30 Thread support library [thread]

30.2 Requirements [thread.req]

30.2.3 Native handles [thread.req.native]

Several classes described in this Clause have members native_handle_type and native_handle. The presence of these members and their semantics is implementation-defined. [ Note: These members allow implementations to provide access to implementation details. Their names are specified to facilitate portable compile-time detection. Actual use of these members is inherently non-portable.  — end note ]