具有外部"C"的C和C ++链接 [英] C and C++ linkage with extern "C"

问题描述

我在.h文件中定义了如下的C ++函数，并在.cpp文件中实现:

I have a C++ function defined in a .h file as follows and implemented in a .cpp file:

extern "C" void func(bool first, float min, float* state[6], float* err[6][6])
{
    //uses vectors and classes and other C++ constructs
}

如何在C文件中调用func?如何设置我的文件体系结构/makefile来对此进行编译?

How can I call func in a C file? How do I set up my file architecture / makefile to compile this?

谢谢！

推荐答案

要在C中调用它，您所需要做的就是正常调用它.因为您告诉编译器在extern "C"中使用C调用约定和ABI，所以可以正常调用它:

To call it in C, all you need to do is call it normally. Because you told the compiler to use the C calling conventions and ABI with extern "C", you can call it normally:

func(args);

要编译，请将其用于C ++:

To compiler, use this for the C++:

g++ -c -o myfunc.o myfunc.cpp

然后针对C:

gcc -c -o main.o somec.c

比链接:

g++ -o main main.o myfunc.o

确保该函数的C ++标头使用仅C构造.因此，请将<vector>之类的内容包含在.cpp文件中.

Make sure that the C++ header for the function uses ONLY C CONSTRUCTS. So include things like <vector> in the .cpp file instead.

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