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projection_default.hh
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/**
* @file projection_default.hh
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 14 Jan 2018
*
* @brief virtual base class for default projection implementation, where the
* projection operator is stored as a full fourth-order tensor per
* k-space point (as opposed to 'smart' faster implementations, such as
* ProjectionFiniteStrainFast
*
* Copyright (C) 2018 Till Junge
*
* µSpectre 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, or (at
* your option) any later version.
*
* µSpectre 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 GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef PROJECTION_DEFAULT_H
#define PROJECTION_DEFAULT_H
#include "fft/projection_base.hh"
namespace muSpectre {
/**
* base class to inherit from if one implements a projection
* operator that is stored in form of a fourth-order tensor of real
* values per k-grid point
*/
template <Dim_t DimS, Dim_t DimM>
class ProjectionDefault: public ProjectionBase<DimS, DimM>
{
public:
using Parent = ProjectionBase<DimS, DimM>; //!< base class
using Vector_t = typename Parent::Vector_t; //!< to represent fields
//! polymorphic FFT pointer type
using FFTEngine_ptr = typename Parent::FFTEngine_ptr;
using Ccoord = typename Parent::Ccoord; //!< cell coordinates type
using Rcoord = typename Parent::Rcoord; //!< spatial coordinates type
//! global field collection
using GFieldCollection_t = GlobalFieldCollection<DimS>;
//! local field collection for Fourier-space fields
using LFieldCollection_t = LocalFieldCollection<DimS>;
//! Real space second order tensor fields (to be projected)
using Field_t = TypedField<GFieldCollection_t, Real>;
//! Fourier-space field containing the projection operator itself
using Proj_t = TensorField<LFieldCollection_t, Real, fourthOrder, DimM>;
//! iterable form of the operator
using Proj_map = T4MatrixFieldMap<LFieldCollection_t, Real, DimM>;
//! vectorized version of the Fourier-space second-order tensor field
using Vector_map = MatrixFieldMap<LFieldCollection_t, Complex, DimM*DimM, 1>;
//! Default constructor
ProjectionDefault() = delete;
//! Constructor with cell sizes and formulation
ProjectionDefault(FFTEngine_ptr engine, Rcoord lengths, Formulation form);
//! Copy constructor
ProjectionDefault(const ProjectionDefault &other) = delete;
//! Move constructor
ProjectionDefault(ProjectionDefault &&other) = default;
//! Destructor
virtual ~ProjectionDefault() = default;
//! Copy assignment operator
ProjectionDefault& operator=(const ProjectionDefault &other) = delete;
//! Move assignment operator
ProjectionDefault& operator=(ProjectionDefault &&other) = delete;
//! apply the projection operator to a field
void apply_projection(Field_t & field) override final;
Eigen::Map<Eigen::ArrayXXd> get_operator() override final;
/**
* returns the number of rows and cols for the strain matrix type
* (for full storage, the strain is stored in material_dim ×
* material_dim matrices, but in symmetriy storage, it is a column
* vector)
*/
std::array<Dim_t, 2> get_strain_shape() const override final;
constexpr static Dim_t NbComponents() {return ipow(DimM, 2);}
protected:
Proj_t & Gfield; //!< field holding the operator
Proj_map Ghat; //!< iterable version of operator
private:
};
} // muSpectre
#endif /* PROJECTION_DEFAULT_H */

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