返回数组指针的4种函数写法

#include <iostream>
#include <string>

using namespace std;

//传入的参数是数组的指针，返回值是数组的指针
string (*fun(string (*s)[10]))[10]
{
return s;

}

//using str_arr = string (*)[10];
/*typedef string (*str_arr)[10];
str_arr fun1(str_arr 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;
}