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diff --git a/kcron/ctunit.h b/kcron/ctunit.h
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+/***************************************************************************
+ *   CT Unit of Time Interval Header                                       *
+ *   --------------------------------------------------------------------  *
+ *   Copyright (C) 1999, Gary Meyer <gary@meyer.net>                       *
+ *   --------------------------------------------------------------------  *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   * 
+ ***************************************************************************/
+
+#ifndef CTUNIT_H
+#define CTUNIT_H
+
+// Do not introduce any Qt or KDE dependencies into the "CT"-prefixed classes.
+// I want to be able to reuse these classes with another GUI toolkit. -GM 11/99
+
+#include <string>
+#include <iostream>
+
+/**
+  * A cron table unit parser and tokenizer.
+  * Parses/tokenizes unit such as "0-3,5,6,10-30/5"
+  * Also provides default natural language description.
+  */
+template<int min, int max> class CTUnit
+{
+public:
+
+/**
+  * Constant indicating short format.
+  */
+  static const bool shortFormat = 0;
+
+/**
+  * Constant indicating long format.
+  */
+  static const bool longFormat = 1;
+
+/**
+  * Initialize including parsing and saving initial image.
+  */
+  CTUnit(const std::string &tokStr = "");
+
+/**
+  * Base initial image as empty and copy enabled intervals.
+  */
+  CTUnit(const CTUnit& source);
+
+/**
+  * Destructor.
+  */
+  virtual ~CTUnit();
+
+/**
+  * Copy enabled intervals.
+  */
+  void operator = (const CTUnit<min,max>& unit);
+
+/**
+  * Returns tokenization to output stream.
+  */
+  friend std::ostream& operator << (std::ostream& outStr, const CTUnit<min,max>& unit)
+  {
+    if (unit.count() == (max - min + 1))
+       outStr << "*";
+    else 
+       outStr << ((const CTUnit<min, max>) unit).tokenize();
+    return outStr;
+  };
+
+/**
+  * Parses unit such as "0-3,5,6,10-30/5".
+  * And initialize array of enabled intervals.
+  */
+  void initialize(const std::string &tokStr = "");
+
+/**
+  * Parses unit such as "0-3,5,6,10-30/5".
+  * Does not initialize array of enabled intervals.
+  */
+  void parse(std::string tokStr = "");
+  
+/**
+  * Tokenizes unit into string such as
+  * "0,1,2,3,5,6,10,15,20,25,30".
+  */
+  std::string tokenize() const;
+
+/**
+  * Get default natural language description.
+  */
+  virtual std::string describe(const std::string *label) const;
+
+/**
+  * Lower bound.
+  */
+  int begin();
+
+/**
+  * Upper bound.
+  */
+  int end();
+
+/**
+  * Accessor.
+  */
+  bool get(int pos) const;
+
+/**
+  * Mutator.
+  */
+  void set(int pos, bool value);
+
+/**
+  * Enable.
+  */
+  void enable(int pos);
+
+/**
+  * Disable.
+  */
+  void disable(int pos);
+
+/**
+  * Indicates whether enabled intervals have been modified.
+  */
+  bool dirty() const;
+
+/**
+  * Total count of enabled intervals.
+  */
+  int count() const;
+
+/**
+  * Mark changes as applied.
+  */
+  void apply();
+
+/**
+  * Mark cancel changes and revert to initial or last applied
+  * image.
+  */
+  void cancel();
+
+private:
+
+  int fieldToValue(std::string entry) const;
+  bool isDirty;
+  bool enabled[max+1];
+  bool initialEnabled[max+1];
+  std::string initialTokStr;
+
+};
+
+#include "ctunit.cpp"
+
+#endif // CTUNIT_H