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// ------------------------------------------------------------------------
//
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2018 - 2025 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Part of the source code is dual licensed under Apache-2.0 WITH
// LLVM-exception OR LGPL-2.1-or-later. Detailed license information
// governing the source code and code contributions can be found in
// LICENSE.md and CONTRIBUTING.md at the top level directory of deal.II.
//
// ------------------------------------------------------------------------
#include <deal.II/distributed/cell_weights.h>
#include <deal.II/dofs/dof_accessor.h>
#include <limits>
DEAL_II_NAMESPACE_OPEN
namespace parallel
{
template <int dim, int spacedim>
CellWeights<dim, spacedim>::CellWeights(
const DoFHandler<dim, spacedim> &dof_handler,
const WeightingFunction &weighting_function)
{
reinit(dof_handler, weighting_function);
}
template <int dim, int spacedim>
CellWeights<dim, spacedim>::~CellWeights()
{
connection.disconnect();
}
template <int dim, int spacedim>
void
CellWeights<dim, spacedim>::reinit(
const DoFHandler<dim, spacedim> &dof_handler,
const typename CellWeights<dim, spacedim>::WeightingFunction
&weighting_function)
{
connection.disconnect();
connection = dof_handler.get_triangulation().signals.weight.connect(
make_weighting_callback(dof_handler, weighting_function));
}
// ---------- static member functions ----------
// ---------- selection of weighting functions ----------
template <int dim, int spacedim>
typename CellWeights<dim, spacedim>::WeightingFunction
CellWeights<dim, spacedim>::constant_weighting(const unsigned int factor)
{
return [factor](const typename DoFHandler<dim, spacedim>::cell_iterator &,
const FiniteElement<dim, spacedim> &) -> unsigned int {
return factor;
};
}
template <int dim, int spacedim>
typename CellWeights<dim, spacedim>::WeightingFunction
CellWeights<dim, spacedim>::ndofs_weighting(
const std::pair<float, float> &coefficients)
{
return [coefficients](
const typename DoFHandler<dim, spacedim>::cell_iterator &,
const FiniteElement<dim, spacedim> &future_fe) -> unsigned int {
const float result =
std::trunc(coefficients.first *
std::pow(future_fe.n_dofs_per_cell(), coefficients.second));
Assert(result >= 0. &&
result <=
static_cast<float>(std::numeric_limits<unsigned int>::max()),
ExcMessage(
"Cannot cast determined weight for this cell to unsigned int!"));
return static_cast<unsigned int>(result);
};
}
template <int dim, int spacedim>
typename CellWeights<dim, spacedim>::WeightingFunction
CellWeights<dim, spacedim>::ndofs_weighting(
const std::vector<std::pair<float, float>> &coefficients)
{
return [coefficients](
const typename DoFHandler<dim, spacedim>::cell_iterator &,
const FiniteElement<dim, spacedim> &future_fe) -> unsigned int {
float result = 0;
for (const auto &pair : coefficients)
result +=
pair.first * std::pow(future_fe.n_dofs_per_cell(), pair.second);
result = std::trunc(result);
Assert(result >= 0. &&
result <=
static_cast<float>(std::numeric_limits<unsigned int>::max()),
ExcMessage(
"Cannot cast determined weight for this cell to unsigned int!"));
return static_cast<unsigned int>(result);
};
}
// ---------- handling callback functions ----------
template <int dim, int spacedim>
std::function<unsigned int(
const typename dealii::Triangulation<dim, spacedim>::cell_iterator &cell,
const CellStatus status)>
CellWeights<dim, spacedim>::make_weighting_callback(
const DoFHandler<dim, spacedim> &dof_handler,
const typename CellWeights<dim, spacedim>::WeightingFunction
&weighting_function)
{
const parallel::TriangulationBase<dim, spacedim> *tria =
dynamic_cast<const parallel::TriangulationBase<dim, spacedim> *>(
&(dof_handler.get_triangulation()));
Assert(
tria != nullptr,
ExcMessage(
"parallel::CellWeights requires a parallel::TriangulationBase object."));
return [&dof_handler, tria, weighting_function](
const typename dealii::Triangulation<dim, spacedim>::cell_iterator
&cell,
const CellStatus status) -> unsigned int {
return CellWeights<dim, spacedim>::weighting_callback(
cell, status, dof_handler, *tria, weighting_function);
};
}
template <int dim, int spacedim>
unsigned int
CellWeights<dim, spacedim>::weighting_callback(
const typename dealii::Triangulation<dim, spacedim>::cell_iterator &cell_,
const CellStatus status,
const DoFHandler<dim, spacedim> &dof_handler,
const parallel::TriangulationBase<dim, spacedim> &triangulation,
const typename CellWeights<dim, spacedim>::WeightingFunction
&weighting_function)
{
// Check if we are still working with the correct combination of
// Triangulation and DoFHandler.
Assert(&triangulation == &(dof_handler.get_triangulation()),
ExcMessage(
"Triangulation associated with the DoFHandler has changed!"));
// Skip if the DoFHandler has not been initialized yet.
if (dof_handler.get_fe_collection().empty())
return 0;
// Convert cell type from Triangulation to DoFHandler to be able
// to access the information about the degrees of freedom.
const typename DoFHandler<dim, spacedim>::cell_iterator cell(*cell_,
&dof_handler);
// Determine which FiniteElement object will be present on this cell after
// refinement and will thus specify the number of degrees of freedom.
unsigned int fe_index = numbers::invalid_unsigned_int;
switch (status)
{
case CellStatus::cell_will_persist:
case CellStatus::cell_will_be_refined:
case CellStatus::cell_invalid:
fe_index = cell->future_fe_index();
break;
case CellStatus::children_will_be_coarsened:
if constexpr (running_in_debug_mode())
{
for (const auto &child : cell->child_iterators())
Assert(child->is_active() && child->coarsen_flag_set(),
typename dealii::Triangulation<
dim>::ExcInconsistentCoarseningFlags());
}
fe_index = dealii::internal::hp::DoFHandlerImplementation::
dominated_future_fe_on_children<dim, spacedim>(cell);
break;
default:
DEAL_II_ASSERT_UNREACHABLE();
break;
}
// Return the cell weight determined by the function of choice.
return weighting_function(cell, dof_handler.get_fe(fe_index));
}
} // namespace parallel
// explicit instantiations
#include "distributed/cell_weights.inst"
DEAL_II_NAMESPACE_CLOSE
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