cython - callback函数调用

find_cheeses.h 与 find_cheeses.c都是标准的c接口；

1. find_cheeses.h文件

// find_cheeses.h 文件

typedef void (*cheesefunc)(char *name, void *user_data);
void find_cheeses(cheesefunc user_func, void *user_data);

*.h上的函数，需在pyx中重新cython化；

2. find_cheeses.c文件

/*
 *   An example of a C API that provides a callback mechanism.
 */

#include "cheesefinder.h"

static char *cheeses[] = {
  "cheddar",
  "camembert",
  "that runny one",
  0
};

void find_cheeses(cheesefunc user_func, void *user_data) {
  char **p = cheeses;
  while (*p) {
    user_func(*p, user_data);
    ++p;
  }
}

3. cheese.pyx文件

#
#   Cython wrapper for the cheesefinder API
#

cdef extern from "cheesefinder.h":
    ctypedef void (*cheesefunc)(char *name, void *user_data)
    void find_cheeses(cheesefunc user_func, void *user_data)

def find(f):
    find_cheeses(callback, f)

cdef void callback(char *name, void *f):
    (