从不同的 cpp 调用回调函数会导致 bad_function_call

Question

I'm currently working on an OpenCV project where I want to call a callback function in main.cpp from a different cpp.
The problem I'm facing is that when I want to call the function I get a bad_function_call because the Callback function is a null.

My main.cpp looks like this:

 PointDetection *detect;
 detect->houghCallback = [hPublisher] (std::vector<cv::Vec4i> data) {
        //do something
 };

my PointDetector.hpp, which gets included by the PointDetector.cpp:

 std::function <void (std::vector<cv::Vec4i> data) houghCallback;

My PointDetector.cpp, where I call the function looks like this:

 void PointDetector::houghDetectCb(int status, void *userData) {
        std::vector<cv::Vec4i> houghPointsResult;
        PointDetector *self = static_cast<PointDetector *>(userData);    //This includes every variable in the hpp except the houghCallback for some reason 
        self->houghCallback(houghPointsResult);                          //This causes the bad_function_call because houghCallback is Null 
 }

Does somebody know if it is possible to call the Callback like this?

Answer 1

我找到了解决方案：我在实际的 GPU 操作之前调用了 stream.enqueqeHostCallback（参见这个问题： cuda 流：流执行后未调用回调）