/*******************************************************************************
 *
 * TRIQS: a Toolbox for Research in Interacting Quantum Systems
 *
 * Copyright (C) 2012 by M. Ferrero, O. Parcollet
 *
 * TRIQS 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.
 *
 * TRIQS 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
 * TRIQS. If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/
#ifndef TRIQS_GF_MESHTOOLS_H
#define TRIQS_GF_MESHTOOLS_H
#include "../tools.hpp"
#include <triqs/utility/arithmetic_ops_by_cast.hpp>

namespace triqs {
namespace gfs {

 template<typename MeshType>
  class mesh_pt_generator : 
   public boost::iterator_facade< mesh_pt_generator<MeshType>, typename MeshType::mesh_point_t , boost::forward_traversal_tag, 
   typename MeshType::mesh_point_t const & > {
    friend class boost::iterator_core_access;
    MeshType const * mesh;
    size_t u;
    typename MeshType::mesh_point_t pt;
    typename MeshType::mesh_point_t const & dereference() const { return pt;}
    bool equal(mesh_pt_generator const & other) const { return ((other.u==u) );}
    // do NOT check = of mesh, otherwise e.g. block iterator does not work (infinite loop...)
    //bool equal(mesh_pt_generator const & other) const { return ((mesh == other.mesh) && (other.u==u) );}
    public:
    mesh_pt_generator(): mesh(nullptr), u(0) {}
    mesh_pt_generator( MeshType const * m, bool atEnd = false): mesh(m), u(atEnd ? m->size(): 0), pt(*m) {}
    void increment() { ++u; pt.advance(); }
    bool at_end() const { return (u>=mesh->size());}
    typename MeshType::domain_t::point_t to_point() const { return pt;}    
   };

}}
#endif