float_plus.h

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#ifndef FLOAT_PLUS_CLASS
#define FLOAT_PLUS_CLASS

/*****************************************************************************\
*                                                                             *
*  Name   : floating point extension class                                    *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 1993-$now By Author.  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.  This is online at:      *
*     http://www.fsf.org/copyleft/gpl.html                                    *
* Please send any updates to: fred@gruntose.com                               *
\*****************************************************************************/

#include <basis/definitions.h>


template <class contents>
class float_plus
{
public:
  #define DEFAULT_DELTA 0.0001


  float_plus(contents init = 0.0, contents delta = DEFAULT_DELTA)
              : _value(init), _delta(delta) {}

  float_plus(const float_plus &to_copy)
              : _value(to_copy._value), _delta(to_copy._delta) {}

  float_plus &operator = (const float_plus &cp)
              { _value = cp._value; _delta = cp._delta; return *this; }

  inline contents value() const { return _value; }
  inline operator contents () const { return _value; }

  inline contents delta() const { return _delta; }
  inline void delta(contents new_delta) { _delta = new_delta; }

  bool operator == (const float_plus &to_compare) { return d_eq(to_compare); }
  bool operator != (const float_plus &to_compare) { return !d_eq(to_compare); }
  bool operator < (const float_plus &to_compare)
              { return !d_eq(to_compare) && (_value < to_compare); }
  bool operator > (const float_plus &to_compare)
              { return !d_eq(to_compare) && (_value > to_compare); }
  bool operator <= (const float_plus &to_compare)
              { return _value < to_compare || d_eq(to_compare); }
  bool operator >= (const float_plus &to_compare)
              { return _value > to_compare || d_eq(to_compare); }

private:
  contents _value;  
  contents _delta;  

  bool d_eq(contents to_compare) {
    contents diff = absolute_value(_value - to_compare);
    return diff < absolute_value(_delta); 
  }
};

#endif

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