dft_tools/triqs/mc_tools/mc_basic_step.hpp

/*******************************************************************************
 *
 * TRIQS: a Toolbox for Research in Interacting Quantum Systems
 *
 * Copyright (C) 2011 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 MC_STEPS_H
#define MC_STEPS_H

#include <boost/mpi.hpp>
#include "mc_move_set.hpp"

namespace triqs {
namespace mc_tools {
 namespace Step {

  // Performs one Metropolis step
  template <typename MCSignType> struct Metropolis {
   static void do_it(move_set<MCSignType>& MoveGroup, random_generator& RNG, MCSignType& signe) {
    double r = MoveGroup.attempt();
    if (RNG() < std::min(1.0, r)) {
#ifdef TRIQS_MCTOOLS_DEBUG
     std::cerr << " Move accepted " << std::endl;
#endif
     signe *= MoveGroup.accept();
#ifdef TRIQS_MCTOOLS_DEBUG
     std::cerr << " New sign = " << signe << std::endl;
#endif
    } else {
#ifdef TRIQS_MCTOOLS_DEBUG
     std::cerr << " Move rejected " << std::endl;
#endif
     MoveGroup.reject();
    }
   }
  };

  // Put heat Bath here ....
 }
}
}
#endif