build.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 __BUILD_HH
# define __BUILD_HH

# include "../../patterns/pattern.hh"
# include "../strategies.hh"

namespace aurelia {

  template <typename T>
  struct build_strategy {
    typedef typename pattern_model<T>::model pat_mod;
    typedef typename pattern_concept<pat_mod>::check require;
    T pat;
  public:
    build_strategy(const T& pat): pat(pat) {
    }

    template <typename Y>
    typename pat_mod::build_type operator()(const Y&) const {
      return *pat;
    }
  };

  template <typename Pool>
  struct build_strategy<untyped_term<Pool> > {
  private:
    untyped_term<Pool> t;
  public:
    build_strategy(const untyped_term<Pool>& t): t(t) {
    }

    template <typename T>
    untyped_term<Pool> operator()(const T&) const {
      return t;
    }
  };
  /* @} */

  template <typename Pool, typename List>
  build_strategy<untyped_pattern<Pool, List> >
  operator!(const untyped_pattern<Pool, List>& p) {
    return build_strategy<untyped_pattern<Pool, List> >(p);
  }

  template <typename T>
  build_strategy<variable<T> > operator!(const variable<T>& v) {
    return build_strategy<variable<T> >(v);
  }

  template <typename Pattern,
            typename PattermModel = typename pattern_model<Pattern>::model>
  build_strategy<Pattern> operator!(const Pattern& pattern) {
    return build_strategy<Pattern>(pattern);
  }
}

#endif