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| 1 /* -*- buffer-read-only: t -*- vi: set ro: */ |
| 2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */ |
| 3 /* Copyright (C) 2001-2003, 2006-2008 Free Software Foundation, Inc. |
| 4 Written by Bruno Haible <haible@clisp.cons.org>, 2001. |
| 5 |
| 6 This program is free software; you can redistribute it and/or modify |
| 7 it under the terms of the GNU General Public License as published by |
| 8 the Free Software Foundation; either version 3, or (at your option) |
| 9 any later version. |
| 10 |
| 11 This program is distributed in the hope that it will be useful, |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 GNU General Public License for more details. |
| 15 |
| 16 You should have received a copy of the GNU General Public License |
| 17 along with this program; if not, write to the Free Software Foundation, |
| 18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 19 |
| 20 #ifndef _GL_STDBOOL_H |
| 21 #define _GL_STDBOOL_H |
| 22 |
| 23 /* ISO C 99 <stdbool.h> for platforms that lack it. */ |
| 24 |
| 25 /* Usage suggestions: |
| 26 |
| 27 Programs that use <stdbool.h> should be aware of some limitations |
| 28 and standards compliance issues. |
| 29 |
| 30 Standards compliance: |
| 31 |
| 32 - <stdbool.h> must be #included before 'bool', 'false', 'true' |
| 33 can be used. |
| 34 |
| 35 - You cannot assume that sizeof (bool) == 1. |
| 36 |
| 37 - Programs should not undefine the macros bool, true, and false, |
| 38 as C99 lists that as an "obsolescent feature". |
| 39 |
| 40 Limitations of this substitute, when used in a C89 environment: |
| 41 |
| 42 - <stdbool.h> must be #included before the '_Bool' type can be used. |
| 43 |
| 44 - You cannot assume that _Bool is a typedef; it might be a macro. |
| 45 |
| 46 - Bit-fields of type 'bool' are not supported. Portable code |
| 47 should use 'unsigned int foo : 1;' rather than 'bool foo : 1;'. |
| 48 |
| 49 - In C99, casts and automatic conversions to '_Bool' or 'bool' are |
| 50 performed in such a way that every nonzero value gets converted |
| 51 to 'true', and zero gets converted to 'false'. This doesn't work |
| 52 with this substitute. With this substitute, only the values 0 and 1 |
| 53 give the expected result when converted to _Bool' or 'bool'. |
| 54 |
| 55 Also, it is suggested that programs use 'bool' rather than '_Bool'; |
| 56 this isn't required, but 'bool' is more common. */ |
| 57 |
| 58 |
| 59 /* 7.16. Boolean type and values */ |
| 60 |
| 61 /* BeOS <sys/socket.h> already #defines false 0, true 1. We use the same |
| 62 definitions below, but temporarily we have to #undef them. */ |
| 63 #if defined __BEOS__ && !defined __HAIKU__ |
| 64 # include <OS.h> /* defines bool but not _Bool */ |
| 65 # undef false |
| 66 # undef true |
| 67 #endif |
| 68 |
| 69 /* For the sake of symbolic names in gdb, we define true and false as |
| 70 enum constants, not only as macros. |
| 71 It is tempting to write |
| 72 typedef enum { false = 0, true = 1 } _Bool; |
| 73 so that gdb prints values of type 'bool' symbolically. But if we do |
| 74 this, values of type '_Bool' may promote to 'int' or 'unsigned int' |
| 75 (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int' |
| 76 (see ISO C 99 6.3.1.1.(2)). So we add a negative value to the |
| 77 enum; this ensures that '_Bool' promotes to 'int'. */ |
| 78 #if defined __cplusplus || (defined __BEOS__ && !defined __HAIKU__) |
| 79 /* A compiler known to have 'bool'. */ |
| 80 /* If the compiler already has both 'bool' and '_Bool', we can assume they |
| 81 are the same types. */ |
| 82 # if !@HAVE__BOOL@ |
| 83 typedef bool _Bool; |
| 84 # endif |
| 85 #else |
| 86 # if !defined __GNUC__ |
| 87 /* If @HAVE__BOOL@: |
| 88 Some HP-UX cc and AIX IBM C compiler versions have compiler bugs when |
| 89 the built-in _Bool type is used. See |
| 90 http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html |
| 91 http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html |
| 92 http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html |
| 93 Similar bugs are likely with other compilers as well; this file |
| 94 wouldn't be used if <stdbool.h> was working. |
| 95 So we override the _Bool type. |
| 96 If !@HAVE__BOOL@: |
| 97 Need to define _Bool ourselves. As 'signed char' or as an enum type? |
| 98 Use of a typedef, with SunPRO C, leads to a stupid |
| 99 "warning: _Bool is a keyword in ISO C99". |
| 100 Use of an enum type, with IRIX cc, leads to a stupid |
| 101 "warning(1185): enumerated type mixed with another type". |
| 102 Even the existence of an enum type, without a typedef, |
| 103 "Invalid enumerator. (badenum)" with HP-UX cc on Tru64. |
| 104 The only benefit of the enum, debuggability, is not important |
| 105 with these compilers. So use 'signed char' and no enum. */ |
| 106 # define _Bool signed char |
| 107 # else |
| 108 /* With this compiler, trust the _Bool type if the compiler has it. */ |
| 109 # if !@HAVE__BOOL@ |
| 110 typedef enum { _Bool_must_promote_to_int = -1, false = 0, true = 1 } _Bool; |
| 111 # endif |
| 112 # endif |
| 113 #endif |
| 114 #define bool _Bool |
| 115 |
| 116 /* The other macros must be usable in preprocessor directives. */ |
| 117 #define false 0 |
| 118 #define true 1 |
| 119 #define __bool_true_false_are_defined 1 |
| 120 |
| 121 #endif /* _GL_STDBOOL_H */ |
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