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objbounds_hook.h

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// Search Node objbounds computation hook implementation -*- C++ -*-

// 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.

#ifndef _OBJBOUNDS_HOOK_H
#define _OBJBOUNDS_HOOK_H

#include <comp_hook.h>

class objbounds_comp_hook : protected work_node_comp_hook
{
public:
  objbounds_comp_hook() : __work_node_comp_hook("objbounds"), __managed_cols();

  virtual ~objbounds_comp_hook() {}

  void operator()(const work_node& wn, dbt_row& dbr)
  {
    interval _h(0.);
    double _s;
    if((_s = wn.get_model()->ocoeff) != 0)
      _h = wn.node_ranges[wn.get_model()->objective->node_num]*_s;
    add_to_dbt_row(dbr, "obj lowbound", _h.inf());
    add_to_dbt_row(dbr, "obj upbound", _h.sup());
  }

  bool init_columns(vdbl::standard_table& stable)
  {
    bool ret = _init_column(stable, "obj lowbound", -INFINITY);
    ret = _init_column(stable, "obj upbound", INFINITY) || ret;
    return ret;
  }

  bool drop_columns(vdbl::standard_table& stable)
        { return _drop_columns(stable); }
};

#endif // _OBJBOUNDS_HOOK_H

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