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// ------------------------------------------------------------------------
//
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 1999 - 2023 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.
//
// ------------------------------------------------------------------------
#ifndef dealii_tensor_function_templates_h
#define dealii_tensor_function_templates_h
#include <deal.II/base/config.h>
#include <deal.II/base/tensor.h>
#include <deal.II/base/tensor_function.h>
#include <deal.II/lac/vector.h>
#include <cmath>
#include <vector>
DEAL_II_NAMESPACE_OPEN
template <int rank, int dim, typename Number>
TensorFunction<rank, dim, Number>::TensorFunction(
const typename TensorFunction<rank, dim, Number>::time_type initial_time)
: FunctionTime<typename TensorFunction<rank, dim, Number>::time_type>(
initial_time)
{}
template <int rank, int dim, typename Number>
typename TensorFunction<rank, dim, Number>::value_type
TensorFunction<rank, dim, Number>::value(const Point<dim> &) const
{
Assert(false, ExcPureFunctionCalled());
return Tensor<rank, dim, Number>();
}
template <int rank, int dim, typename Number>
void
TensorFunction<rank, dim, Number>::value_list(
const std::vector<Point<dim>> &points,
std::vector<value_type> &values) const
{
Assert(values.size() == points.size(),
ExcDimensionMismatch(values.size(), points.size()));
for (unsigned int i = 0; i < points.size(); ++i)
values[i] = this->value(points[i]);
}
template <int rank, int dim, typename Number>
typename TensorFunction<rank, dim, Number>::gradient_type
TensorFunction<rank, dim, Number>::gradient(const Point<dim> &) const
{
Assert(false, ExcPureFunctionCalled());
return Tensor<rank + 1, dim, Number>();
}
template <int rank, int dim, typename Number>
void
TensorFunction<rank, dim, Number>::gradient_list(
const std::vector<Point<dim>> &points,
std::vector<gradient_type> &gradients) const
{
Assert(gradients.size() == points.size(),
ExcDimensionMismatch(gradients.size(), points.size()));
for (unsigned int i = 0; i < points.size(); ++i)
gradients[i] = gradient(points[i]);
}
template <int rank, int dim, typename Number>
ConstantTensorFunction<rank, dim, Number>::ConstantTensorFunction(
const Tensor<rank, dim, Number> &value,
const typename ConstantTensorFunction<rank, dim, Number>::time_type
initial_time)
: TensorFunction<rank, dim, Number>(initial_time)
, _value(value)
{}
template <int rank, int dim, typename Number>
typename TensorFunction<rank, dim, Number>::value_type
ConstantTensorFunction<rank, dim, Number>::value(
const Point<dim> & /*point*/) const
{
return _value;
}
template <int rank, int dim, typename Number>
void
ConstantTensorFunction<rank, dim, Number>::value_list(
const std::vector<Point<dim>> &points,
std::vector<typename TensorFunction<rank, dim, Number>::value_type> &values)
const
{
(void)points;
Assert(values.size() == points.size(),
ExcDimensionMismatch(values.size(), points.size()));
for (unsigned int i = 0; i < values.size(); ++i)
values[i] = _value;
}
template <int rank, int dim, typename Number>
typename TensorFunction<rank, dim, Number>::gradient_type
ConstantTensorFunction<rank, dim, Number>::gradient(const Point<dim> &) const
{
// Return a zero (=default initialized) tensor
return {};
}
template <int rank, int dim, typename Number>
void
ConstantTensorFunction<rank, dim, Number>::gradient_list(
const std::vector<Point<dim>> &points,
std::vector<typename TensorFunction<rank, dim, Number>::gradient_type>
&gradients) const
{
(void)points;
Assert(gradients.size() == points.size(),
ExcDimensionMismatch(gradients.size(), points.size()));
// Return an array of zero tensors.
std::fill(gradients.begin(),
gradients.end(),
typename TensorFunction<rank, dim, Number>::gradient_type());
}
template <int rank, int dim, typename Number>
ZeroTensorFunction<rank, dim, Number>::ZeroTensorFunction(
const typename ZeroTensorFunction<rank, dim, Number>::time_type initial_time)
: ConstantTensorFunction<rank, dim, Number>(
dealii::Tensor<rank, dim, Number>(),
initial_time)
{}
DEAL_II_NAMESPACE_CLOSE
#endif /* dealii_tensor_function_templates_h */
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