compileTimeLoop.hpp

/*
 * CoDiPack, a Code Differentiation Package
 *
 * Copyright (C) 2015-2025 Chair for Scientific Computing (SciComp), University of Kaiserslautern-Landau
 * Homepage: http://scicomp.rptu.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://scicomp.rptu.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 <utility>
 
#include "../config.h"

namespace codi {

  template<size_t T_pos, size_t T_end, int T_step>
  struct CompileTimeLoop {
    public:
 
      static size_t constexpr pos = T_pos;  
      static size_t constexpr end = T_end;  
      static int constexpr step = T_step;   

      template<typename Func, typename... Args>
      static CODI_INLINE void eval(Func&& func, Args&&... args) {
        func(std::integral_constant<size_t, pos>{}, std::forward<Args>(args)...);
        CompileTimeLoop<pos + step, end, step>::eval(std::forward<Func>(func), std::forward<Args>(args)...);
      }
  };

  template<size_t T_pos, int T_step>
  struct CompileTimeLoop<T_pos, T_pos, T_step> {
    public:
 
      static size_t constexpr pos = T_pos;  
      static size_t constexpr end = T_pos;  
      static int constexpr step = T_step;   

      template<typename... Args>
      static CODI_INLINE void eval(Args&&... args) {
        CODI_UNUSED(args...);
      }
  };

  template<std::size_t N, typename F, typename... Args>
  CODI_INLINE void static_for(F func, Args&&... args) {
    CompileTimeLoop<0, N, 1>::eval(func, std::forward<Args>(args)...);
  }
}