stddef.h revision 07ffbd74e2188a3a353e9957b9fa0e2f7424e1b4
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#if defined(__APPLE__) && defined(__DARWIN_NULL) 57# define NULL __DARWIN_NULL 58#elif defined(__cplusplus) 59# if !defined(__MINGW32__) && !defined(_MSC_VER) 60# define NULL __null 61# else 62# define NULL 0 63# endif 64#else 65# define NULL ((void*)0) 66#endif 67 68#ifdef __cplusplus 69#if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED) 70namespace std { typedef decltype(nullptr) nullptr_t; } 71using ::std::nullptr_t; 72#endif 73#endif 74 75#define offsetof(t, d) __builtin_offsetof(t, d) 76 77#endif /* __STDDEF_H */ 78 79/* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use 80__WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */ 81#if defined(__need_wint_t) 82/* Always define wint_t when modules are available. */ 83#if !defined(_WINT_T) || __has_feature(modules) 84#if !__has_feature(modules) 85#define _WINT_T 86#endif 87typedef __WINT_TYPE__ wint_t; 88#endif 89#undef __need_wint_t 90#endif /* __need_wint_t */ 91