# libkern ``` namespace libkern; ``` ## Topics ### Namespaces [`namespace bar_detail;`](/documentation/DriverKit/libkern/bar_detail) [`namespace detail;`](/documentation/DriverKit/libkern/detail) [`namespace sa_detail;`](/documentation/DriverKit/libkern/sa_detail) ### Structures [`struct adopt_memory_t;`](/documentation/DriverKit/libkern/adopt_memory_t) [`struct allocate_memory_t;`](/documentation/DriverKit/libkern/allocate_memory_t) [`struct allocate_memory_zero_t;`](/documentation/DriverKit/libkern/allocate_memory_zero_t) [`template struct bounded_array;`](/documentation/DriverKit/libkern/bounded_array) [`template struct bounded_array_ref;`](/documentation/DriverKit/libkern/bounded_array_ref) [`template struct bounded_ptr;`](/documentation/DriverKit/libkern/bounded_ptr) [`template struct safe_allocation;`](/documentation/DriverKit/libkern/safe_allocation) ### Variables [`constexpr const adopt_memory_t adopt_memory;`](/documentation/DriverKit/libkern/adopt_memory) [`constexpr const allocate_memory_t allocate_memory;`](/documentation/DriverKit/libkern/allocate_memory) [`constexpr const allocate_memory_zero_t allocate_memory_zero;`](/documentation/DriverKit/libkern/allocate_memory_zero) ### Functions [`template bool operator!=(const bounded_ptr & p, detail::nullptr_t );`](/documentation/DriverKit/libkern/operator!=-1mtzc) [`template bool operator!=(detail::nullptr_t , const bounded_ptr & p);`](/documentation/DriverKit/libkern/operator!=-40y7m) [`template > bool operator!=(U * *a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator!=-4tle6) [`template > bool operator!=(const bounded_ptr & a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator!=-59rjh) [`template bool operator!=(sa_detail::nullptr_t , const safe_allocation & x);`](/documentation/DriverKit/libkern/operator!=-5trzj) [`template bool operator!=(bar_detail::nullptr_t , const bounded_array_ref & x);`](/documentation/DriverKit/libkern/operator!=-6fqjk) [`template bool operator!=(const bounded_array_ref & x, bar_detail::nullptr_t );`](/documentation/DriverKit/libkern/operator!=-ayak) [`template bool operator!=(const safe_allocation & x, sa_detail::nullptr_t );`](/documentation/DriverKit/libkern/operator!=-enw1) [`template > bool operator!=(const bounded_ptr & a, U * *b);`](/documentation/DriverKit/libkern/operator!=-isyz) [`bounded_ptr operator+(bounded_ptr p, ptrdiff_t n);`](/documentation/DriverKit/libkern/operator+-6jedg) [`bounded_ptr operator+(ptrdiff_t n, bounded_ptr p);`](/documentation/DriverKit/libkern/operator+-xw3o) [`ptrdiff_t operator-(const bounded_ptr & a, const type-parameter-0-0 *b);`](/documentation/DriverKit/libkern/operator--16kds) [`bounded_ptr operator-(bounded_ptr p, ptrdiff_t n);`](/documentation/DriverKit/libkern/operator--21659) [`ptrdiff_t operator-(const type-parameter-0-0 *a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator--4anod) [`ptrdiff_t operator-(const bounded_ptr & a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator--56d6m) [`template > bool operator==(U * *a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator==-15jrb) [`template bool operator==(const bounded_array_ref & x, bar_detail::nullptr_t );`](/documentation/DriverKit/libkern/operator==-3uipa) [`template bool operator==(const safe_allocation & x, sa_detail::nullptr_t );`](/documentation/DriverKit/libkern/operator==-510e0) [`template bool operator==(bar_detail::nullptr_t , const bounded_array_ref & x);`](/documentation/DriverKit/libkern/operator==-58o3l) [`template > bool operator==(const bounded_ptr & a, U * *b);`](/documentation/DriverKit/libkern/operator==-6j7ha) [`template bool operator==(detail::nullptr_t , const bounded_ptr & p);`](/documentation/DriverKit/libkern/operator==-6xlju) [`template bool operator==(sa_detail::nullptr_t , const safe_allocation & x);`](/documentation/DriverKit/libkern/operator==-6y20q) [`template bool operator==(const bounded_ptr & p, detail::nullptr_t );`](/documentation/DriverKit/libkern/operator==-8elxo) [`template > bool operator==(const bounded_ptr & a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator==-96xsq) [`template > bool operator>(T * *a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator_-1teoa) [`template > bool operator<(T * *a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator_-360qk) [`template > bool operator<(const bounded_ptr & a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator_-5tucm) [`template > bool operator>(const bounded_ptr & a, U * *b);`](/documentation/DriverKit/libkern/operator_-6mjvi) [`template > bool operator>(const bounded_ptr & a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator_-89g32) [`template > bool operator<(const bounded_ptr & a, U * *b);`](/documentation/DriverKit/libkern/operator_-8o5ii) [`template > bool operator>=(const bounded_ptr & a, U * *b);`](/documentation/DriverKit/libkern/operator_=-18t07) [`template > bool operator<=(T * *a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator_=-1fv9b) [`template > bool operator<=(const bounded_ptr & a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator_=-1hoqx) [`template > bool operator>=(const bounded_ptr & a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator_=-48u68) [`template > bool operator>=(T * *a, const bounded_ptr & b);`](/documentation/DriverKit/libkern/operator_=-6ysww) [`template > bool operator<=(const bounded_ptr & a, U * *b);`](/documentation/DriverKit/libkern/operator_=-8131f) [`template bounded_ptr reinterpret_pointer_cast(const bounded_ptr & ) noexcept;`](/documentation/DriverKit/libkern/reinterpret_pointer_cast-1viq2) [`template T * *reinterpret_pointer_cast(U * *p) noexcept;`](/documentation/DriverKit/libkern/reinterpret_pointer_cast-61y44) [`template bounded_ptr reinterpret_pointer_cast(const bounded_ptr & p) noexcept;`](/documentation/DriverKit/libkern/reinterpret_pointer_cast-7u0yk) [`void swap(safe_allocation & a, safe_allocation & b) noexcept;`](/documentation/DriverKit/libkern/swap) --- Copyright © 2026 Apple Inc. 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