pfstar.cc

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// pf* implementation -*- C++ -*-

// $Id: dbtools.cc 634 2008-05-20 14:28:14Z herman $
// Copyright (C) 2003 Hermann Schichl
//
// This file is part of the COCONUT API.  This library
// is free software; you can redistribute it and/or modify it under the
// terms of the Library GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// Library GNU General Public License for more details.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the Library GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the Library GNU General Public License.

#include <coconut_config.h>
#include <search_graph.h>
#include <pfstar.h>

#define PFSTAR_DEBUG 0

namespace coco {

double calc_pf_star::operator() () const
{
  typedef expression_walker nodeptr;
  double lowbnd, width;

  bool error;
  const vdbl::col& _ca(_r->get_col(x_lowbnd, error));
  if(error) return false;
  _ca.get(lowbnd);

  const vdbl::col& _cb(_r->get_col(x_width, error));
  if(error) return false;
  _cb.get(width);

  const gptr<search_graph> *psg = sgc->sg();
  const vdbl::viewdbase& vdb((*psg)->get_viewdbase());
  const vdbl::view *iv((vdbl::view*)vdb.get_view("global info"));
  vdbl::view::row_const_iterator rc(iv->rows_begin());
  double fmin;

  if(rc != iv->rows_end())
  {
    basic_alltype b;
    iv->get(rc.id(), "fmin", b);
    fmin = b.nd();
  }
  else
    fmin = COCO_INF;


#if PFSTAR_DEBUG
  std::cout << "in calc_pf_star::operator(): ";
  std::cout << "lowbnd: " << lowbnd << " "
            << "width: " << width << " "
            << "fmin: " << fmin << std::endl;
#endif
  
  double ret;
  if(width > 0)
    ret = (fmin - lowbnd)/width;
  else
    ret = 0;
  return ret;
}

} // namespace coco

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