binding C callback function in API

[soundarsurya]

Hi,

I'm writing python wrapper for my c API using pybind11. One of my API is taking callback function as input arguments, i have no idea how we can write binding for the API with callback function. Below is my case which i'm trying,
header.h

// function definition
typedef void (*output_cb) (const out_buffer *);
typedef void (*input_cb) (const inp_buffer *);

// API taking callback function
int op_init(const config_struct *);
int op_open(void);
int op_start(enum_mode, output_cb, input_cb); 

Below is pybind11 wrapper i am trying

pybind11_wrapper.cpp

#include <pybind11/pybind11.h>

namespace py = pybind11;

PYBIND11_MODULE(pywrapper, m){
    m.def("op_init", &op_init); #take struct pointer as input
    m.def("op_open", &op_open); 
    m.def("op_start", &op_start); #taking callback fucntion as input
}