是否可以绑定（）*这类的成员函数，使回调到C API [英] Is it possible to bind() *this to class member function to make a callback to C API

问题描述

有没有使用升压或性病的bind（），所以我可以使用结果作为C API回调的方法吗？
这里的样本code我使用：

Is there a way to use boost or std bind() so I could use a result as a callback in C API? Here's sample code I use:

#include <boost/function.hpp>
#include <boost/bind/bind.hpp>

typedef void (*CallbackType)();

void CStyleFunction(CallbackType functionPointer)
{
    functionPointer();
}

class Class_w_callback
{
public:
    Class_w_callback()
    {
        //This would not work
    CStyleFunction(boost::bind(&Class_w_callback::Callback, this));
    }
    void Callback(){std::cout<<"I got here!\n";};
};

谢谢！

推荐答案

没有，有没有办法做到这一点。问题是，一个C函数指针基本上是没有什么比一个指令地址更多：去这个地址，并执行你发现的说明。的要带入函数的任何的状态都有要么是全球性的，或作为参数传递。

No, there is no way to do that. The problem is that a C function pointer is fundamentally nothing more than an instruction address: "go to this address, and execute the instructions you find". Any state you want to bring into the function has to either be global, or passed as parameters.

这就是为什么大多数C回调的API有背景的参数，通常是一个空指针，你可以传递，只是用来让你在你需要的数据传递。

That is why most C callback APIs have a "context" parameter, typically a void pointer, that you can pass in, and just serves to allow you to pass in the data you need.

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