Range.h

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// -*- C++ -*-

// PLearn (A C++ Machine Learning Library)
// Copyright (C) 1998 Pascal Vincent
// Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio and University of Montreal
//

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//  1. Redistributions of source code must retain the above copyright
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//  2. Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
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//     products derived from this software without specific prior written
//     permission.
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// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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// This file is part of the PLearn library. For more information on the PLearn
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/* *******************************************************      
   * $Id: Range.h,v 1.2 2004/02/20 21:11:42 chrish42 Exp $
   * AUTHORS: Pascal Vincent & Yoshua Bengio
   * This file is part of the PLearn library.
   ******************************************************* */

// See Mat.h for a description the PLearn native binary file format for matrices and vectors (.pmat .pvec)


#ifndef Range_INC
#define Range_INC

namespace PLearn {
using namespace std;

  class Range
  {
    public:
      int start; 
      int length; 
      
      Range(int the_start=0, int the_length=0)
        :start(the_start), length(the_length) {}
      
      bool isEmpty() { return length<=0; }

      bool operator==(Range r) const
      { return start==r.start && length==r.length; }

      bool operator<(Range r) const
      { return start<r.start || (start==r.start && length<r.length); }

      operator void*() { return (length>0 ? this : 0); }
  };
  
  inline ostream& operator<<(ostream& out, Range r)
  { 
    out << "[" << r.start << "," << r.start+r.length-1 << "]"; 
    return out;
  }

} // end of namespace PLearn

#endif

---