cython

cython

/* callback.h START*/
#ifndef _CALLBACK_H_
#define _CALLBACK_H_

typedef int (*op)(int,int);

int binary_op(int a, int b, op func);

#endif
/* callback.h END*/
/* callback.c START */
#include "callback.h"

int binary_op(int a, int b, op func) {
	return (func)(a,b);
}
/* callback.c END */
/* cython2.pyx START */
cdef extern from "callback.h":
    ctypedef int (*op)(int,int)
    int binary_op(int a, int b, op func)

cdef int callback(int a, int b):
    return bop_callback(a,b) 

cdef bop_callback
def bop(a,b,func):
 global bop_callback
 bop_callback = func
 
 print(bop_callback(a,b))
 print('aaaa')
 return binary_op(a,b,callback)
/* cython2.pyx END */