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stddef.h
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1 /*===---- stddef.h - Basic type definitions --------------------------------===
2  *
3  * Copyright (c) 2008 Eli Friedman
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a copy
6  * of this software and associated documentation files (the "Software"), to deal
7  * in the Software without restriction, including without limitation the rights
8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9  * copies of the Software, and to permit persons to whom the Software is
10  * furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be included in
13  * all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21  * THE SOFTWARE.
22  *
23  *===-----------------------------------------------------------------------===
24  */
25 
26 #if !defined(__STDDEF_H) || defined(__need_ptrdiff_t) || \
27  defined(__need_size_t) || defined(__need_wchar_t) || \
28  defined(__need_NULL) || defined(__need_wint_t)
29 
30 #if !defined(__need_ptrdiff_t) && !defined(__need_size_t) && \
31  !defined(__need_wchar_t) && !defined(__need_NULL) && \
32  !defined(__need_wint_t)
33 /* Always define miscellaneous pieces when modules are available. */
34 #if !__has_feature(modules)
35 #define __STDDEF_H
36 #endif
37 #define __need_ptrdiff_t
38 #define __need_size_t
39 #define __need_wchar_t
40 #define __need_NULL
41 #define __need_STDDEF_H_misc
42 /* __need_wint_t is intentionally not defined here. */
43 #endif
44 
45 #if defined(__need_ptrdiff_t)
46 #if !defined(_PTRDIFF_T) || __has_feature(modules)
47 /* Always define ptrdiff_t when modules are available. */
48 #if !__has_feature(modules)
49 #define _PTRDIFF_T
50 #endif
51 typedef __PTRDIFF_TYPE__ ptrdiff_t;
52 #endif
53 #undef __need_ptrdiff_t
54 #endif /* defined(__need_ptrdiff_t) */
55 
56 #if defined(__need_size_t)
57 #if !defined(_SIZE_T) || __has_feature(modules)
58 /* Always define size_t when modules are available. */
59 #if !__has_feature(modules)
60 #define _SIZE_T
61 #endif
62 typedef __SIZE_TYPE__ size_t;
63 #endif
64 #undef __need_size_t
65 #endif /*defined(__need_size_t) */
66 
67 #if defined(__need_STDDEF_H_misc)
68 /* ISO9899:2011 7.20 (C11 Annex K): Define rsize_t if __STDC_WANT_LIB_EXT1__ is
69  * enabled. */
70 #if (defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ >= 1 && \
71  !defined(_RSIZE_T)) || __has_feature(modules)
72 /* Always define rsize_t when modules are available. */
73 #if !__has_feature(modules)
74 #define _RSIZE_T
75 #endif
76 typedef __SIZE_TYPE__ rsize_t;
77 #endif
78 #endif /* defined(__need_STDDEF_H_misc) */
79 
80 #if defined(__need_wchar_t)
81 #ifndef __cplusplus
82 /* Always define wchar_t when modules are available. */
83 #if !defined(_WCHAR_T) || __has_feature(modules)
84 #if !__has_feature(modules)
85 #define _WCHAR_T
86 #if defined(_MSC_EXTENSIONS)
87 #define _WCHAR_T_DEFINED
88 #endif
89 #endif
90 typedef __WCHAR_TYPE__ wchar_t;
91 #endif
92 #endif
93 #undef __need_wchar_t
94 #endif /* defined(__need_wchar_t) */
95 
96 #if defined(__need_NULL)
97 #undef NULL
98 #ifdef __cplusplus
99 # if !defined(__MINGW32__) && !defined(_MSC_VER)
100 # define NULL __null
101 # else
102 # define NULL 0
103 # endif
104 #else
105 # define NULL ((void*)0)
106 #endif
107 #ifdef __cplusplus
108 #if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
109 namespace std { typedef decltype(nullptr) nullptr_t; }
110 using ::std::nullptr_t;
111 #endif
112 #endif
113 #undef __need_NULL
114 #endif /* defined(__need_NULL) */
115 
116 #if defined(__need_STDDEF_H_misc)
117 #if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L
118 #include "__stddef_max_align_t.h"
119 #endif
120 #define offsetof(t, d) __builtin_offsetof(t, d)
121 #undef __need_STDDEF_H_misc
122 #endif /* defined(__need_STDDEF_H_misc) */
123 
124 /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use
125 __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */
126 #if defined(__need_wint_t)
127 /* Always define wint_t when modules are available. */
128 #if !defined(_WINT_T) || __has_feature(modules)
129 #if !__has_feature(modules)
130 #define _WINT_T
131 #endif
132 typedef __WINT_TYPE__ wint_t;
133 #endif
134 #undef __need_wint_t
135 #endif /* __need_wint_t */
136 
137 #endif
Definition: Format.h:1821
__WCHAR_TYPE__ wchar_t
Definition: stddef.h:90
__SIZE_TYPE__ size_t
Definition: stddef.h:62
__PTRDIFF_TYPE__ ptrdiff_t
Definition: stddef.h:51