uuid.hpp

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#pragma once
 
#include <random>
#include <sstream>
 
namespace iganet {
namespace utils {
 
class uuid {
public:
  static std::string create() {
    std::stringstream hexstream;
    hexstream << uuid::random_hex(4) << "-" << uuid::random_hex(2) << "-"
              << uuid::random_hex(2) << "-" << uuid::random_hex(2) << "-"
              << uuid::random_hex(6);
    return hexstream.str();
  }
 
private:
  static std::string random_hex(const unsigned int len) {
    std::stringstream ss;
    for (auto i = 0; i < len; i++) {
      const auto rc = random_char();
      std::stringstream hexstream;
      hexstream << std::hex << rc;
      auto hex = hexstream.str();
      ss << (hex.length() < 2 ? '0' + hex : hex);
    }
    return ss.str();
  }
 
  static unsigned int random_char() {
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dis(0, 255);
    return dis(gen);
  }
};
 
} // namespace utils
} // namespace iganet