use-uuid.cpp

/*
 *  libuuid sample program
 *
 *  C version available here:
 *  https://gist.github.com/yoggy/4483031
 *
 */

#include <cstdlib>
#include <iostream>
#include <string>

#include <uuid/uuid.h>

int main() {
  // typedef unsigned char uuid_t[16];
  uuid_t uuid;

  // generate
  uuid_generate(uuid);

  // unparse (to string)
  char uuid_str[37]; // ex. "1b4e28ba-2fa1-11d2-883f-0016d3cca427" + "\0"
  uuid_unparse_lower(uuid, uuid_str);
  std::cout << "Generate UUID = " << uuid_str << std::endl;

  // parse (from string)
  uuid_t uuid2;
  uuid_parse(uuid_str, uuid2);

  // compare (retval == 0)
  int retval;
  retval = uuid_compare(uuid, uuid2);
  std::cout << "uuid_compare() result = " << retval << std::endl;

  // compare (retval == 1)
  uuid_t uuid3;
  uuid_parse("1b4e28ba-2fa1-11d2-883f-0016d3cca427", uuid3);
  retval = uuid_compare(uuid, uuid3);
  std::cout << "uuid_compare() result = " << retval << std::endl;

  // is null? (retval == 0)
  retval = uuid_is_null(uuid);
  std::cout << "uuid_null() result = " << retval << std::endl;

  // is null? (retval == 1)
  uuid_clear(uuid);
  retval = uuid_is_null(uuid);
  std::cout << "uuid_null() result = " << retval << std::endl;

  return EXIT_SUCCESS;
}