map_join.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 __MAP_JOIN_HH
# define __MAP_JOIN_HH

namespace aurelia {

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

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

    template <typename T>
    Out operator()(const T& t) const {
      typedef strategy_concept<strategy_model<Strat, typename T::value_type> >
        require;

      Out ret;

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

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

}

#endif