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/*
 * Copyright (C) 2009 - present by OpenGamma Inc. and the OpenGamma group of companies
 *
 * Please see distribution for license.
 */
/*
 * This code is copied from the original library from the `cern.jet.random.engine` package.
 * Changes:
 * - package name
 * - added serialization version
 * - reformat
 */
/*
Copyright � 1999 CERN - European Organization for Nuclear Research.
Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose
is hereby granted without fee, provided that the above copyright notice appear in all copies and
that both that copyright notice and this permission notice appear in supporting documentation.
CERN makes no representations about the suitability of this software for any purpose.
It is provided "as is" without expressed or implied warranty.
*/
package com.opengamma.strata.math.impl.cern;

import java.util.Date;

//CSOFF: ALL
/**
 * Same as MersenneTwister except that method raw() returns 64 bit random numbers instead of 32 bit random numbers.
 * 
 * @author [email protected]
 * @version 1.0, 09/24/99
 * @see MersenneTwister
 */
public class MersenneTwister64 extends MersenneTwister {
  private static final long serialVersionUID = 1L;

  /**
  * Constructs and returns a random number generator with a default seed, which is a constant.
  */
  public MersenneTwister64() {
    super();
  }

  /**
   * Constructs and returns a random number generator with the given seed.
   * @param seed should not be 0, in such a case MersenneTwister64.DEFAULT_SEED is silently substituted.
   */
  public MersenneTwister64(int seed) {
    super(seed);
  }

  /**
   * Constructs and returns a random number generator seeded with the given date.
   *
   * @param d typically new java.util.Date()
   */
  public MersenneTwister64(Date d) {
    super(d);
  }

  /**
   * Returns a 64 bit uniformly distributed random number in the open unit interval (0.0,1.0) (excluding 0.0 and 1.0).
   */
  @Override
  public double raw() {
    return nextDouble();
  }
}