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field_map_tensor.hh
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/**
* file field_map_tensor.hh
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 26 Sep 2017
*
* @brief Defines an Eigen-Tensor map over strongly typed fields
*
* @section LICENCE
*
* Copyright © 2017 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 FIELD_MAP_TENSOR_H
#define FIELD_MAP_TENSOR_H
#include "common/eigen_tools.hh"
#include "common/field_map_base.hh"
#include <sstream>
#include <memory>
namespace muSpectre {
/* ---------------------------------------------------------------------- */
template <class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField=false>
class TensorFieldMap: public
internal::FieldMap<FieldCollection,
T,
SizesByOrder<order, dim>::Sizes::total_size,
ConstField>
{
public:
using Parent = internal::FieldMap<FieldCollection, T,
TensorFieldMap::nb_components, ConstField>;
using Ccoord = Ccoord_t<FieldCollection::spatial_dim()>;
using Sizes = typename SizesByOrder<order, dim>::Sizes;
using T_t = Eigen::TensorFixedSize<T, Sizes>;
using value_type = Eigen::TensorMap<T_t>;
using const_reference = Eigen::TensorMap<const T_t>;
using reference = std::conditional_t<ConstField,
const_reference,
value_type>; // since it's a resource handle
using size_type = typename Parent::size_type;
using pointer = std::unique_ptr<value_type>;
using TypedField = typename Parent::TypedField;
using Field = typename TypedField::Parent;
using const_iterator = typename Parent::template iterator<TensorFieldMap, true>;
using iterator = std::conditional_t<
ConstField,
const_iterator,
typename Parent::template iterator<TensorFieldMap>>;
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
friend iterator;
//! Default constructor
TensorFieldMap() = delete;
template <bool isntConst=!ConstField>
TensorFieldMap(std::enable_if_t<isntConst, Field &> field);
template <bool isConst=ConstField>
TensorFieldMap(std::enable_if_t<isConst, const Field &> field);
//! Copy constructor
TensorFieldMap(const TensorFieldMap &other) = default;
//! Move constructor
TensorFieldMap(TensorFieldMap &&other) noexcept = default;
//! Destructor
virtual ~TensorFieldMap() noexcept = default;
//! Copy assignment operator
TensorFieldMap& operator=(const TensorFieldMap &other) = delete;
//! Assign a matrixlike value to every entry
inline TensorFieldMap & operator=(const T_t & val);
//! Move assignment operator
TensorFieldMap& operator=(TensorFieldMap &&other) noexcept = delete;
//! give human-readable field map type
inline std::string info_string() const override final;
//! member access
inline reference operator[](size_type index);
inline reference operator[](const Ccoord & ccoord);
inline const_reference operator[](size_type index) const;
inline const_reference operator[](const Ccoord& ccoord) const;
//! return an iterator to head of field for ranges
inline iterator begin(){return iterator(*this);}
inline const_iterator cbegin() const {return const_iterator(*this);}
inline const_iterator begin() const {return this->cbegin();}
//! return an iterator to tail of field for ranges
inline iterator end(){return iterator(*this, false);}
inline const_iterator cend() const {return const_iterator(*this, false);}
inline const_iterator end() const {return this->cend();}
inline T_t mean() const;
protected:
//! for sad, legacy iterator use
inline pointer ptr_to_val_t(size_type index);
private:
};
/* ---------------------------------------------------------------------- */
template<class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
template <bool isntConst>
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
TensorFieldMap(std::enable_if_t<isntConst, Field &> field)
:Parent(field) {
static_assert((isntConst != ConstField),
"let the compiler deduce isntConst, this is a SFINAE "
"parameter");
this->check_compatibility();
}
/* ---------------------------------------------------------------------- */
template<class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
template <bool isConst>
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
TensorFieldMap(std::enable_if_t<isConst, const Field &> field)
:Parent(field) {
static_assert((isConst == ConstField),
"let the compiler deduce isntConst, this is a SFINAE "
"parameter");
this->check_compatibility();
}
/* ---------------------------------------------------------------------- */
//! human-readable field map type
template<class FieldCollection, typename T, Dim_t order, Dim_t dim, bool ConstField>
std::string
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::info_string() const {
std::stringstream info;
info << "Tensor(" << typeid(T).name() << ", " << order
<< "_o, " << dim << "_d)";
return info.str();
}
/* ---------------------------------------------------------------------- */
//! member access
template <class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
typename TensorFieldMap<FieldCollection, T, order, dim, ConstField>::reference
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
operator[](size_type index) {
auto && lambda = [this, &index](auto&&...tens_sizes) {
return reference(this->get_ptr_to_entry(index), tens_sizes...);
};
return call_sizes<order, dim>(lambda);
}
template<class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
typename TensorFieldMap<FieldCollection, T, order, dim, ConstField>::reference
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
operator[](const Ccoord & ccoord) {
auto && index = this->collection.get_index(ccoord);
auto && lambda = [this, &index](auto&&...sizes) {
return reference(this->get_ptr_to_entry(index), sizes...);
};
return call_sizes<order, dim>(lambda);
}
template <class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
typename TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
const_reference
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
operator[](size_type index) const {
// Warning: due to a inconsistency in Eigen's API, tensor maps
// cannot be constructed from a const ptr, hence this nasty const
// cast :(
auto && lambda = [this, &index](auto&&...tens_sizes) {
return const_reference(const_cast<T*>(this->get_ptr_to_entry(index)),
tens_sizes...);
};
return call_sizes<order, dim>(lambda);
}
template<class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
typename TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
const_reference
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
operator[](const Ccoord & ccoord) const {
auto && index = this->collection.get_index(ccoord);
auto && lambda = [this, &index](auto&&...sizes) {
return const_reference(const_cast<T*>(this->get_ptr_to_entry(index)),
sizes...);
};
return call_sizes<order, dim>(lambda);
}
/* ---------------------------------------------------------------------- */
template<class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
TensorFieldMap<FieldCollection, T, order, dim, ConstField> &
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
operator=(const T_t & val) {
for (auto && tens: *this) {
tens = val;
}
return *this;
}
/* ---------------------------------------------------------------------- */
template <class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
typename TensorFieldMap<FieldCollection, T, order, dim, ConstField>::T_t
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
mean() const {
T_t mean{T_t::Zero()};
for (auto && val: *this) {
mean += val;
}
mean *= 1./Real(this->size());
return mean;
}
/* ---------------------------------------------------------------------- */
//! for sad, legacy iterator use. Don't use unless you have to.
template<class FieldCollection, typename T, Dim_t order, Dim_t dim,
bool ConstField>
typename TensorFieldMap<FieldCollection, T, order, dim, ConstField>::pointer
TensorFieldMap<FieldCollection, T, order, dim, ConstField>::
ptr_to_val_t(size_type index) {
auto && lambda = [this, &index](auto&&... tens_sizes) {
return std::make_unique<value_type>(this->get_ptr_to_entry(index),
tens_sizes...);
};
return call_sizes<order, dim>(lambda);
}
} // muSpectre
#endif /* FIELD_MAP_TENSOR_H */

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