我怎么写，可以在C ++程序中使用C头文件？ [英] How do I write a C header file that can be used in C++ programs?

问题描述

可能重复：结果
  <一href=\"http://stackoverflow.com/questions/4149229/how-to-check-via-the-$p$pprocessor-if-a-c-source-file-is-being-compiled-as-c\">How检查（通过preprocessor）如果C源文件被编译为C ++ code

我试图找到一个标准的宏将测试一个头文件是否被编译为C或C ++。这样做的目的是，头部可以由C或C ++ code包括在内，必须表现略有不同，这取决于。具体做法是：

I'm trying to find a standard macro which will test whether a header file is being compiled as C or as C++. The purpose of this is that the header may be included by either C or C++ code, and must behave slightly differently depending on which. Specifically:

在C，我需要这是在code：

In C, I need this to be the code:

extern size_t insert (const char*);

在C ++中，我需要这是在code：

In C++, I need this to be the code:

extern "C" size_t insert (const char*);

此外，有没有办法避免把的#ifdef周围的每一个声明在头？

Additionally, is there a way to avoid putting #ifdef's around every declaration in the header?

推荐答案

这是正常的支架C头文件如下这样他们就可以在C ++程序中使用。检查你的系统的头文件，如stdio.h中，你可能会看到：

It is normal to bracket C header files as follows so they can be used in C++ programs. Check your system header files such as stdio.h and you will probably see this:

#ifdef __cplusplus
extern "C" {
#endif

...

#ifdef __cplusplus
}
#endif

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