C函數，函數指標，函數類型，函數數組，函數強制轉換使用

/*  * File:   main.cpp * Author: Vicky * */#include <iostream>#include <cstdarg>/** 建立函數類型，可以用於建立函數數組 */typedef void (*FUNC_t)(int id, int args_size, ...);void pcreate(int id, int args_size, ...) {    std::cout << "create" << std::endl;}void pread(int id, int args_size, ...) {    std::cout << "read" << std::endl;}void pupdate(int id, int args_size, ...) {    std::cout << "update" << std::endl;}void pdelete(int id, int args_size, ...) {    std::cout << "delete" << std::endl;}/** 可以限制某類相同函數的操作類型,用於函數流程式控制制 */FUNC_t funcs[] = {    &pcreate,    &pread,    &pupdate,    &pdelete,};void args(int args_size/** 可變參數長度 */, ... /** 可變參數*/) {    va_list argp;    va_start(argp, args_size);    for (int i = 0; i < args_size; i++) {        char* arg = va_arg(argp, char*);        std::cout << arg;    }    std::cout << std::endl;    va_end(argp);}/* *  */int main(void) {    args(2, "Hello ", "World!");    void (*function_args)(int, ...) = &args;    function_args(3, "Fuck ", "FFFKKK ", "尼瑪");    std::cout << "---------------------------" << std::endl;    int funcs_size = sizeof (funcs) / 4;    for (int i = 0; i < funcs_size; i++) {        funcs[i](10001, 0); // 調用函數    }    std::cout << "---------------------------" << std::endl;    printf("funcs[0] = %d\tpcreate = %d\n", funcs[0], pcreate);        std::cout << "通過函數指標地址值（int）轉換為函數並調用" << std::endl;        int p_adr = int(funcs[0]);    std::cout << "p_adr = " << p_adr << std::endl;    FUNC_t f = FUNC_t(p_adr);    f(2001,0);    return 0;}

Hello World!
Fuck FFFKKK 尼瑪
---------------------------
create
read
update
delete
---------------------------
funcs[0] = 134514602    pcreate = 134514602
通過函數指標地址值（int）轉換為函數並調用
p_adr = 134514602
create