user-0 提问: 如何使用宏定义替代一个不定函数？

回复:
user: user-1
content: __VAR_ARGS__打错了， 应该是__VA_ARGS__。  c++也支持__VA_ARGS__。

user: user-2
content: GCC: #define DEBUG(fmt, ...) RecordLog(__FUNCTION__, fmt, __VAR_ARGS__)

user: user-0
content: 如果是C++有什么办法没有呢？

user: user-0
content: #define DEBUG(fmt, ...) RecordLog(__FUNCTION__, fmt, __VA_ARGS__) 这个编译过了。 = =,打错了吧

user: user-3
content: ms-help://MS.VSCC.v90/MS.MSDNQTR.v90.chs/dv_vclang/html/1cc5f70a-a225-469c-aed0-fe766238e23f.htm Predefined Macros  See Also  Send Feedback     Names the predefined ANSI C and Microsoft C++ implementation macros.  The compiler recognizes predefined ANSI C macros and the Microsoft C++ implementation provides several more. These macros take no arguments and cannot be redefined. Some of the predefined macros listed below are defined with multiple values. See the following tables for more information.  Macro  Description   __DATE__  The compilation date of the current source file. The date is a string literal of the form Mmm dd yyyy. The month name Mmm is the same as for dates generated by the library function asctime declared in TIME.H.    __FILE__  The name of the current source file. __FILE__ expands to a string surrounded by double quotation marks. To ensure that the full path to the file is displayed, use /FC (Full Path of Source Code File in Diagnostics).  You can create your own wide string version of __FILE__ as follows:    Copy Code  #include <stdio.h> #define WIDEN2(x) L ## x #define WIDEN(x) WIDEN2(x) #define __WFILE__ WIDEN(__FILE__) wchar_t *pwsz = __WFILE__;  int main() {}     __LINE__  The line number in the current source file. The line number is a decimal integer constant. It can be altered with a #line directive.    __STDC__  Indicates full conformance with the ANSI C standard. Defined as the integer constant 1 only if the /Za compiler option is given and you are not compiling C++ code; otherwise is undefined.    __TIME__  The most recent compilation time of the current source file. The time is a string literal of the form hh:mm:ss.    __TIMESTAMP__  The date and time of the last modification of the current source file, expressed as a string literal in the form Ddd Mmm Date hh:mm:ss yyyy, where Ddd is the abbreviated day of the week and Date is an integer from 1 to 31.   Macro  Description   _ATL_VER  Defines the ATL version.   _CHAR_UNSIGNED  Default char type is unsigned. Defined when /J is specified.    __CLR_VER  Defines the version of the common language runtime used when the application was compiled. The value returned will be in the following format:  Mmmbbbbb  where,  M is the major version of the runtime.  mm is the minor version of the runtime.  bbbbb is the build number.    Copy Code  // clr_ver.cpp // compile with: /clr using namespace System; int main() {    Console::WriteLine(__CLR_VER); }     __cplusplus_cli  Defined when compiling with /clr, /clr:pure, or /clr:safe. Value of __cplusplus_cli is 200406. __cplusplus_cli is in effect throughout the translation unit.     Copy Code  // cplusplus_cli.cpp // compile with: /clr #include "stdio.h" int main() {    #ifdef __cplusplus_cli       printf("%d\n", __cplusplus_cli);    #else       printf("not defined\n");    #endif }     __COUNTER__  Expands to an integer starting with 0 and incrementing by 1 every time it is used in a compiland. __COUNTER__ remembers its state when using precompiled headers. If the last __COUNTER__ value was 4 after building a precompiled header (PCH), it will start with 5 on each PCH use.  __COUNTER__ lets you generate unique variable names. You can use token pasting with a prefix to make a unique name. For example:    Copy Code  // pre_mac_counter.cpp #include <stdio.h> #define FUNC2(x,y) x##y #define FUNC1(x,y) FUNC2(x,y) #define FUNC(x) FUNC1(x,__COUNTER__)  int FUNC(my_unique_prefix); int FUNC(my_unique_prefix);  int main() {    my_unique_prefix0 = 0;    printf_s("\n%d",my_unique_prefix0);    my_unique_prefix0++;    printf_s("\n%d",my_unique_prefix0); }     __cplusplus  Defined for C++ programs only.   _CPPLIB_VER  Defined if you include any of the C++ Standard Library headers; reports which version of the Dinkumware header files are present.   _CPPRTTI  Defined for code compiled with /GR (Enable Run-Time Type Information).   _CPPUNWIND  Defined for code compiled with /GX (Enable Exception Handling).   _DEBUG  Defined when compiling with /LDd, /MDd, and /MTd.   _DLL  Defined when /MD or /MDd (Multithread DLL) is specified.   __FUNCDNAME__  Valid only within a function and returns the decorated name of the enclosing function (as a string). __FUNCDNAME__ is not expanded if you use the /EP or /P compiler option.   __FUNCSIG__  Valid only within a function and returns the signature of the enclosing function (as a string). __FUNCSIG__ is not expanded if you use the /EP or /P compiler option.  On a 64-bit operating system, the calling convention is __cdecl by default.   __FUNCTION__  Valid only within a function and returns the undecorated name of the enclosing function (as a string). __FUNCTION__ is not expanded if you use the /EP or /P compiler option.   _INTEGRAL_MAX_BITS  Reports the maximum size (in bits) for an integral type.    Copy Code  // integral_max_bits.cpp #include <stdio.h> int main() {    printf("%d\n", _INTEGRAL_MAX_BITS); }     _M_ALPHA  Defined for DEC ALPHA platforms (no longer supported).   _M_CEE  Defined for a compilation that uses any form of /clr (/clr:oldSyntax, /clr:safe, for example).   _M_CEE_PURE  Defined for a compilation that uses /clr:pure.   _M_CEE_SAFE  Defined for a compilation that uses /clr:safe.   _M_IX86  Defined for x86 processors. See Values for _M_IX86 for more details.   _M_IA64  Defined for Itanium Processor Family 64-bit processors.   _M_IX86_FP  Expands to a value indicating which /arch compiler option was used:  0 if /arch was not used.  1 if /arch:SSE was used.  2 if /arch:SSE2 was used.  See /arch (Minimum CPU Architecture) for more information.   _M_MPPC  Defined for Power Macintosh platforms (no longer supported).   _M_MRX000  Defined for MIPS platforms (no longer supported).   _M_PPC  Defined for PowerPC platforms (no longer supported).   _M_X64  Defined for x64 processors.   _MANAGED  Defined to be 1 when /clr is specified.   _MFC_VER  Defines the MFC version. For example, 0x0700 represents MFC version 7.   _MSC_EXTENSIONS  This macro is defined when compiling with the /Ze compiler option (the default). Its value, when defined, is 1.   _MSC_VER  Reports the major and minor versions of the compiler. For example, 1310 for Microsoft Visual C++ .NET 2003. 1310 represents version 13 and a 1.0 point release. The Visual C++ 2005 compiler version is 1400.  Type cl /? at the command line to see the major and minor versions of your compiler along with the build number.   __MSVC_RUNTIME_CHECKS  Defined when one of the /RTC compiler options is specified.   _MT  Defined when /MD or /MDd (Multithreaded DLL) or /MT or /MTd (Multithreaded) is specified.   _NATIVE_WCHAR_T_DEFINED  Defined when /Zc:wchar_t is used.   _OPENMP  Defined when compiling with /openmp, returns an integer representing the date of the OpenMP specification implemented by Visual C++.    Copy Code  // _OPENMP_dir.cpp // compile with: /openmp  #include <stdio.h>  int main() {    printf("%d\n", _OPENMP); }     _VC_NODEFAULTLIB  Defined when /Zl is used; see /Zl (Omit Default Library Name) for more information.   _WCHAR_T_DEFINED  Defined when /Zc:wchar_t is used or if wchar_t is defined in a system header file included in your project.   _WIN32  Defined for applications for Win32 and Win64. Always defined.    _WIN64  Defined for applications for Win64.   _Wp64  Defined when specifying /Wp64.    As shown in following table, the compiler generates a value for the preprocessor identifiers that reflect the processor option specified.  Option in Development Environment  Command-Line Option  Resulting Value   Blend  /GB  _M_IX86 = 600 (Default. Future compilers will emit a different value to reflect the dominant processor.)   Pentium  /G5  _M_IX86 = 500   Pentium Pro, Pentium II, and Pentium III  /G6  _M_IX86 = 600   80386  /G3  _M_IX86 = 300   80486  /G4  _M_IX86 = 400    See Also Concepts Macros (C/C++) Preprocessor Operators Preprocessor Directives Send feedback on this topic to Microsoft.

user: user-0
content: 引用 5 楼 hgjyts65fg 的回复:__VAR_ARGS__是预编译处理的东西，没有头文件声明。 = =,那编译出问题是因为GCC的版本？ 因为我在网上看到不是所有的GCC都支持这个吧

user: user-1
content: __VAR_ARGS__是预编译处理的东西，没有头文件声明。

user: user-0
content: 我是用的gcc 4.4.4

user: user-0
content: 引用 1 楼 JiMoKuangXiangQu 的回复:GCC: #define DEBUG(fmt, ...) RecordLog(__FUNCTION__, fmt, __VAR_ARGS__) __VAR_ARGS__是哪个头文件的？ 我gcc怎么编译没有声明？

user: user-4
content: 引用 1 楼 JiMoKuangXiangQu 的回复:GCC: #define DEBUG(fmt, ...) RecordLog(__FUNCTION__, fmt, __VAR_ARGS__)  正解