dft_tools/triqs/gfs/domains/legendre.hpp

/*******************************************************************************
 *
 * 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/>.
 *
 ******************************************************************************/
#pragma once
#include "../tools.hpp"

namespace triqs {
namespace gfs {

 class legendre_domain {

  public:
  double beta;
  statistic_enum statistic;
  size_t Nmax;

  using point_t = long;
  size_t size() const {
   return Nmax;
  };

  legendre_domain(double beta_ = 1, statistic_enum stat_ = Fermion, size_t Nmax_ = 1)
     : beta(beta_), statistic(stat_), Nmax(Nmax_) {}

  bool operator==(legendre_domain const& D) const {
   return ((std::abs(beta - D.beta) < 1.e-15) && (statistic == D.statistic) && (Nmax == D.Nmax));
  }

  /// Write into HDF5
  friend void h5_write(h5::group fg, std::string subgroup_name, legendre_domain const& d) {
   h5::group gr = fg.create_group(subgroup_name);
   h5_write(gr, "n_max", d.Nmax);
   h5_write(gr, "beta", d.beta);
   h5_write(gr, "statistic", (d.statistic == Fermion ? "F" : "B"));
  }

  /// Read from HDF5
  friend void h5_read(h5::group fg, std::string subgroup_name, legendre_domain& d) {
   h5::group gr = fg.open_group(subgroup_name);
   long n;
   double beta;
   std::string statistic;
   h5_read(gr, "n_max", n);
   h5_read(gr, "beta", beta);
   h5_read(gr, "statistic", statistic);
   d = legendre_domain(beta, (statistic == "F" ? Fermion : Boson), n);
  }

  //  BOOST Serialization
  friend class boost::serialization::access;
  template <class Archive> void serialize(Archive& ar, const unsigned int version) {
   ar& boost::serialization::make_nvp("n_max", Nmax);
   ar& boost::serialization::make_nvp("beta", beta);
   ar& boost::serialization::make_nvp("statistic", statistic);
  }
 };
}
}