atom_predicates.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) 2002, Tim Robertson <kid50@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_PREDICATES_H
#define BTK_ATOM_PREDICATES_H


namespace BTK {

  // this is only here to be a defualt argument
  struct is_any {
    template <typename AtomType>
    bool operator()(AtomType& a){
      return true;
    }
  };

  struct is_calpha {
    template <typename AtomType>
    bool operator()(AtomType& a){
      return (a.atom_index() == ATOM::CA);
    }
  };

  struct is_protein_bb {
    template <typename AtomType>
    bool operator()(AtomType& a){
      return (a.atom_index() == ATOM::CA ||
              a.atom_index() == ATOM::C  ||
              a.atom_index() == ATOM::N );
    }
  };

  struct is_group_num_gt {
    is_group_num_gt(int n) : _n(n) {}

    template <typename AtomType>
    bool operator()(AtomType& a){
      return a.group_num() > _n;
    }

    int _n;
  };

  struct is_group_num_lt {
    is_group_num_lt(int n) : _n(n) {}

    template <typename AtomType>
    bool operator()(AtomType& a){
      return a.group_num() < _n;
    }

    int _n;
  };

  struct is_selected {
    template <typename AtomType>
    bool operator()(AtomType& a){
      return a.is_selected();
    }
  };

}

#endif

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