text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    vtkRandomSequence.h
  
    Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
    All rights reserved.
    See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
  
       This software is distributed WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the above copyright notice for more information.
  =========================================================================*/
  /**
   * @class   vtkRandomSequence
   * @brief   Generate a sequence of random numbers.
   *
   * vtkRandomSequence defines the interface of any sequence of random numbers.
   *
   * At this level of abstraction, there is no assumption about the distribution
   * of the numbers or about the quality of the sequence of numbers to be
   * statistically independent. There is no assumption about the range of values.
   *
   * To the question about why a random "sequence" class instead of a random
   * "generator" class or to a random "number" class?, see the OOSC book:
   * "Object-Oriented Software Construction", 2nd Edition, by Bertrand Meyer.
   * chapter 23, "Principles of class design", "Pseudo-random number
   * generators: a design exercise", page 754--755.
   */
  
  #ifndef vtkRandomSequence_h
  #define vtkRandomSequence_h
  
  #include "vtkCommonCoreModule.h" // For export macro
  #include "vtkObject.h"
  
  class VTKCOMMONCORE_EXPORT vtkRandomSequence : public vtkObject
  {
  public:
    ///@{
    /**
     * Standard methods for type information and printing.
     */
    vtkTypeMacro(vtkRandomSequence, vtkObject);
    void PrintSelf(ostream& os, vtkIndent indent) override;
    ///@}
  
    /**
     * Initialize the sequence with a seed.
     */
    virtual void Initialize(vtkTypeUInt32 seed) = 0;
  
    /**
     * Return the current value.
     */
    virtual double GetValue() = 0;
  
    /**
     * Move to the next number in the random sequence.
     */
    virtual void Next() = 0;
  
  protected:
    vtkRandomSequence();
    ~vtkRandomSequence() override;
  
  private:
    vtkRandomSequence(const vtkRandomSequence&) = delete;
    void operator=(const vtkRandomSequence&) = delete;
  };
  
  #endif // #ifndef vtkRandomSequence_h
  