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 */ 26 27 #if !defined(__cplusplus) 28 #define NULL ((void *)0) 29 #else 30 31 /* 32 * ISO C++ requires that the NULL macro be a constant integral type evaluating 33 * to zero until C++11, and an integer or pointer literal with value zero from 34 * C++11 onwards. 35 */ 36 37 #if __cplusplus >= 201103L 38 #define NULL nullptr 39 #else 40 #if defined(_LP64) 41 #define NULL 0L 42 #else 43 #define NULL 0 44 #endif /* _LP64 */ 45 #endif /* C++11 */ 46 #endif /* !__cplusplus */ 47 48 #endif /* NULL */ 49 50 #endif /* _SYS_NULL_H */ 51