activeTypeStatelessTape.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 "../config.h"
#include "../misc/macros.hpp"
#include "../tapes/interfaces/fullTapeInterface.hpp"
#include "../traits/realTraits.hpp"
#include "assignmentOperators.hpp"
#include "incrementOperators.hpp"
#include "lhsExpressionInterface.hpp"
 
namespace codi {
 
  template<typename T_Tape>
  struct ActiveTypeStatelessTape : public LhsExpressionInterface<typename T_Tape::Real, typename T_Tape::Gradient,
                                                                 T_Tape, ActiveTypeStatelessTape<T_Tape>>,
                                   public AssignmentOperators<T_Tape, ActiveTypeStatelessTape<T_Tape>>,
                                   public IncrementOperators<T_Tape, ActiveTypeStatelessTape<T_Tape>> {
    public:
 
      using Tape = CODI_DD(T_Tape, CODI_DEFAULT_TAPE);  
 
      using Real = typename Tape::Real;                   
      using PassiveReal = RealTraits::PassiveReal<Real>;  
      using Identifier = typename Tape::Identifier;       
      using Gradient = typename Tape::Gradient;           
 
      using Base = LhsExpressionInterface<Real, Gradient, T_Tape, ActiveTypeStatelessTape<T_Tape>>;  
 
    private:
 
      Real primalValue;
      Identifier identifier;
 
    public:
 
      constexpr CODI_INLINE_NO_FA ActiveTypeStatelessTape() = default;
 
      constexpr CODI_INLINE ActiveTypeStatelessTape(PassiveReal const& value) : primalValue(value), identifier() {}
 
      CODI_INLINE ActiveTypeStatelessTape(ActiveTypeStatelessTape const& v) : primalValue(), identifier() {
        Base::init(v.getValue(), EventHints::Statement::Copy);
        getTape().store(*this, v);
      }
 
      template<typename Rhs>
      CODI_INLINE ActiveTypeStatelessTape(ExpressionInterface<Real, Rhs> const& rhs) : primalValue(), identifier() {
        Base::init(rhs.cast().getValue(), EventHints::Statement::Expression);
        getTape().store(*this, rhs.cast());
      }
 
      /*******************************************************************************/
 
      CODI_INLINE ActiveTypeStatelessTape& operator=(ActiveTypeStatelessTape const& v) {
        static_cast<Base&>(*this) = static_cast<Base const&>(v);
        return *this;
      }
 
      using Base::operator=;
 
      /*******************************************************************************/
 
      using StoreAs = ActiveTypeStatelessTape const&;  
      using ActiveResult = ActiveTypeStatelessTape;    
 
      /*******************************************************************************/
 
      CODI_INLINE Identifier& getIdentifier() {
        return identifier;
      }
 
      CODI_INLINE Identifier const& getIdentifier() const {
        return identifier;
      }
 
      CODI_INLINE Real& value() {
        return primalValue;
      }
 
      CODI_INLINE Real const& value() const {
        return primalValue;
      }
 
      static CODI_INLINE Tape getTape() {
        return Tape();
      }
 
  };
}