atom_index_pair.h

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// -*- mode: c++; -*-
//
//The Biomolecule Toolkit (BTK) is a C++ library for use in the
//modeling, analysis, and design of biological macromolecules.
//Copyright (C) 2004, Christopher Saunders <ctsa@users.sourceforge.net>
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU Lesser General Public License as published
//by the Free Software Foundation; either version 2.1 of the License, or (at
//your option) any later version.
//
//This program 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 GNU
//Lesser General Public License for more details. 
//
//You should have received a copy of the GNU Lesser General Public License 
//along with this program; if not, write to the Free Software Foundation, 
//Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//


#ifndef BTK_ATOM_INDEX_PAIR_H
#define BTK_ATOM_INDEX_PAIR_H

#include "atom_types.h"

#include <algorithm>
#include <utility>


namespace BTK{

  struct AtomIndexPair {
    typedef std::pair<int,ATOM::index_t> monomer_atom_idx_t;

    AtomIndexPair() {}
    
    AtomIndexPair(monomer_atom_idx_t atom_index1,
                  monomer_atom_idx_t atom_index2)
      : _atom_index1(atom_index1),
        _atom_index2(atom_index2)
    {
      if(_atom_index1>_atom_index2) std::swap(_atom_index1,_atom_index2);
    }

    bool
    operator<(const AtomIndexPair& right) const
    {
      if ( _atom_index1 == right._atom_index1 )
        return _atom_index2 < right._atom_index2;
      else 
        return _atom_index1 < right._atom_index1;
    }

    monomer_atom_idx_t atom_index1() const { return _atom_index1; }
    monomer_atom_idx_t atom_index2() const { return _atom_index2; }
    
  private:
    monomer_atom_idx_t _atom_index1;
    monomer_atom_idx_t _atom_index2;
  };

}

#endif

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