stddef.h revision 04f5db699e5c1198f30cba17fd12f38805ab04df 
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#ifndef __STDDEF_H
27#define __STDDEF_H
28
29#if !defined(_PTRDIFF_T) || __has_feature(modules)
30/* Always define ptrdiff_t when modules are available. */
31#if !__has_feature(modules)
32#define _PTRDIFF_T
33#endif
34typedef __PTRDIFF_TYPE__ ptrdiff_t;
35#endif
36
37#if !defined(_SIZE_T) || __has_feature(modules)
38/* Always define size_t when modules are available. */
39#if !__has_feature(modules)
40#define _SIZE_T
41#endif
42typedef __SIZE_TYPE__ size_t;
43#endif
44
45#ifndef __cplusplus
46/* Always define wchar_t when modules are available. */
47#if !defined(_WCHAR_T) || __has_feature(modules)
48#if !__has_feature(modules)
49#define _WCHAR_T
50#endif
51typedef __WCHAR_TYPE__ wchar_t;
52#endif
53#endif
54
55#undef NULL
56#ifdef __cplusplus
57#  if !defined(__MINGW32__) && !defined(_MSC_VER)
58#    define NULL __null
59#  else
60#    define NULL 0
61#  endif
62#else
63#  define NULL ((void*)0)
64#endif
65
66#ifdef __cplusplus
67#if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
68namespace std { typedef decltype(nullptr) nullptr_t; }
69using ::std::nullptr_t;
70#endif
71#endif
72
73#define offsetof(t, d) __builtin_offsetof(t, d)
74
75#endif /* __STDDEF_H */
76
77/* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use
78__WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */
79#if defined(__need_wint_t)
80/* Always define wint_t when modules are available. */
81#if !defined(_WINT_T) || __has_feature(modules)
82#if !__has_feature(modules)
83#define _WINT_T
84#endif
85typedef __WINT_TYPE__ wint_t;
86#endif
87#undef __need_wint_t
88#endif /* __need_wint_t */
89