src/core/ForgetCurve.h

   1 /**
   2  * FileName: ForgetCurve.h
   3  * Used to define the class ForgetCurve which is used to describe the
   4  * Forgetting Curve.
   5  *
   6  * Copyright (C) 2008 Kermit Mei <kermit.mei@gmail.com>
   7  * All Rights Reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 3 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation.
  21  *
  22  * Written by Kermit Mei <kermit.mei@gmail.com>
  23  *
  24  * Many of the ideas implemented here are from the author's experiment.
  25  * But the dictionary's format coincide with the other word recite software
  26  * to help the users get more available data. And the review times designed
  27  * by means of the theory named Forgetting Curve which dicoveried by the
  28  * German psychologist named Hermann Ebbinghaus(1850–1909).
  29  *
  30  **/
  31
  32 #ifndef FORGETCURVE_H
  33 #define FORGETCURVE_H
  34
  35 #include <ctime>
  36
  37 namespace freeRecite {
  38
  39 class ForgetCurve;
  40
  41 extern ForgetCurve forgetCurve;
  42
  43 class ForgetCurve
  44 {
  45  public:
  46   ForgetCurve();
  47   ~ForgetCurve()
  48   { /* Do Nothing! */ }
  49
  50   time_t getReviewTime(int curOrder) const;
  51   bool pass(int curOrder,int curMark)const;
  52
  53 private:
  54   time_t interval[8];
  55   int    mark[8];
  56 };
  57
  58 inline bool ForgetCurve::pass(int curOrder,int curMark) const{
  59   if(curMark >= mark[curOrder])
  60     return true;
  61   else
  62     return false;
  63 }
  64
  65 } //namespace freeRecite end
  66
  67 #endif