Executable for MC: initialize background

src/DataStructures/Variables.hpp

@@ -594,6 +594,11 @@ class Variables<tmpl::list<>> {
   template <typename T>
   Variables(const T* /*pointer*/, const size_t /*size*/) {}
   static constexpr size_t size() { return 0; }
+  static constexpr size_t number_of_grid_points() { return 0; }
+  void assign_subset(const Variables<tmpl::list<>>& /*unused*/) {}
+  void assign_subset(const tuples::TaggedTuple<>& /*unused*/) {}
+  // Initialization for empty variables should ignore any input.
+  void initialize(size_t /*number_of_grid_points*/) {}
 };
 
 // gcc8 screams when the empty Variables has pup as a member function, so we

src/Evolution/DgSubcell/Actions/Initialize.hpp

@@ -103,7 +103,8 @@ struct SetSubcellGrid {
       subcell::Tags::ReconstructionOrder<Dim>,
       evolution::dg::subcell::Tags::InterpolatorsFromFdToNeighborFd<Dim>,
       evolution::dg::subcell::Tags::InterpolatorsFromDgToNeighborFd<Dim>,
-      evolution::dg::subcell::Tags::InterpolatorsFromNeighborDgToFd<Dim>>;
+      evolution::dg::subcell::Tags::InterpolatorsFromNeighborDgToFd<Dim>,
+      typename System::variables_tag>;
   using compute_tags =
       tmpl::list<Tags::MeshCompute<Dim>, Tags::LogicalCoordinatesCompute<Dim>,
                  ::domain::Tags::MappedCoordinates<

src/Evolution/DgSubcell/BackgroundGrVars.hpp

@@ -142,10 +142,13 @@ struct BackgroundGrVars : tt::ConformsTo<db::protocols::Mutator> {
             cell_centered_impl(active_gr_vars, time, subcell_inertial_coords,
                                solution_or_data);
           }
-
-          face_centered_impl(subcell_face_gr_vars, time, functions_of_time,
-                             logical_to_grid_map, grid_to_inertial_map,
-                             subcell_mesh, solution_or_data);
+          if constexpr (not std::is_same_v<
+                        typename SubcellFaceGrVars::value_type::tags_list,
+                        tmpl::list<>>){
+            face_centered_impl(subcell_face_gr_vars, time, functions_of_time,
+                               logical_to_grid_map, grid_to_inertial_map,
+                               subcell_mesh, solution_or_data);
+          }
         }
       }
 
@@ -158,19 +161,23 @@ struct BackgroundGrVars : tt::ConformsTo<db::protocols::Mutator> {
              "The subcell mesh must have isotropic basis, quadrature. and "
              "extents but got "
                  << subcell_mesh);
-      const size_t num_face_centered_mesh_grid_pts =
-          (subcell_mesh.extents(0) + 1) * subcell_mesh.extents(1) *
-          subcell_mesh.extents(2);
-      for (size_t d = 0; d < volume_dim; ++d) {
-        gsl::at(*subcell_face_gr_vars, d)
-            .initialize(num_face_centered_mesh_grid_pts);
+      if constexpr (not std::is_same_v<
+                    typename SubcellFaceGrVars::value_type::tags_list,
+                    tmpl::list<>>){
+        const size_t num_face_centered_mesh_grid_pts =
+            (subcell_mesh.extents(0) + 1) * subcell_mesh.extents(1) *
+            subcell_mesh.extents(2);
+        for (size_t d = 0; d < volume_dim; ++d) {
+          gsl::at(*subcell_face_gr_vars, d)
+              .initialize(num_face_centered_mesh_grid_pts);
+        }
+        face_centered_impl(subcell_face_gr_vars, time, functions_of_time,
+                           logical_to_grid_map, grid_to_inertial_map,
+                           subcell_mesh, solution_or_data);
       }
 
       cell_centered_impl(inactive_gr_vars, time, subcell_inertial_coords,
                          solution_or_data);
-      face_centered_impl(subcell_face_gr_vars, time, functions_of_time,
-                         logical_to_grid_map, grid_to_inertial_map,
-                         subcell_mesh, solution_or_data);
     }
   }
 

src/Evolution/Executables/RadiationTransport/CMakeLists.txt

@@ -2,3 +2,4 @@
 # See LICENSE.txt for details.
 
 add_subdirectory(M1Grey)
+add_subdirectory(MonteCarlo)

src/Evolution/Executables/RadiationTransport/MonteCarlo/CMakeLists.txt

@@ -0,0 +1,45 @@
+# Distributed under the MIT License.
+# See LICENSE.txt for details.
+
+set(EXECUTABLE EvolveMonteCarlo)
+
+add_spectre_executable(
+  ${EXECUTABLE}
+  EXCLUDE_FROM_ALL
+  EvolveMonteCarlo.cpp
+  )
+
+target_link_libraries(
+  ${EXECUTABLE}
+  PRIVATE
+  Actions
+  Charmxx::main
+  CoordinateMaps
+  DataStructures
+  DgSubcell
+  DiscontinuousGalerkin
+  DomainCreators
+  Events
+  EventsAndDenseTriggers
+  EventsAndTriggers
+  Evolution
+  GeneralRelativity
+  GeneralRelativitySolutions
+  GrMhdAnalyticData
+  GrMhdSolutions
+  H5
+  Hydro
+  Informer
+  LinearOperators
+  MathFunctions
+  MonteCarlo
+  Observer
+  Options
+  Parallel
+  PhaseControl
+  Serialization
+  Time
+  Utilities
+  ValenciaDivClean
+  )
+

src/Evolution/Executables/RadiationTransport/MonteCarlo/EvolveMonteCarlo.cpp

@@ -0,0 +1,33 @@
+// Distributed under the MIT License.
+// See LICENSE.txt for details.
+
+#include "Evolution/Executables/RadiationTransport/MonteCarlo/EvolveMonteCarlo.hpp"
+
+#include <vector>
+
+#include "Domain/Creators/RegisterDerivedWithCharm.hpp"
+#include "Domain/Creators/TimeDependence/RegisterDerivedWithCharm.hpp"
+#include "Domain/FunctionsOfTime/RegisterDerivedWithCharm.hpp"
+#include "Parallel/CharmMain.tpp"
+#include "PointwiseFunctions/Hydro/EquationsOfState/RegisterDerivedWithCharm.hpp"
+#include "Utilities/Serialization/RegisterDerivedClassesWithCharm.hpp"
+
+void register_neutrino_tables() {
+  register_classes_with_charm(
+      tmpl::list<Particles::MonteCarlo::NeutrinoInteractionTable<2, 2>,
+                 Particles::MonteCarlo::NeutrinoInteractionTable<2, 3>,
+                 Particles::MonteCarlo::NeutrinoInteractionTable<4, 3>,
+                 Particles::MonteCarlo::NeutrinoInteractionTable<16, 3>>{});
+}
+
+extern "C" void CkRegisterMainModule() {
+  Parallel::charmxx::register_main_module<EvolutionMetavars<4, 3>>();
+  Parallel::charmxx::register_init_node_and_proc(
+      {&domain::creators::register_derived_with_charm,
+       &domain::creators::time_dependence::register_derived_with_charm,
+       &domain::FunctionsOfTime::register_derived_with_charm,
+       &EquationsOfState::register_derived_with_charm,
+       &register_factory_classes_with_charm<EvolutionMetavars<4, 3>>,
+       &register_neutrino_tables},
+      {});
+}