RhodeCode

  public:

    ///\name Initialization

    ///

    /// @{

    /// \brief Default constructor

    ///

    /// Constructor with constant seeding.

    Random() { core.initState(); }

    /// \brief Constructor with seed

    ///

    /// Constructor with seed. The current number type will be converted

    void seed(Iterator begin, Iterator end) { 

      typedef typename std::iterator_traits<Iterator>::value_type Number;

      _random_bits::Initializer<Number, Word>::init(core, begin, end);

    }

    /// \brief Seeding from file or from process id and time

    ///

    /// By default, this function calls the \c seedFromFile() member

    /// it uses the \c seedFromTime().

    /// \return Currently always true.

    bool seed() {

#ifndef WIN32

      if (seedFromFile("/dev/urandom", 0)) return true;

#endif

      if (seedFromTime()) return true;

      return false;

    /// could give good seed values for pseudo random generators (The

    /// difference between two devices is that the <tt>random</tt> may

    /// block the reading operation while the kernel can give good

    /// source of randomness, while the <tt>urandom</tt> does not

    /// block the input, but it could give back bytes with worse

    /// entropy).

    /// \param file The source file

    /// \param offset The offset, from the file read.

#ifndef WIN32

    bool seedFromFile(const std::string& file = "/dev/urandom", int offset = 0) 

#else

    bool seedFromFile(const std::string& file = "", int offset = 0) 

#endif

    {

      std::ifstream rs(file.c_str());

      const int size = 4;

    /// \brief Returns a random real number from the range [a, b)

    ///

    /// It returns a random real number from the range [a, b).

    template <typename Number>

    Number real(Number a, Number b) { 

      return real<Number>() * (b - a) + a; 

    }

    /// \brief Returns a random real number from the range [0, 1)

    ///

    /// It returns a random double from the range [0, 1).

    double operator()() {

      return real<double>();

    }

    /// \brief Returns a random real number from the range [0, b)

    /// It returns a random non-negative integer uniformly from the

    /// whole range of the current \c Number type. The default result

    /// type of this function is <tt>unsigned int</tt>.

    template <typename Number>

    Number uinteger() {

      return _random_bits::IntConversion<Number, Word>::convert(core);

    }

    unsigned int uinteger() {

      return uinteger<unsigned int>();

    }

    /// \brief Returns a random integer

    ///

    /// It returns a random integer uniformly from the whole range of

    /// the current \c Number type. The default result type of this