#include <iostream>#include <string>using namespace std;
//传入的参数是数组的引用，返回值也是数组的引用string (&fun(string (&s)[10]))[10]{    return s;}//using str_arr = string (&)[10];
/*
typedef string str_arr[10];
str_arr &fun1(str_arr &s){
　　return s;
}
*/
typedef string (&str_arr)[10];str_arr fun1(str_arr s) {    return s;}auto fun2(string (&s)[10])  -> string (&)[10]{    return s;}string d[10];decltype(d) &fun3(decltype(d) &s){    return s;}int main(int argc, char *argv[]){    string s[10] = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "1"};    decltype(s) &ds = fun(s);    //decltype(s) &ds = fun1(s);    //decltype(s) &ds = fun2(s);    //decltype(s) &ds = fun3(s);    ds[1] = "han";    for (const auto &a : s)    {        cout << a << endl;    }    cout << endl;    return 0;}