C/C++混合编程 —— extern "C" 的用法

最新推荐文章于 2025-09-01 07:19:43 发布

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最新推荐文章于 2025-09-01 07:19:43 发布 · 3.2k 阅读

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#c #编程 #compiler #function #server

本文介绍了在C++中如何使用extern "C"来调用C的函数，以解决编译错误。通过示例代码，展示了不使用extern "C"声明时可能出现的问题，并提供了相关C++标准的引用和外部资源链接，帮助理解这一关键概念。

2012-01-03 wcdj

Question:

What's the theory behind this: #ifdef __cplusplus extern "C" {
I have been meeting the following in some c/c++ codes but I don't understand the theory behind it:

#ifdef __cplusplus
extern "C" {
#endif

I want to understand how it works. I know about the preprocessing but I don't know what that extern "C" in the code does. Someone teach me please!

Answers 1:

The C++ compiler does something called name mangling which facilitates function overloading.
The extern "C" syntax tell the C++ compiler not to perform function overloading.
The code snippet that you posted first checks if the code being compiled is using a C++ compiler and if so starts a block in which name mangling will not be done.