ceph/src/boost/libs/random/example/password.cpp

   1 // password.cpp
   2 //
   3 // Copyright (c) 2010
   4 // Steven Watanabe
   5 //
   6 // Distributed under the Boost Software License, Version 1.0. (See
   7 // accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9
  10 //[password
  11 /*`
  12     For the source of this example see
  13     [@boost://libs/random/example/password.cpp password.cpp].
  14
  15     This example demonstrates generating a random 8 character
  16     password.
  17  */
  18
  19
  20 #include <boost/random/random_device.hpp>
  21 #include <boost/random/uniform_int_distribution.hpp>
  22 #include <iostream>
  23
  24 int main() {
  25     /*<< We first define the characters that we're going
  26          to allow.  This is pretty much just the characters
  27          on a standard keyboard.
  28     >>*/
  29     std::string chars(
  30         "abcdefghijklmnopqrstuvwxyz"
  31         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  32         "1234567890"
  33         "!@#$%^&*()"
  34         "`~-_=+[{]}\\|;:'\",<.>/? ");
  35     /*<< We use __random_device as a source of entropy, since we want
  36          passwords that are not predictable.
  37     >>*/
  38     boost::random::random_device rng;
  39     /*<< Finally we select 8 random characters from the
  40          string and print them to cout.
  41     >>*/
  42     boost::random::uniform_int_distribution<> index_dist(0, chars.size() - 1);
  43     for(int i = 0; i < 8; ++i) {
  44         std::cout << chars[index_dist(rng)];
  45     }
  46     std::cout << std::endl;
  47 }
  48
  49 //]