1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2014-2016 PALO, Richard. 14 */ 15 16 #ifndef _SYS_NULL_H 17 #define _SYS_NULL_H 18 19 #include <sys/feature_tests.h> 20 21 #ifndef NULL 22 23 /* 24 * POSIX.1-2008 requires that the NULL macro be cast to type void *. 25 * Historically, this has not been done, so we only enable this in a 26 * POSIX.1-2008 compilation environment. 27 */ 28 29 #if defined(_XPG7) && !defined(__cplusplus) 30 #define NULL ((void *)0) 31 #else 32 33 /* 34 * ISO C++ requires that the NULL macro be a constant integral type evaluating 35 * to zero until C++11, and an integer or pointer literal with value zero from 36 * C++11 onwards. 37 */ 38 39 #if defined(__cplusplus) && __cplusplus >= 201103L 40 #define NULL nullptr 41 #else 42 #if defined(_LP64) 43 #define NULL 0L 44 #else 45 #define NULL 0 46 #endif /* _LP64 */ 47 #endif /* C++11 */ 48 #endif /* _XPG7 */ 49 50 #endif /* NULL */ 51 52 #endif /* _SYS_NULL_H */ 53