include/sys/stdbool.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_STDBOOL_H
  28 #define _SYS_STDBOOL_H
  29
  30 /*
  31  * This header is included for alignment with the ISO/IEC 9899:1999 standard.
  32  * The contents are only visible when using a c99 compiler. In the case of
  33  * the Sun compiler, some C99 features, including the _Bool built-in type,
  34  * are provided in the default compilation mode. This is a subset of what
  35  * is provided when __STDC_VERSION__ is 199901; hence the contents of this
  36  * header are made visible when either __STDC_VERSION__ >= 199901 (_STDC_C99
  37  * as defined in sys/feature_tests.h) or if __C99FEATURES__ (a Sun compiler
  38  * built-in) is defined. Likewise for GNU C, support for C99 features,
  39  * including this header, is provided in versions 3.0 or greater. In no
  40  * case should the contents of this header be visible in a C++ build
  41  * environment.
  42  *
  43  * Note that the ability to undefine and redefine the macros bool,
  44  * true, and false  is an obsolescent feature which may be withdrawn
  45  * in a future version of the standards specifications.
  46  */
  47
  48 #include <sys/feature_tests.h>
  49
  50 #ifndef __cplusplus
  51 #if defined(_STDC_C99) || defined(__C99FEATURES__) || __GNUC__ >= 3
  52
  53 #undef  bool
  54 #undef  true
  55 #undef  false
  56
  57 #define bool    _Bool
  58 #define true    1
  59 #define false   0
  60
  61 #define __bool_true_false_are_defined   1
  62
  63 #endif /* defined(_STDC_C99) || defined(__C99FEATURES__) || __GNUC__ >= 3 */
  64 #endif /* __cplusplus */
  65
  66 #endif /* !_SYS_STDBOOL_H */