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			/**
			* @file field.hh
			*
			* @author Till Junge <till.junge@epfl.ch>
			*
			* @date 07 Sep 2017
			*
			* @brief header-only implementation of a field for field collections
			*
			* Copyright © 2017 Till Junge
			*
			* µSpectre is free software; you can redistribute it and/or
			* modify it under the terms of the GNU Lesser 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 Lesser General Public License
			* along with µSpectre; see the file COPYING. If not, write to the
			* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
			* * Boston, MA 02111-1307, USA.
			*
			* Additional permission under GNU GPL version 3 section 7
			*
			* If you modify this Program, or any covered work, by linking or combining it
			* with proprietary FFT implementations or numerical libraries, containing parts
			* covered by the terms of those libraries' licenses, the licensors of this
			* Program grant you additional permission to convey the resulting work.
			*/

			#ifndef SRC_COMMON_FIELD_HH_
			#define SRC_COMMON_FIELD_HH_

			#include "common/T4_map_proxy.hh"
			#include "common/field_typed.hh"

			#include <Eigen/Dense>

			#include <algorithm>
			#include <cmath>
			#include <sstream>
			#include <string>
			#include <type_traits>
			#include <typeinfo>
			#include <utility>
			#include <vector>

			namespace muSpectre {

			namespace internal {

			/* ---------------------------------------------------------------------- */
			//! declaraton for friending
			template <class FieldCollection, typename T, Dim_t NbComponents,
			bool isConst>
			class FieldMap;

			/* ---------------------------------------------------------------------- */
			/**
			* A `TypedSizedFieldBase` is the base class for fields that contain a
			* statically known number of scalars of a statically known type per pixel
			* in a `FieldCollection`. The actual data for all pixels is
			* stored in `TypedSizeFieldBase::values`.
			* `TypedSizedFieldBase` is the base class for `MatrixField` and
			* `TensorField`.
			*/
			template <class FieldCollection, typename T, Dim_t NbComponents>
			class TypedSizedFieldBase : public TypedField<FieldCollection, T> {
			friend class FieldMap<FieldCollection, T, NbComponents, true>;
			friend class FieldMap<FieldCollection, T, NbComponents, false>;

			public:
			//! for compatibility checks
			constexpr static auto nb_components{NbComponents};
			using Parent = TypedField<FieldCollection, T>; //!< base class
			using Scalar = T; //!< for type checking
			using Base = typename Parent::Base; //!< root base class

			//! storage container
			using Storage_t = typename Parent::Storage_t;

			//! Plain type that is being mapped (Eigen lingo)
			using EigenRep_t = Eigen::Array<T, NbComponents, Eigen::Dynamic>;
			//! maps returned when iterating over field
			using EigenMap_t = Eigen::Map<EigenRep_t>;

			//! maps returned when iterating over field
			using ConstEigenMap_t = Eigen::Map<const EigenRep_t>;

			//! constructor
			TypedSizedFieldBase(std::string unique_name,
			FieldCollection & collection);
			virtual ~TypedSizedFieldBase() = default;

			//! add a new value at the end of the field
			template <class Derived>
			inline void push_back(const Eigen::DenseBase<Derived> & value);

			//! add a new scalar value at the end of the field
			template <bool scalar_store = NbComponents == 1>
			inline std::enable_if_t<scalar_store> push_back(const T & value);

			/**
			* returns an upcasted reference to a field, or throws an
			* exception if the field is incompatible
			*/
			static TypedSizedFieldBase & check_ref(Base & other);
			/**
			* returns an upcasted reference to a field, or throws an
			* exception if the field is incompatible
			*/
			static const TypedSizedFieldBase & check_ref(const Base & other);

			//! return a map representing the entire field as a single `Eigen::Array`
			inline EigenMap_t eigen();
			//! return a map representing the entire field as a single `Eigen::Array`
			inline ConstEigenMap_t eigen() const;
			/**
			* return a map representing the entire field as a single
			* dynamically sized `Eigen::Array` (for python bindings)
			*/
			inline typename Parent::EigenMap_t dyn_eigen() { return Parent::eigen(); }

			//! inner product between compatible fields
			template <typename T2>
			inline Real inner_product(
			const TypedSizedFieldBase<FieldCollection, T2, NbComponents> & other)
			const;

			protected:
			//! returns a raw pointer to the entry, for `Eigen::Map`
			inline T * get_ptr_to_entry(const size_t && index);

			//! returns a raw pointer to the entry, for `Eigen::Map`
			inline const T * get_ptr_to_entry(const size_t && index) const;
			};

			} // namespace internal

			/* ---------------------------------------------------------------------- */
			/**
			* The `TensorField` is a subclass of
			* `muSpectre::internal::TypedSizedFieldBase` that represents tensorial
			* fields, i.e. arbitrary-dimensional arrays with identical number of
			* rows/columns (that typically correspond to the spatial cartesian
			* dimensions). It is defined by the stored scalar type @a T, the tensorial
			* order @a order (often also called degree or rank) and the number of spatial
			* dimensions @a dim.
			*/
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			class TensorField : public internal::TypedSizedFieldBase<FieldCollection, T,
			ipow(dim, order)> {
			public:
			//! base class
			using Parent =
			internal::TypedSizedFieldBase<FieldCollection, T, ipow(dim, order)>;
			using Base = typename Parent::Base; //!< root base class
			//! polymorphic base class
			using Field_p = typename FieldCollection::Field_p;
			using Scalar = typename Parent::Scalar; //!< for type checking
			//! Copy constructor
			TensorField(const TensorField & other) = delete;

			//! Move constructor
			TensorField(TensorField && other) = delete;

			//! Destructor
			virtual ~TensorField() = default;

			//! Copy assignment operator
			TensorField & operator=(const TensorField & other) = delete;

			//! Move assignment operator
			TensorField & operator=(TensorField && other) = delete;

			//! return the order of the stored tensor
			inline Dim_t get_order() const;
			//! return the dimension of the stored tensor
			inline Dim_t get_dim() const;

			//! factory function
			template <class FieldType, class CollectionType, typename... Args>
			friend FieldType & make_field(std::string unique_name,
			CollectionType & collection, Args &&... args);

			//! return a reference or throw an exception if `other` is incompatible
			static TensorField & check_ref(Base & other) {
			return static_cast<TensorField &>(Parent::check_ref(other));
			}
			//! return a reference or throw an exception if `other` is incompatible
			static const TensorField & check_ref(const Base & other) {
			return static_cast<const TensorField &>(Parent::check_ref(other));
			}

			/**
			* Convenience functions to return a map onto this field. A map allows
			* iteration over all pixels. The map's iterator returns an object that
			* represents the underlying mathematical structure of the field and
			* implements common linear algebra operations on it.
			* Specifically, this function returns
			* - A `MatrixFieldMap` with @a dim rows and one column if the tensorial
			* order @a order is unity.
			* - A `MatrixFieldMap` with @a dim rows and @a dim columns if the tensorial
			* order @a order is 2.
			* - A `T4MatrixFieldMap` if the tensorial order is 4.
			*/
			inline decltype(auto) get_map();
			/**
			* Convenience functions to return a map onto this field. A map allows
			* iteration over all pixels. The map's iterator returns an object that
			* represents the underlying mathematical structure of the field and
			* implements common linear algebra operations on it.
			* Specifically, this function returns
			* - A `MatrixFieldMap` with @a dim rows and one column if the tensorial
			* order @a order is unity.
			* - A `MatrixFieldMap` with @a dim rows and @a dim columns if the tensorial
			* order @a order is 2.
			* - A `T4MatrixFieldMap` if the tensorial order is 4.
			*/
			inline decltype(auto) get_const_map();
			/**
			* Convenience functions to return a map onto this field. A map allows
			* iteration over all pixels. The map's iterator returns an object that
			* represents the underlying mathematical structure of the field and
			* implements common linear algebra operations on it.
			* Specifically, this function returns
			* - A `MatrixFieldMap` with @a dim rows and one column if the tensorial
			* order @a order is unity.
			* - A `MatrixFieldMap` with @a dim rows and @a dim columns if the tensorial
			* order @a order is 2.
			* - A `T4MatrixFieldMap` if the tensorial order is 4.
			*/
			inline decltype(auto) get_map() const;

			/**
			* creates a `TensorField` same size and type as this, but all
			* entries are zero. Convenience function
			*/
			inline TensorField & get_zeros_like(std::string unique_name) const;

			protected:
			//! constructor protected!
			TensorField(std::string unique_name, FieldCollection & collection);

			private:
			};

			/* ---------------------------------------------------------------------- */
			/**
			* The `MatrixField` is subclass of `muSpectre::internal::TypedSizedFieldBase`
			* that represents matrix fields, i.e. a two dimensional arrays, defined by
			* the stored scalar type @a T and the number of rows @a NbRow and columns
			* @a NbCol of the matrix.
			*/
			template <class FieldCollection, typename T, Dim_t NbRow, Dim_t NbCol = NbRow>
			class MatrixField : public internal::TypedSizedFieldBase<FieldCollection, T,
			NbRow * NbCol> {
			public:
			//! base class
			using Parent =
			internal::TypedSizedFieldBase<FieldCollection, T, NbRow * NbCol>;
			using Base = typename Parent::Base; //!< root base class
			//! polymorphic base field ptr to store
			using Field_p = std::unique_ptr<internal::FieldBase<FieldCollection>>;
			//! Copy constructor
			MatrixField(const MatrixField & other) = delete;

			//! Move constructor
			MatrixField(MatrixField && other) = delete;

			//! Destructor
			virtual ~MatrixField() = default;

			//! Copy assignment operator
			MatrixField & operator=(const MatrixField & other) = delete;

			//! Move assignment operator
			MatrixField & operator=(MatrixField && other) = delete;

			//! returns the number of rows
			inline Dim_t get_nb_row() const;
			//! returns the number of columns
			inline Dim_t get_nb_col() const;

			//! factory function
			template <class FieldType, class CollectionType, typename... Args>
			friend FieldType & make_field(std::string unique_name,
			CollectionType & collection, Args &&... args);

			//! returns a `MatrixField` reference if `other` is a compatible field
			static MatrixField & check_ref(Base & other) {
			return static_cast<MatrixField &>(Parent::check_ref(other));
			}
			//! returns a `MatrixField` reference if `other` is a compatible field
			static const MatrixField & check_ref(const Base & other) {
			return static_cast<const MatrixField &>(Parent::check_ref(other));
			}

			/**
			* Convenience functions to return a map onto this field. A map allows
			* iteration over all pixels. The map's iterator returns an object that
			* represents the underlying mathematical structure of the field and
			* implements common linear algebra operations on it.
			* Specifically, this function returns
			* - A `ScalarFieldMap` if @a NbRows and @a NbCols are unity.
			* - A `MatrixFieldMap` with @a NbRows rows and @a NbCols columns
			* otherwise.
			*/
			inline decltype(auto) get_map();
			/**
			* Convenience functions to return a map onto this field. A map allows
			* iteration over all pixels. The map's iterator returns an object that
			* represents the underlying mathematical structure of the field and
			* implements common linear algebra operations on it.
			* Specifically, this function returns
			* - A `ScalarFieldMap` if @a NbRows and @a NbCols are unity.
			* - A `MatrixFieldMap` with @a NbRows rows and @a NbCols columns
			* otherwise.
			*/
			inline decltype(auto) get_const_map();
			/**
			* Convenience functions to return a map onto this field. A map allows
			* iteration over all pixels. The map's iterator returns an object that
			* represents the underlying mathematical structure of the field and
			* implements common linear algebra operations on it.
			* Specifically, this function returns
			* - A `ScalarFieldMap` if @a NbRows and @a NbCols are unity.
			* - A `MatrixFieldMap` with @a NbRows rows and @a NbCols columns
			* otherwise.
			*/
			inline decltype(auto) get_map() const;

			/**
			* creates a `MatrixField` same size and type as this, but all
			* entries are zero. Convenience function
			*/
			inline MatrixField & get_zeros_like(std::string unique_name) const;

			protected:
			//! constructor protected!
			MatrixField(std::string unique_name, FieldCollection & collection);

			private:
			};

			/* ---------------------------------------------------------------------- */
			//! convenience alias (
			template <class FieldCollection, typename T>
			using ScalarField = MatrixField<FieldCollection, T, 1, 1>;
			/* ---------------------------------------------------------------------- */
			// Implementations
			/* ---------------------------------------------------------------------- */
			namespace internal {

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			TypedSizedFieldBase<FieldCollection, T, NbComponents>::TypedSizedFieldBase(
			std::string unique_name, FieldCollection & collection)
			: Parent(unique_name, collection, NbComponents) {
			static_assert(
			(std::is_arithmetic<T>::value \|\| std::is_same<T, Complex>::value),
			"Use TypedSizedFieldBase for integer, real or complex scalars for T");
			static_assert(NbComponents > 0,
			"Only fields with more than 0 components");
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			TypedSizedFieldBase<FieldCollection, T, NbComponents> &
			TypedSizedFieldBase<FieldCollection, T, NbComponents>::check_ref(
			Base & other) {
			if (typeid(T).hash_code() != other.get_stored_typeid().hash_code()) {
			std::stringstream err_str{};
			err_str << "Cannot create a reference of type '" << typeid(T).name()
			<< "' for field '" << other.get_name() << "' of type '"
			<< other.get_stored_typeid().name() << "'";
			throw std::runtime_error(err_str.str());
			}
			// check size compatibility
			if (NbComponents != other.get_nb_components()) {
			std::stringstream err_str{};
			err_str << "Cannot create a reference to a field with " << NbComponents
			<< " components "
			<< "for field '" << other.get_name() << "' with "
			<< other.get_nb_components() << " components";
			throw std::runtime_error{err_str.str()};
			}
			return static_cast<TypedSizedFieldBase &>(other);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			const TypedSizedFieldBase<FieldCollection, T, NbComponents> &
			TypedSizedFieldBase<FieldCollection, T, NbComponents>::check_ref(
			const Base & other) {
			if (typeid(T).hash_code() != other.get_stored_typeid().hash_code()) {
			std::stringstream err_str{};
			err_str << "Cannot create a reference of type '" << typeid(T).name()
			<< "' for field '" << other.get_name() << "' of type '"
			<< other.get_stored_typeid().name() << "'";
			throw std::runtime_error(err_str.str());
			}
			// check size compatibility
			if (NbComponents != other.get_nb_components()) {
			std::stringstream err_str{};
			err_str << "Cannot create a reference toy a field with " << NbComponents
			<< " components "
			<< "for field '" << other.get_name() << "' with "
			<< other.get_nb_components() << " components";
			throw std::runtime_error{err_str.str()};
			}
			return static_cast<const TypedSizedFieldBase &>(other);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			auto TypedSizedFieldBase<FieldCollection, T, NbComponents>::eigen()
			-> EigenMap_t {
			return EigenMap_t(this->data(), NbComponents, this->size());
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			auto TypedSizedFieldBase<FieldCollection, T, NbComponents>::eigen() const
			-> ConstEigenMap_t {
			return ConstEigenMap_t(this->data(), NbComponents, this->size());
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			template <typename otherT>
			Real TypedSizedFieldBase<FieldCollection, T, NbComponents>::inner_product(
			const TypedSizedFieldBase<FieldCollection, otherT, NbComponents> &
			other) const {
			return (this->eigen() * other.eigen()).sum();
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			T * TypedSizedFieldBase<FieldCollection, T, NbComponents>::get_ptr_to_entry(
			const size_t && index) {
			return this->data_ptr + NbComponents * std::move(index);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			const T *
			TypedSizedFieldBase<FieldCollection, T, NbComponents>::get_ptr_to_entry(
			const size_t && index) const {
			return this->data_ptr + NbComponents * std::move(index);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			template <class Derived>
			void TypedSizedFieldBase<FieldCollection, T, NbComponents>::push_back(
			const Eigen::DenseBase<Derived> & value) {
			static_assert(Derived::SizeAtCompileTime == NbComponents,
			"You provided an array with the wrong number of entries.");
			static_assert((Derived::RowsAtCompileTime == 1) or
			(Derived::ColsAtCompileTime == 1),
			"You have not provided a column or row vector.");
			static_assert(not FieldCollection::Global,
			"You can only push_back data into local field "
			"collections.");
			for (Dim_t i = 0; i < NbComponents; ++i) {
			this->values.push_back(value(i));
			}
			++this->current_size;
			this->data_ptr = &this->values.front();
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbComponents>
			template <bool scalar_store>
			std::enable_if_t<scalar_store>
			TypedSizedFieldBase<FieldCollection, T, NbComponents>::push_back(
			const T & value) {
			static_assert(scalar_store, "SFINAE");
			this->values.push_back(value);
			++this->current_size;
			this->data_ptr = &this->values.front();
			}

			} // namespace internal

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			TensorField<FieldCollection, T, order, dim>::TensorField(
			std::string unique_name, FieldCollection & collection)
			: Parent(unique_name, collection) {}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			Dim_t TensorField<FieldCollection, T, order, dim>::get_order() const {
			return order;
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			Dim_t TensorField<FieldCollection, T, order, dim>::get_dim() const {
			return dim;
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbRow, Dim_t NbCol>
			MatrixField<FieldCollection, T, NbRow, NbCol>::MatrixField(
			std::string unique_name, FieldCollection & collection)
			: Parent(unique_name, collection) {}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbRow, Dim_t NbCol>
			Dim_t MatrixField<FieldCollection, T, NbRow, NbCol>::get_nb_col() const {
			return NbCol;
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbRow, Dim_t NbCol>
			Dim_t MatrixField<FieldCollection, T, NbRow, NbCol>::get_nb_row() const {
			return NbRow;
			}

			} // namespace muSpectre

			#include "common/field_map.hh"

			namespace muSpectre {

			namespace internal {

			/* ---------------------------------------------------------------------- */
			/**
			* defines the default mapped type obtained when calling
			* `muSpectre::TensorField::get_map()`
			*/
			template <class FieldCollection, typename T, size_t order, Dim_t dim,
			bool ConstMap>
			struct tensor_map_type {};

			/// specialisation for vectors
			template <class FieldCollection, typename T, Dim_t dim, bool ConstMap>
			struct tensor_map_type<FieldCollection, T, firstOrder, dim, ConstMap> {
			//! use this type
			using type = MatrixFieldMap<FieldCollection, T, dim, 1, ConstMap>;
			};

			/// specialisation to second-order tensors (matrices)
			template <class FieldCollection, typename T, Dim_t dim, bool ConstMap>
			struct tensor_map_type<FieldCollection, T, secondOrder, dim, ConstMap> {
			//! use this type
			using type = MatrixFieldMap<FieldCollection, T, dim, dim, ConstMap>;
			};

			/// specialisation to fourth-order tensors
			template <class FieldCollection, typename T, Dim_t dim, bool ConstMap>
			struct tensor_map_type<FieldCollection, T, fourthOrder, dim, ConstMap> {
			//! use this type
			using type = T4MatrixFieldMap<FieldCollection, T, dim, ConstMap>;
			};

			/* ---------------------------------------------------------------------- */
			/**
			* defines the default mapped type obtained when calling
			* `muSpectre::MatrixField::get_map()`
			*/
			template <class FieldCollection, typename T, Dim_t NbRow, Dim_t NbCol,
			bool ConstMap>
			struct matrix_map_type {
			//! mapping type
			using type = MatrixFieldMap<FieldCollection, T, NbRow, NbCol, ConstMap>;
			};

			//! specialisation to scalar fields
			template <class FieldCollection, typename T, bool ConstMap>
			struct matrix_map_type<FieldCollection, T, oneD, oneD, ConstMap> {
			//! mapping type
			using type = ScalarFieldMap<FieldCollection, T, ConstMap>;
			};

			} // namespace internal

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			auto TensorField<FieldCollection, T, order, dim>::get_map()
			-> decltype(auto) {
			constexpr bool map_constness{false};
			using RawMap_t =
			typename internal::tensor_map_type<FieldCollection, T, order, dim,
			map_constness>::type;
			return RawMap_t(*this);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			auto TensorField<FieldCollection, T, order, dim>::get_const_map()
			-> decltype(auto) {
			constexpr bool map_constness{true};
			using RawMap_t =
			typename internal::tensor_map_type<FieldCollection, T, order, dim,
			map_constness>::type;
			return RawMap_t(*this);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			auto TensorField<FieldCollection, T, order, dim>::get_map() const
			-> decltype(auto) {
			constexpr bool map_constness{true};
			using RawMap_t =
			typename internal::tensor_map_type<FieldCollection, T, order, dim,
			map_constness>::type;
			return RawMap_t(*this);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			auto TensorField<FieldCollection, T, order, dim>::get_zeros_like(
			std::string unique_name) const -> TensorField & {
			return make_field<TensorField>(unique_name, this->collection);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbRow, Dim_t NbCol>
			auto MatrixField<FieldCollection, T, NbRow, NbCol>::get_map()
			-> decltype(auto) {
			constexpr bool map_constness{false};
			using RawMap_t =
			typename internal::matrix_map_type<FieldCollection, T, NbRow, NbCol,
			map_constness>::type;
			return RawMap_t(*this);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbRow, Dim_t NbCol>
			auto MatrixField<FieldCollection, T, NbRow, NbCol>::get_const_map()
			-> decltype(auto) {
			constexpr bool map_constness{true};
			using RawMap_t =
			typename internal::matrix_map_type<FieldCollection, T, NbRow, NbCol,
			map_constness>::type;
			return RawMap_t(*this);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t NbRow, Dim_t NbCol>
			auto MatrixField<FieldCollection, T, NbRow, NbCol>::get_map() const
			-> decltype(auto) {
			constexpr bool map_constness{true};
			using RawMap_t =
			typename internal::matrix_map_type<FieldCollection, T, NbRow, NbCol,
			map_constness>::type;
			return RawMap_t(*this);
			}

			/* ---------------------------------------------------------------------- */
			template <class FieldCollection, typename T, Dim_t order, Dim_t dim>
			auto MatrixField<FieldCollection, T, order, dim>::get_zeros_like(
			std::string unique_name) const -> MatrixField & {
			return make_field<MatrixField>(unique_name, this->collection);
			}

			} // namespace muSpectre

			#endif // SRC_COMMON_FIELD_HH_

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