rpg/solvers/Propagator.h

#ifndef RPG_PROPAGATOR_H
#define RPG_PROPAGATOR_H
 
/*
* PSCF - Polymer Self-Consistent Field
*
* Copyright 2015 - 2025, The Regents of the University of Minnesota
* Distributed under the terms of the GNU General Public License.
*/
 
#include <pscf/solvers/PropagatorTmpl.h> // base class template
 
#include <prdc/cuda/RField.h>            // member
#include <pscf/cuda/DeviceArray.h>       // member 
#include <util/containers/DArray.h>      // member array
 
 
// Forward declarations
namespace Pscf { 
   template <int D> class Mesh; 
   namespace Rpg {
      template <int D> class Block;
   }
}
 
namespace Pscf {
namespace Rpg {
 
   using namespace Util;
   using namespace Pscf::Prdc;
   using namespace Pscf::Prdc::Cuda;

   template <int D>
   class Propagator : public PropagatorTmpl< Propagator<D> >
   {
 
   public:
 
      // Public typename aliases 

      using Base = PropagatorTmpl< Propagator<D> >;
      

      using FieldT = RField<D>;
 
      // Member functions

      Propagator();

      ~Propagator();

      void setBlock(Block<D>& block);

      void allocate(int ns, const Mesh<D>& mesh);

      void reallocate(int ns);

      void solve();

      void solve(RField<D> const & head);

      double computeQ();

      RField<D> const & q(int i) const;

      RField<D> const & head();

      RField<D> const & tail() const;

      DeviceArray<cudaReal> const & qAll();

      Block<D>& block();

      Block<D> const & block() const;

      int ns() const;

      bool isAllocated() const;
 
      // Inherited public members with non-dependent names
 
      using Base::nSource;
      using Base::source;
      using Base::partner;
      using Base::setIsSolved;
      using Base::isSolved;
      using Base::hasPartner;
      using Base::isHeadEnd;
      using Base::isTailEnd;
 
   private:

      DeviceArray<cudaReal> qFieldsAll_;

      DArray< RField<D> > qFields_;

      Block<D>* blockPtr_;

      Mesh<D> const * meshPtr_;

      int ns_;

      bool isAllocated_;

      void computeHead();
 
   };
 
   // Inline member functions
 
   /*
   * Return q-field at initial (head) vertex of block.
   */
   template <int D>
   inline
   RField<D> const & Propagator<D>::head()
   {
      UTIL_CHECK(isSolved());
      return qFields_[0];
   }
 
   /*
   * Return q-field at final (tail) vertex of block.
   */
   template <int D>
   inline
   RField<D> const & Propagator<D>::tail() const
   {
      UTIL_CHECK(isSolved());
      UTIL_CHECK(PolymerModel::isThread() || !isTailEnd());
      return qFields_[ns_-1];
   }
 
   /*
   * Return const q-field at specified step by reference.
   */
   template <int D>
   inline
   RField<D> const & Propagator<D>::q(int i) const
   {
      UTIL_CHECK(isSolved());
      return qFields_[i];
   }
 
   /*
   * Return the full array of q-fields.
   */
   template <int D>
   inline
   DeviceArray<cudaReal> const & Propagator<D>::qAll()
   {
      UTIL_CHECK(isSolved());
      return qFieldsAll_;
   }
 
   /*
   * Get the associated Block object (non-const reference)
   */
   template <int D>
   inline
   Block<D>& Propagator<D>::block()
   {
      assert(blockPtr_);
      return *blockPtr_;
   }
 
   /*
   * Get the associated Block object (const reference)
   */
   template <int D>
   inline
   Block<D> const & Propagator<D>::block() const
   {
      assert(blockPtr_);
      return *blockPtr_;
   }
 
   /*
   * Get the number ns of chain contour points.
   */
   template <int D>
   inline
   int Propagator<D>::ns() const
   {  return ns_; }
 
   template <int D>
   inline
   bool Propagator<D>::isAllocated() const
   {  return isAllocated_; }
 
   /*
   * Associate this propagator with a block and direction
   */
   template <int D>
   inline
   void Propagator<D>::setBlock(Block<D>& block)
   {  blockPtr_ = &block; }
 
   // Explicit instantiation declarations
   extern template class Propagator<1>;
   extern template class Propagator<2>;
   extern template class Propagator<3>;
 
}
}
#endif