filter.hh

// This file is a part of Aurelia.
// Copyright (C) 2010  Valentin David
// Copyright (C) 2010  University of Bergen
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
#ifndef __FILTER_HH
# define __FILTER_HH

namespace aurelia {

template <typename Out, typename Strat>
struct filter_strategy {
private:
  Strat s;

public:
  filter_strategy(const Strat& s): s(s) {}

  template <typename T>
  Out operator()(const T& t) const {
    Out ret;

    for (typename T::const_iterator i = t.begin(); i != t.end(); ++i) {
      try {
        ret.insert(ret.end(), s(*i));
      }
      catch (failure) {}
    }
    return ret;
  }
};

template <typename Out, typename Strat>
filter_strategy<Out, Strat> filter(const Out&, const Strat& s) {
  return filter_strategy<Out, Strat>(s);
}

}

#endif