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函数指针-kernel例子


示例

ep_call_nested(struct nested_calls *ncalls, int max_nests,
int (*nproc)(int *, int *, int))

代码示例

#include "stdio.h"
#include <stdlib.h>

struct nested_calls {
int a;
int b;
};


int sum(int * a, int * b, int c) {
printf("*a=%d \n",*a);
printf("*b=%d \n",*b);
return *a + *b + c;
}

int ep_call_nested(struct nested_calls *ncalls, int max_nests,
int (*nproc)(int *, int *, int)) {

int aa = 10;
int bb = 20;
int * a = &aa;
int * b = &bb;

// 10+20+30 = 60
int sum = (*nproc)(a, b, 30);
// printf("sum=%d \n",sum);

return ncalls->a+ncalls->b+sum+max_nests;

}

int main() {

struct nested_calls *ncalls = (struct nested_calls*)malloc(sizeof(struct nested_calls));
ncalls-> a = 20;
ncalls-> b = 30;
int max_nests = 40;

// 20+30+40+60
int result = ep_call_nested(ncalls,max_nests,sum);

// 150
printf("result=%d \n",result);
return 0;
}


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