how to convert to "C" format by using std::bind member function of a class as a thread portal function?

Question

if there is function for thread creating

int thread_create( void*(*create_cb)(void*), void* arg);

there is a class example which have a member function:

void* example::startupTask(void *args);

how to convert to "C" format by using std::bind member function of a class as a thread portal function?

std::function<void* (void*)> func = std::bind(&example::startupTask, this, std::placeholders::_1);
auto rtn = thread_create((*func.target<std::_Bind <void*(example::*(example*, std::_Placeholder<1>))(void*)> >()), nullptr);

this code can run crashed.

Answer 1

Impossible. std::bind returns a CPP object with operator() , so it acts like a function. thread_create expects a pointer to a memory address.

Instead, you should use the additional parameter in thread_create to pass the context for the function.