duplicateJacobianRemover.hpp

/*
 * CoDiPack, a Code Differentiation Package
 *
 * Copyright (C) 2015-2024 Chair for Scientific Computing (SciComp), University of Kaiserslautern-Landau
 * Homepage: http://www.scicomp.uni-kl.de
 * Contact:  Prof. Nicolas R. Gauger (codi@scicomp.uni-kl.de)
 *
 * Lead developers: Max Sagebaum, Johannes Blühdorn (SciComp, University of Kaiserslautern-Landau)
 *
 * This file is part of CoDiPack (http://www.scicomp.uni-kl.de/software/codi).
 *
 * CoDiPack 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.
 *
 * CoDiPack 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 CoDiPack.
 * If not, see <http://www.gnu.org/licenses/>.
 *
 * For other licensing options please contact us.
 *
 * Authors:
 *  - SciComp, University of Kaiserslautern-Landau:
 *    - Max Sagebaum
 *    - Johannes Blühdorn
 *    - Former members:
 *      - Tim Albring
 */
#pragma once
 
#include <array>
 
#include "../../config.h"
#include "../../misc/macros.hpp"
 
namespace codi {
 
  template<typename T_Real, typename T_Identifier>
  struct DuplicateJacobianRemover {
    public:
 
      using Real = CODI_DD(T_Real, double);           
      using Identifier = CODI_DD(T_Identifier, int);  
      using ArgumentSize = Config::ArgumentSize;      
 
    private:
      std::array<Identifier, Config::MaxArgumentSize> indices;
      std::array<Real, Config::MaxArgumentSize> jacobians;
      ArgumentSize size;
 
    public:
 
      DuplicateJacobianRemover() = default;
 
      CODI_INLINE void pushData(Real const& jacobian, Identifier const& index) {
        bool found = false;
        ArgumentSize pos;
        for (pos = 0; pos < size; pos += 1) {
          if (indices[pos] == index) {
            found = true;
            break;
          }
        }
 
        if (!found) {
          size += 1;
          indices[pos] = index;
          jacobians[pos] = jacobian;
        } else {
          jacobians[pos] += jacobian;
        }
      }
 
      template<typename Vec>
      CODI_INLINE void storeData(Vec& vec) {
        for (ArgumentSize pos = 0; pos < size; pos += 1) {
          vec.pushData(jacobians[pos], indices[pos]);
        }
 
        // Reset the data for the next statement.
        size = 0;
      }
  };
}