How to use a std::function as a C style callback
In most cases you can't.
But when you store a C style callback in your std::function
, you can use the target()
member function.
Long answer: sort of. You can write a C function to pass to the API that calls your std::function
:
// --- some C code I can not change ---
typedef void(*fun)(int);
void register_callback(fun f) {
f(42); // a test
}
// ------------------------------------
#include <functional>
#include <iostream>
void foo(const char* ptr, int v, float x) {
std::cout << ptr << " " << v << " " << x << std::endl;
}
namespace {
std::function<void(int)> callback;
extern "C" void wrapper(int i) {
callback(i);
}
}
int main() {
callback = std::bind(&foo, "test", std::placeholders::_1, 3.f);
register_callback(wrapper); // <-- How to do this?
}