stddef.h定义了一些标准宏以及类型.
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/* _stddef.h multi-includable Definitions for common types, and NULL */ /* * C/C++ Run Time Library - Version 11.0 * * Copyright (c) 1987, 2002 by Borland Software Corporation * All Rights Reserved. * */ /* $Revision: 9.6.2.2 $ */ #ifndef ___STDDEF_H #define ___STDDEF_H #if !defined(___DEFS_H) #include <_defs.h> #endif #ifndef NULL #include <_null.h> #endif /* Full locale support is on by default now. To get the previous behavior, define __SIMPLE_LOCALES__ */ #ifndef __SIMPLE_LOCALES__ #define __USELOCALES__ #endif #ifdef __cplusplus namespace std { #endif /* __cplusplus */ /* Define __STD to expand to std:: or nothing depending on being in C++. */ #ifdef __cplusplus # define __STD std:: #else # define __STD #endif /* Define the size_t type in the std namespace if in C++ or globally if in C. If we're in C++, make the _SIZE_T macro expand to std::size_t */ #if !defined(_SIZE_T) && !defined(_SIZE_T_DEFINED) # define _SIZE_T_DEFINED typedef unsigned int size_t; # if defined(__cplusplus) # define _SIZE_T std::size_t # else # define _SIZE_T size_t # endif #endif #if !defined(RC_INVOKED) #if defined(__STDC__) #pragma warn -nak #endif #endif /* !RC_INVOKED */ #ifndef _PTRDIFF_T #define _PTRDIFF_T typedef int ptrdiff_t; #endif #define offsetof( s_name, m_name ) (_SIZE_T)&(((s_name _FAR *)0)->m_name) #ifndef __cplusplus #if !defined(_WCHAR_T) && !defined(_WCHAR_T_DEFINED) #define _WCHAR_T #define _WCHAR_T_DEFINED /* For WINDOWS.H */ typedef unsigned short wchar_t; #endif #endif /* Define the wint_t type in the std namespace if in C++ or globally if in C. If we're in C++, make the _WINT_T macro expand to std::wint_t */ #if !defined(_WINT_T) typedef wchar_t wint_t; # ifdef __cplusplus # define _WINT_T std::wint_t # else # define _WINT_T wint_t # endif #endif #ifndef _WCTYPE_T_DEFINED typedef wchar_t wctype_t; #define _WCTYPE_T_DEFINED #endif #ifdef __cplusplus extern "C" { #endif extern unsigned long _RTLENTRY _EXPFUNC __threadid(void); #define _threadid (__threadid()) #ifdef __cplusplus } #endif #if !defined(RC_INVOKED) #if defined(__STDC__) #pragma warn .nak #endif #endif /* !RC_INVOKED */ #ifdef __cplusplus } // std #endif /* __cplusplus */ #endif /* __STDDEF_H */ #if defined(__cplusplus) && !defined(__USING_CNAME__) && !defined(___STDDEF_H_USING_LIST) #define ___STDDEF_H_USING_LIST using std::ptrdiff_t; using std::__threadid; using std::size_t; using std::wint_t; using std::wctype_t; #endif /* __USING_CNAME__ */ |