#include <stdio.h> #include <stdlib.h> /**************************************** * 函数指针结构体 ***************************************/ typedef struct _OP { float (*p_add)(float, float); float (*p_sub)(float, float); float (*p_mul)(float, float); float (*p_div)(float, float); } OP; /**************************************** * 加减乘除函数 ***************************************/ float ADD(float a, float b) { return a + b; } float SUB(float a, float b) { return a - b; } float MUL(float a, float b) { return a * b; } float DIV(float a, float b) { return a / b; } /**************************************** * 初始化函数指针 ***************************************/ void init_op(OP *op) { op->p_add = ADD; op->p_sub = SUB; op->p_mul = &MUL; op->p_div = &DIV; } /**************************************** * 库函数 ***************************************/ float add_sub_mul_div(float a, float b, float (*op_func)(float, float)) { return (*op_func)(a, b); } int main(int argc, char *argv[]) { OP *op = (OP *)malloc(sizeof(OP)); init_op(op); /* 直接使用函数指针调用函数 */ printf("ADD = %f, SUB = %f, MUL = %f, DIV = %f\n", (op->p_add)(1.3, 2.2), (*op->p_sub)(1.3, 2.2), (op->p_mul)(1.3, 2.2), (*op->p_div)(1.3, 2.2)); /* 调用回调函数 */ printf("ADD = %f, SUB = %f, MUL = %f, DIV = %f\n", add_sub_mul_div(1.3, 2.2, ADD), add_sub_mul_div(1.3, 2.2, SUB), add_sub_mul_div(1.3, 2.2, MUL), add_sub_mul_div(1.3, 2.2, DIV)); return 0; }
参考:
https://segmentfault.com/a/1190000008293902