stddef.h revision 239462
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#ifndef _PTRDIFF_T 30#define _PTRDIFF_T 31typedef __typeof__(((int*)0)-((int*)0)) ptrdiff_t; 32#endif 33#ifndef _SIZE_T 34#define _SIZE_T 35typedef __typeof__(sizeof(int)) size_t; 36#endif 37#ifndef __cplusplus 38#ifndef _WCHAR_T 39#define _WCHAR_T 40typedef __WCHAR_TYPE__ wchar_t; 41#endif 42#endif 43 44#undef NULL 45#ifdef __cplusplus 46# if !defined(__MINGW32__) && !defined(_MSC_VER) 47# define NULL __null 48# else 49# define NULL 0 50# endif 51#else 52# define NULL ((void*)0) 53#endif 54 55#ifdef __cplusplus 56#if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED) 57namespace std { typedef decltype(nullptr) nullptr_t; } 58using ::std::nullptr_t; 59#endif 60#endif 61 62#define offsetof(t, d) __builtin_offsetof(t, d) 63 64#endif /* __STDDEF_H */ 65 66/* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use 67__WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */ 68#if defined(__need_wint_t) 69#if !defined(_WINT_T) 70#define _WINT_T 71typedef __WINT_TYPE__ wint_t; 72#endif /* _WINT_T */ 73#undef __need_wint_t 74#endif /* __need_wint_t */ 75