annotate lib/stdbool.in.h @ 40057:b06060465f09

maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
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1 /* Copyright (C) 2001-2003, 2006-2019 Free Software Foundation, Inc.
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2 Written by Bruno Haible <haible@clisp.cons.org>, 2001.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, see <https://www.gnu.org/licenses/>. */
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16
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17 #ifndef _GL_STDBOOL_H
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18 #define _GL_STDBOOL_H
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19
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20 /* ISO C 99 <stdbool.h> for platforms that lack it. */
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21
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22 /* Usage suggestions:
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23
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24 Programs that use <stdbool.h> should be aware of some limitations
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25 and standards compliance issues.
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26
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27 Standards compliance:
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28
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29 - <stdbool.h> must be #included before 'bool', 'false', 'true'
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30 can be used.
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31
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32 - You cannot assume that sizeof (bool) == 1.
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33
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34 - Programs should not undefine the macros bool, true, and false,
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35 as C99 lists that as an "obsolescent feature".
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36
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37 Limitations of this substitute, when used in a C89 environment:
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38
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39 - <stdbool.h> must be #included before the '_Bool' type can be used.
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40
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41 - You cannot assume that _Bool is a typedef; it might be a macro.
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42
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43 - Bit-fields of type 'bool' are not supported. Portable code
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44 should use 'unsigned int foo : 1;' rather than 'bool foo : 1;'.
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45
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46 - In C99, casts and automatic conversions to '_Bool' or 'bool' are
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47 performed in such a way that every nonzero value gets converted
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48 to 'true', and zero gets converted to 'false'. This doesn't work
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49 with this substitute. With this substitute, only the values 0 and 1
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50 give the expected result when converted to _Bool' or 'bool'.
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51
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52 - C99 allows the use of (_Bool)0.0 in constant expressions, but
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53 this substitute cannot always provide this property.
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54
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55 Also, it is suggested that programs use 'bool' rather than '_Bool';
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56 this isn't required, but 'bool' is more common. */
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57
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58
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59 /* 7.16. Boolean type and values */
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60
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61 /* BeOS <sys/socket.h> already #defines false 0, true 1. We use the same
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62 definitions below, but temporarily we have to #undef them. */
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63 #if defined __BEOS__ && !defined __HAIKU__
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64 # include <OS.h> /* defines bool but not _Bool */
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65 # undef false
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66 # undef true
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67 #endif
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68
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69 #ifdef __cplusplus
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70 # define _Bool bool
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71 # define bool bool
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72 #else
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73 # if defined __BEOS__ && !defined __HAIKU__
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74 /* A compiler known to have 'bool'. */
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75 /* If the compiler already has both 'bool' and '_Bool', we can assume they
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76 are the same types. */
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77 # if !@HAVE__BOOL@
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78 typedef bool _Bool;
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79 # endif
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80 # else
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81 # if !defined __GNUC__
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82 /* If @HAVE__BOOL@:
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83 Some HP-UX cc and AIX IBM C compiler versions have compiler bugs when
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84 the built-in _Bool type is used. See
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85 https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
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86 https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html
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87 https://lists.gnu.org/r/bug-coreutils/2005-10/msg00086.html
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88 Similar bugs are likely with other compilers as well; this file
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89 wouldn't be used if <stdbool.h> was working.
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90 So we override the _Bool type.
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91 If !@HAVE__BOOL@:
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92 Need to define _Bool ourselves. As 'signed char' or as an enum type?
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93 Use of a typedef, with SunPRO C, leads to a stupid
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94 "warning: _Bool is a keyword in ISO C99".
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95 Use of an enum type, with IRIX cc, leads to a stupid
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96 "warning(1185): enumerated type mixed with another type".
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97 Even the existence of an enum type, without a typedef,
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98 "Invalid enumerator. (badenum)" with HP-UX cc on Tru64.
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99 The only benefit of the enum, debuggability, is not important
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100 with these compilers. So use 'signed char' and no enum. */
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101 # define _Bool signed char
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102 # else
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103 /* With this compiler, trust the _Bool type if the compiler has it. */
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104 # if !@HAVE__BOOL@
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105 /* For the sake of symbolic names in gdb, define true and false as
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106 enum constants, not only as macros.
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107 It is tempting to write
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108 typedef enum { false = 0, true = 1 } _Bool;
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109 so that gdb prints values of type 'bool' symbolically. But then
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110 values of type '_Bool' might promote to 'int' or 'unsigned int'
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111 (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int'
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112 (see ISO C 99 6.3.1.1.(2)). So add a negative value to the
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113 enum; this ensures that '_Bool' promotes to 'int'. */
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114 typedef enum { _Bool_must_promote_to_int = -1, false = 0, true = 1 } _Bool;
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115 # endif
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116 # endif
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117 # endif
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118 # define bool _Bool
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119 #endif
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120
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121 /* The other macros must be usable in preprocessor directives. */
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122 #ifdef __cplusplus
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123 # define false false
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124 # define true true
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125 #else
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126 # define false 0
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127 # define true 1
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128 #endif
eefa36f75e14 stdbool: be more compatible with mixed C/C++ compiles
Paul Eggert <eggert@cs.ucla.edu>
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129
9260
14891e011037 Rename stdbool_.h to stdbool.in.h.
Bruno Haible <bruno@clisp.org>
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130 #define __bool_true_false_are_defined 1
14891e011037 Rename stdbool_.h to stdbool.in.h.
Bruno Haible <bruno@clisp.org>
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131
14891e011037 Rename stdbool_.h to stdbool.in.h.
Bruno Haible <bruno@clisp.org>
parents:
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132 #endif /* _GL_STDBOOL_H */