nullptr_t;`](/documentation/DriverKit/libkern/detail/nullptr_t) [`typedef void void_t;`](/documentation/DriverKit/libkern/detail/void_t) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)