Variadic宏是否是非标准的？ [英] Are Variadic macros nonstandard?

问题描述

对于debugbuilds，我通常使用Clang，因为它更好地格式化警告和错误，并使它更容易跟踪和修复它们。

For debugbuilds, I usually use Clang, as it formats warnings and errors better, and makes it a little easier to track them down, and fix them.

但是最近在添加一个带有可变参数的宏之后，Clang告诉我以下（从一个虚拟项目）：

But recently after adding a Macro with variadic arguments, Clang told me the following (from a dummy project):

main.cpp:5:20: warning: named variadic macros are a GNU extension [-Wvariadic-macros]
#define stuff3(args...)  stuff_i(args)

我知道 macroname（args ...）在大量编译器中编译良好，包括Visualstudio，Sunstudio ，当然还有GCC。但为了确保cl是正确的，我尝试了两种扩展可变参数的方法：

I know that macroname(args...) compiles fine in a wide range of compilers, including Visualstudio, Sunstudio, and of course GCC. But just to make sure that clang is right, I tried two other ways of expanding the variadic arguments:

第1号：

#define stuff1(...)  stuff_i(...)

b $ b

第2个：

Number 2:

#define stuff2(...)  stuff_i(__VA_ARGS__)

我收到此信息：

main.cpp:3:16: warning: variadic macros were introduced in C99 [-Wvariadic-macros]

...这让我想知道Variadic宏是否是C ++标准的一部分（当然我知道Preprocessor是独立解释的）。

... Which makes me wonder if Variadic macros are actually part of the standard of C++ (and of course I know that the Preprocessor is interpreted independently)?

推荐答案

引用维基百科：

变量参数宏在1999年在C语言标准的ISO / IEC 9899：1999（C99）修订版中引入，2011年在ISO / IEC 14882：2011 ++ 11）C ++语言标准的修订版。

Variable-argument macros were introduced in 1999 in the ISO/IEC 9899:1999 (C99) revision of the C language standard, and in 2011 in ISO/IEC 14882:2011 (C++11) revision of the C++ language standard.

所以从C99和C ++ 11开始是标准的，在C ++ 03中。

So it's standard from C99 and C++11 onwards, but a GNU extension in C++03.

这篇关于Variadic宏是否是非标准的？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！