field.hh
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field.hh
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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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