generate random string in c 2b 2b

1#include <random>
2#include <string>
3
4std::string random_string()
5{
6     std::string str("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
7
8     std::random_device rd;
9     std::mt19937 generator(rd());
10
11     std::shuffle(str.begin(), str.end(), generator);
12
13     return str.substr(0, 32);    // assumes 32 < number of characters in str         
14}
15