aka_array_tmpl.hh
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aka_array_tmpl.hh
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	/**
	* @file aka_array_tmpl.hh
	*
	* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
	* @author Nicolas Richart <nicolas.richart@epfl.ch>
	*
	* @date creation: Thu Jul 15 2010
	* @date last modification: Tue Feb 20 2018
	*
	* @brief Inline functions of the classes Array<T> and ArrayBase
	*
	* @section LICENSE
	*
	* Copyright (©) 2010-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
	* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
	*
	* Akantu 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 of the License, or (at your option) any
	* later version.
	*
	* Akantu 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 Lesser General Public License for more
	* details.
	*
	* You should have received a copy of the GNU Lesser General Public License
	* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	/* -------------------------------------------------------------------------- */
	/* Inline Functions Array<T> */
	/* -------------------------------------------------------------------------- */
	#include "aka_array.hh"
	/* -------------------------------------------------------------------------- */
	#include <memory>
	/* -------------------------------------------------------------------------- */

	#ifndef __AKANTU_AKA_ARRAY_TMPL_HH__
	#define __AKANTU_AKA_ARRAY_TMPL_HH__

	namespace akantu {

	namespace debug {
	struct ArrayException : public Exception {};
	} // namespace debug

	/* -------------------------------------------------------------------------- */
	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	ArrayDataLayer<T, allocation_trait>::ArrayDataLayer(UInt size,
	UInt nb_component,
	const ID & id)
	: ArrayBase(id) {
	allocate(size, nb_component);
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	ArrayDataLayer<T, allocation_trait>::ArrayDataLayer(UInt size,
	UInt nb_component,
	const_reference value,
	const ID & id)
	: ArrayBase(id) {
	allocate(size, nb_component, value);
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	ArrayDataLayer<T, allocation_trait>::ArrayDataLayer(const ArrayDataLayer & vect,
	const ID & id)
	: ArrayBase(vect, id) {
	this->data_storage = vect.data_storage;
	this->size_ = vect.size_;
	this->nb_component = vect.nb_component;
	this->values = this->data_storage.data();
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	ArrayDataLayer<T, allocation_trait>::ArrayDataLayer(
	const std::vector<value_type> & vect) {
	this->data_storage = vect;
	this->size_ = vect.size();
	this->nb_component = 1;
	this->values = this->data_storage.data();
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	ArrayDataLayer<T, allocation_trait> & ArrayDataLayer<T, allocation_trait>::
	operator=(const ArrayDataLayer & other) {
	if (this != &other) {
	this->data_storage = other.data_storage;
	this->nb_component = other.nb_component;
	this->size_ = other.size_;
	this->values = this->data_storage.data();
	}
	return *this;
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	ArrayDataLayer<T, allocation_trait>::ArrayDataLayer(ArrayDataLayer && other) =
	default;

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	ArrayDataLayer<T, allocation_trait> & ArrayDataLayer<T, allocation_trait>::
	operator=(ArrayDataLayer && other) = default;

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	void ArrayDataLayer<T, allocation_trait>::allocate(UInt new_size,
	UInt nb_component) {
	this->nb_component = nb_component;
	this->resize(new_size);
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	void ArrayDataLayer<T, allocation_trait>::allocate(UInt new_size,
	UInt nb_component,
	const T & val) {
	this->nb_component = nb_component;
	this->resize(new_size, val);
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	void ArrayDataLayer<T, allocation_trait>::resize(UInt new_size) {
	this->data_storage.resize(new_size * this->nb_component);
	this->values = this->data_storage.data();
	this->size_ = new_size;
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	void ArrayDataLayer<T, allocation_trait>::resize(UInt new_size,
	const T & value) {
	this->data_storage.resize(new_size * this->nb_component, value);
	this->values = this->data_storage.data();
	this->size_ = new_size;
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	void ArrayDataLayer<T, allocation_trait>::reserve(UInt size, UInt new_size) {
	if (new_size != UInt(-1)) {
	this->data_storage.resize(new_size * this->nb_component);
	}

	this->data_storage.reserve(size * this->nb_component);
	this->values = this->data_storage.data();
	}

	/* -------------------------------------------------------------------------- */
	/**
	* append a tuple to the array with the value value for all components
	* @param value the new last tuple or the array will contain nb_component copies
	* of value
	*/
	template <typename T, ArrayAllocationType allocation_trait>
	inline void ArrayDataLayer<T, allocation_trait>::push_back(const T & value) {
	this->data_storage.push_back(value);
	this->values = this->data_storage.data();
	this->size_ += 1;
	}

	/* -------------------------------------------------------------------------- */
	/**
	* append a matrix or a vector to the array
	* @param new_elem a reference to a Matrix<T> or Vector<T> */
	template <typename T, ArrayAllocationType allocation_trait>
	template <template <typename> class C, typename>
	inline void
	ArrayDataLayer<T, allocation_trait>::push_back(const C<T> & new_elem) {
	AKANTU_DEBUG_ASSERT(
	nb_component == new_elem.size(),
	"The vector("
	<< new_elem.size()
	<< ") as not a size compatible with the Array (nb_component="
	<< nb_component << ").");
	for (UInt i = 0; i < new_elem.size(); ++i) {
	this->data_storage.push_back(new_elem[i]);
	}
	this->values = this->data_storage.data();
	this->size_ += 1;
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	inline UInt ArrayDataLayer<T, allocation_trait>::getAllocatedSize() const {
	return this->data_storage.capacity() / this->nb_component;
	}

	/* -------------------------------------------------------------------------- */
	template <typename T, ArrayAllocationType allocation_trait>
	inline UInt ArrayDataLayer<T, allocation_trait>::getMemorySize() const {
	return this->data_storage.capacity() * sizeof(T);
	}

	/* -------------------------------------------------------------------------- */

	/* -------------------------------------------------------------------------- */
	template <typename T>
	class ArrayDataLayer<T, ArrayAllocationType::_pod> : public ArrayBase {
	public:
	using value_type = T;
	using reference = value_type &;
	using pointer_type = value_type *;
	using const_reference = const value_type &;

	public:
	virtual ~ArrayDataLayer() { deallocate(); }

	/// Allocation of a new vector
	ArrayDataLayer(UInt size = 0, UInt nb_component = 1, const ID & id = "")
	: ArrayBase(id) {
	allocate(size, nb_component);
	}

	/// Allocation of a new vector with a default value
	ArrayDataLayer(UInt size, UInt nb_component, const_reference value,
	const ID & id = "")
	: ArrayBase(id) {
	allocate(size, nb_component, value);
	}

	/// Copy constructor (deep copy)
	ArrayDataLayer(const ArrayDataLayer & vect, const ID & id = "")
	: ArrayBase(vect, id) {
	allocate(vect.size(), vect.getNbComponent());
	std::copy_n(vect.storage(), this->size_ * this->nb_component, values);
	}

	/// Copy constructor (deep copy)
	explicit ArrayDataLayer(const std::vector<value_type> & vect) {
	allocate(vect.size(), 1);
	std::copy_n(vect.data(), this->size_ * this->nb_component, values);
	}

	// copy operator
	inline ArrayDataLayer & operator=(const ArrayDataLayer & other) {
	if (this != &other) {
	allocate(other.size(), other.getNbComponent());
	std::copy_n(other.storage(), this->size_ * this->nb_component, values);
	}
	return *this;
	}

	// move constructor
	inline ArrayDataLayer(ArrayDataLayer && other) = default;

	// move assign
	inline ArrayDataLayer & operator=(ArrayDataLayer && other) = default;

	protected:
	// deallocate the memory
	virtual void deallocate() { free(this->values); }

	// allocate the memory
	virtual inline void allocate(UInt size, UInt nb_component) {
	if (size != 0) { // malloc can return a non NULL pointer in case size is 0
	this->values =
	static_cast<T >(std::malloc(nb_component size * sizeof(T)));
	}

	if (this->values == nullptr and size != 0) {
	throw std::bad_alloc();
	}
	this->nb_component = nb_component;
	this->allocated_size = this->size_ = size;
	}

	// allocate and initialize the memory
	virtual inline void allocate(UInt size, UInt nb_component, const T & value) {
	allocate(size, nb_component);
	std::fill_n(values, size * nb_component, value);
	}

	public:
	/// append a tuple of size nb_component containing value
	inline void push_back(const_reference value) {
	resize(this->size_ + 1, value);
	}

	/// append a Vector or a Matrix
	template <template <typename> class C,
	typename = std::enable_if_t<aka::is_tensor<C<T>>::value or
	aka::is_tensor_proxy<C<T>>::value>>
	inline void push_back(const C<T> & new_elem) {
	AKANTU_DEBUG_ASSERT(
	nb_component == new_elem.size(),
	"The vector("
	<< new_elem.size()
	<< ") as not a size compatible with the Array (nb_component="
	<< nb_component << ").");
	this->resize(this->size_ + 1);
	std::copy_n(new_elem.storage(), new_elem.size(),
	values + this->nb_component * (this->size_ - 1));
	}

	/// changes the allocated size but not the size
	virtual void reserve(UInt size, UInt new_size = UInt(-1)) {
	UInt tmp_size = this->size_;
	if (new_size != UInt(-1))
	tmp_size = new_size;
	this->resize(size);
	this->size_ = std::min(this->size_, tmp_size);
	}

	/// change the size of the Array
	virtual void resize(UInt size) {
	if (size * this->nb_component == 0) {
	free(values);
	values = nullptr;
	this->allocated_size = 0;
	} else {
	if (this->values == nullptr) {
	this->allocate(size, this->nb_component);
	return;
	}

	Int diff = size - allocated_size;
	UInt size_to_allocate = (std::abs(diff) > AKANTU_MIN_ALLOCATION)
	? size
	: (diff > 0)
	? allocated_size + AKANTU_MIN_ALLOCATION
	: allocated_size;

	auto * tmp_ptr = reinterpret_cast<T *>(realloc(
	this->values, size_to_allocate * this->nb_component * sizeof(T)));
	if (tmp_ptr == nullptr) {
	throw std::bad_alloc();
	}

	this->values = tmp_ptr;
	this->allocated_size = size_to_allocate;
	}

	this->size_ = size;
	}

	/// change the size of the Array and initialize the values
	virtual void resize(UInt size, const T & val) {
	UInt tmp_size = this->size_;
	this->resize(size);
	if (size > tmp_size) {
	std::fill_n(values + this->nb_component * tmp_size,
	(size - tmp_size) * this->nb_component, val);
	}
	}

	/// get the amount of space allocated in bytes
	inline UInt getMemorySize() const override final {
	return this->allocated_size * this->nb_component * sizeof(T);
	}

	/// Get the real size allocated in memory
	inline UInt getAllocatedSize() const { return this->allocated_size; }

	/// give the address of the memory allocated for this vector
	T * storage() const { return values; };

	protected:
	/// allocation type agnostic data access
	T * values{nullptr};

	UInt allocated_size{0};
	};
	/* -------------------------------------------------------------------------- */

	/* -------------------------------------------------------------------------- */
	/* template <class T> class AllocatorMalloc : public Allocator<T> {
	public:
	T * allocate(UInt size, UInt nb_component) override final {
	auto * ptr = reinterpret_cast<T >(malloc(nb_component size * sizeof(T)));

	if (ptr == nullptr and size != 0) {
	throw std::bad_alloc();
	}
	return ptr;
	}

	void deallocate(T * ptr, UInt size, UInt ,
	UInt nb_component) override final {
	if (ptr) {
	if (not is_scalar<T>::value) {
	for (UInt i = 0; i < size * nb_component; ++i) {
	(ptr + i)->~T();
	}
	}
	free(ptr);
	}
	}

	std::tuple<T *, UInt> resize(UInt new_size, UInt size, UInt allocated_size,
	UInt nb_component, T * ptr) override final {
	UInt size_to_alloc = 0;

	if (not is_scalar<T>::value and (new_size < size)) {
	for (UInt i = new_size * nb_component; i < size * nb_component; ++i) {
	(ptr + i)->~T();
	}
	}

	// free some memory
	if (new_size == 0) {
	free(ptr);
	return std::make_tuple(nullptr, 0);
	}

	if (new_size <= allocated_size) {
	if (allocated_size - new_size > AKANTU_MIN_ALLOCATION) {
	size_to_alloc = new_size;
	} else {
	return std::make_tuple(ptr, allocated_size);
	}
	} else {
	// allocate more memory
	size_to_alloc = (new_size - allocated_size < AKANTU_MIN_ALLOCATION)
	? allocated_size + AKANTU_MIN_ALLOCATION
	: new_size;
	}

	auto * tmp_ptr = reinterpret_cast<T *>(
	realloc(ptr, size_to_alloc * nb_component * sizeof(T)));
	if (tmp_ptr == nullptr) {
	throw std::bad_alloc();
	}

	return std::make_tuple(tmp_ptr, size_to_alloc);
	}
	};
	*/

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	inline auto Array<T, is_scal>::operator()(UInt i, UInt j) -> reference {
	AKANTU_DEBUG_ASSERT(this->size_ > 0,
	"The array \"" << this->id << "\" is empty");
	AKANTU_DEBUG_ASSERT((i < this->size_) && (j < this->nb_component),
	"The value at position ["
	<< i << "," << j << "] is out of range in array \""
	<< this->id << "\"");
	return this->values[i * this->nb_component + j];
	}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	inline auto Array<T, is_scal>::operator()(UInt i, UInt j) const
	-> const_reference {
	AKANTU_DEBUG_ASSERT(this->size_ > 0,
	"The array \"" << this->id << "\" is empty");
	AKANTU_DEBUG_ASSERT((i < this->size_) && (j < this->nb_component),
	"The value at position ["
	<< i << "," << j << "] is out of range in array \""
	<< this->id << "\"");
	return this->values[i * this->nb_component + j];
	}

	template <class T, bool is_scal>
	inline auto Array<T, is_scal>::operator[](UInt i) -> reference {
	AKANTU_DEBUG_ASSERT(this->size_ > 0,
	"The array \"" << this->id << "\" is empty");
	AKANTU_DEBUG_ASSERT((i < this->size_ * this->nb_component),
	"The value at position ["
	<< i << "] is out of range in array \"" << this->id
	<< "\"");
	return this->values[i];
	}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	inline auto Array<T, is_scal>::operator[](UInt i) const -> const_reference {
	AKANTU_DEBUG_ASSERT(this->size_ > 0,
	"The array \"" << this->id << "\" is empty");
	AKANTU_DEBUG_ASSERT((i < this->size_ * this->nb_component),
	"The value at position ["
	<< i << "] is out of range in array \"" << this->id
	<< "\"");
	return this->values[i];
	}

	/* -------------------------------------------------------------------------- */
	/**
	* erase an element. If the erased element is not the last of the array, the
	* last element is moved into the hole in order to maintain contiguity. This
	* may invalidate existing iterators (For instance an iterator obtained by
	* Array::end() is no longer correct) and will change the order of the
	* elements.
	* @param i index of element to erase
	*/
	template <class T, bool is_scal> inline void Array<T, is_scal>::erase(UInt i) {
	AKANTU_DEBUG_IN();
	AKANTU_DEBUG_ASSERT((this->size_ > 0), "The array is empty");
	AKANTU_DEBUG_ASSERT((i < this->size_), "The element at position ["
	<< i << "] is out of range (" << i
	<< ">=" << this->size_ << ")");

	if (i != (this->size_ - 1)) {
	for (UInt j = 0; j < this->nb_component; ++j) {
	this->values[i * this->nb_component + j] =
	this->values[(this->size_ - 1) * this->nb_component + j];
	}
	}

	this->resize(this->size_ - 1);
	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	/**
	* Subtract another array entry by entry from this array in place. Both arrays
	* must
	* have the same size and nb_component. If the arrays have different shapes,
	* code compiled in debug mode will throw an expeption and optimised code
	* will behave in an unpredicted manner
	* @param other array to subtract from this
	* @return reference to modified this
	*/
	template <class T, bool is_scal>
	Array<T, is_scal> & Array<T, is_scal>::
	operator-=(const Array<T, is_scal> & vect) {
	AKANTU_DEBUG_ASSERT((this->size_ == vect.size_) &&
	(this->nb_component == vect.nb_component),
	"The too array don't have the same sizes");

	T * a = this->values;
	T * b = vect.storage();
	for (UInt i = 0; i < this->size_ * this->nb_component; ++i) {
	a -= b;
	++a;
	++b;
	}

	return *this;
	}

	/* -------------------------------------------------------------------------- */
	/**
	* Add another array entry by entry to this array in place. Both arrays must
	* have the same size and nb_component. If the arrays have different shapes,
	* code compiled in debug mode will throw an expeption and optimised code
	* will behave in an unpredicted manner
	* @param other array to add to this
	* @return reference to modified this
	*/
	template <class T, bool is_scal>
	Array<T, is_scal> & Array<T, is_scal>::
	operator+=(const Array<T, is_scal> & vect) {
	AKANTU_DEBUG_ASSERT((this->size_ == vect.size()) &&
	(this->nb_component == vect.nb_component),
	"The too array don't have the same sizes");

	T * a = this->values;
	T * b = vect.storage();
	for (UInt i = 0; i < this->size_ * this->nb_component; ++i) {
	a++ += b++;
	}

	return *this;
	}

	/* -------------------------------------------------------------------------- */
	/**
	* Multiply all entries of this array by a scalar in place
	* @param alpha scalar multiplicant
	* @return reference to modified this
	*/

	template <class T, bool is_scal>
	Array<T, is_scal> & Array<T, is_scal>::operator*=(const T & alpha) {
	T * a = this->values;
	for (UInt i = 0; i < this->size_ * this->nb_component; ++i) {
	a++ = alpha;
	}

	return *this;
	}

	/* -------------------------------------------------------------------------- */
	/**
	* Compare this array element by element to another.
	* @param other array to compare to
	* @return true it all element are equal and arrays have the same shape, else
	* false
	*/
	template <class T, bool is_scal>
	bool Array<T, is_scal>::operator==(const Array<T, is_scal> & array) const {
	bool equal = this->nb_component == array.nb_component &&
	this->size_ == array.size_ && this->id == array.id;
	if (!equal)
	return false;

	if (this->values == array.storage())
	return true;
	else
	return std::equal(this->values,
	this->values + this->size_ * this->nb_component,
	array.storage());
	}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	bool Array<T, is_scal>::operator!=(const Array<T, is_scal> & array) const {
	return !operator==(array);
	}

	/* -------------------------------------------------------------------------- */
	/**
	* set all tuples of the array to a given vector or matrix
	* @param vm Matrix or Vector to fill the array with
	*/
	template <class T, bool is_scal>
	template <template <typename> class C, typename>
	inline void Array<T, is_scal>::set(const C<T> & vm) {
	AKANTU_DEBUG_ASSERT(
	this->nb_component == vm.size(),
	"The size of the object does not match the number of components");
	for (T * it = this->values;
	it < this->values + this->nb_component * this->size_;
	it += this->nb_component) {
	std::copy_n(vm.storage(), this->nb_component, it);
	}
	}
	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	void Array<T, is_scal>::append(const Array<T> & other) {
	AKANTU_DEBUG_ASSERT(
	this->nb_component == other.nb_component,
	"Cannot append an array with a different number of component");
	UInt old_size = this->size_;
	this->resize(this->size_ + other.size());

	T * tmp = this->values + this->nb_component * old_size;
	std::copy_n(other.storage(), other.size() * this->nb_component, tmp);
	}

	/* -------------------------------------------------------------------------- */
	/* Functions Array<T, is_scal> */
	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	Array<T, is_scal>::Array(UInt size, UInt nb_component, const ID & id)
	: parent(size, nb_component, id) {}

	template <>
	inline Array<std::string, false>::Array(UInt size, UInt nb_component,
	const ID & id)
	: parent(size, nb_component, "", id) {}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	Array<T, is_scal>::Array(UInt size, UInt nb_component, const_reference value,
	const ID & id)
	: parent(size, nb_component, value, id) {}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	Array<T, is_scal>::Array(const Array & vect, const ID & id)
	: parent(vect, id) {}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	Array<T, is_scal> & Array<T, is_scal>::
	operator=(const Array<T, is_scal> & other) {
	AKANTU_DEBUG_WARNING("You are copying the array "
	<< this->id << " are you sure it is on purpose");

	if (&other == this)
	return *this;

	parent::operator=(other);

	return *this;
	}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	Array<T, is_scal>::Array(const std::vector<T> & vect) : parent(vect) {}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal> Array<T, is_scal>::~Array() = default;

	/* -------------------------------------------------------------------------- */
	/**
	* search elem in the array, return the position of the first occurrence or
	* -1 if not found
	* @param elem the element to look for
	* @return index of the first occurrence of elem or -1 if elem is not present
	*/
	template <class T, bool is_scal>
	UInt Array<T, is_scal>::find(const_reference elem) const {
	AKANTU_DEBUG_IN();

	auto begin = this->begin();
	auto end = this->end();
	auto it = std::find(begin, end, elem);

	AKANTU_DEBUG_OUT();
	return (it != end) ? it - begin : UInt(-1);
	}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal> UInt Array<T, is_scal>::find(T elem[]) const {
	AKANTU_DEBUG_IN();
	T * it = this->values;
	UInt i = 0;
	for (; i < this->size_; ++i) {
	if (*it == elem[0]) {
	T * cit = it;
	UInt c = 0;
	for (; (c < this->nb_component) && (*cit == elem[c]); ++c, ++cit)
	;
	if (c == this->nb_component) {
	AKANTU_DEBUG_OUT();
	return i;
	}
	}
	it += this->nb_component;
	}
	return UInt(-1);
	}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	template <template <typename> class C, typename>
	inline UInt Array<T, is_scal>::find(const C<T> & elem) {
	AKANTU_DEBUG_ASSERT(elem.size() == this->nb_component,
	"Cannot find an element with a wrong size ("
	<< elem.size() << ") != " << this->nb_component);
	return this->find(elem.storage());
	}

	/* -------------------------------------------------------------------------- */
	/**
	* copy the content of another array. This overwrites the current content.
	* @param other Array to copy into this array. It has to have the same
	* nb_component as this. If compiled in debug mode, an incorrect other will
	* result in an exception being thrown. Optimised code may result in
	* unpredicted behaviour.
	*/
	template <class T, bool is_scal>
	void Array<T, is_scal>::copy(const Array<T, is_scal> & vect,
	bool no_sanity_check) {
	AKANTU_DEBUG_IN();

	if (!no_sanity_check)
	if (vect.nb_component != this->nb_component)
	AKANTU_ERROR("The two arrays do not have the same number of components");

	this->resize((vect.size_ * vect.nb_component) / this->nb_component);

	std::copy_n(vect.storage(), this->size_ * this->nb_component, this->values);

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	template <bool is_scal> class ArrayPrintHelper {
	public:
	template <typename T>
	static void print_content(const Array<T> & vect, std::ostream & stream,
	int indent) {
	std::string space(indent, AKANTU_INDENT);

	stream << space << " + values : {";
	for (UInt i = 0; i < vect.size(); ++i) {
	stream << "{";
	for (UInt j = 0; j < vect.getNbComponent(); ++j) {
	stream << vect(i, j);
	if (j != vect.getNbComponent() - 1)
	stream << ", ";
	}
	stream << "}";
	if (i != vect.size() - 1)
	stream << ", ";
	}
	stream << "}" << std::endl;
	}
	};

	template <> class ArrayPrintHelper<false> {
	public:
	template <typename T>
	static void print_content(__attribute__((unused)) const Array<T> & vect,
	__attribute__((unused)) std::ostream & stream,
	__attribute__((unused)) int indent) {}
	};

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	void Array<T, is_scal>::printself(std::ostream & stream, int indent) const {
	std::string space(indent, AKANTU_INDENT);

	std::streamsize prec = stream.precision();
	std::ios_base::fmtflags ff = stream.flags();

	stream.setf(std::ios_base::showbase);
	stream.precision(2);

	stream << space << "Array<" << debug::demangle(typeid(T).name()) << "> ["
	<< std::endl;
	stream << space << " + id : " << this->id << std::endl;
	stream << space << " + size : " << this->size_ << std::endl;
	stream << space << " + nb_component : " << this->nb_component << std::endl;
	stream << space << " + allocated size : " << this->getAllocatedSize()
	<< std::endl;
	stream << space
	<< " + memory size : " << printMemorySize<T>(this->getMemorySize())
	<< std::endl;
	if (!AKANTU_DEBUG_LEVEL_IS_TEST())
	stream << space << " + address : " << std::hex << this->values
	<< std::dec << std::endl;

	stream.precision(prec);
	stream.flags(ff);

	if (AKANTU_DEBUG_TEST(dblDump) \|\| AKANTU_DEBUG_LEVEL_IS_TEST()) {
	ArrayPrintHelper<is_scal or std::is_enum<T>::value>::print_content(
	*this, stream, indent);
	}

	stream << space << "]" << std::endl;
	}

	/* -------------------------------------------------------------------------- */
	/* Inline Functions ArrayBase */
	/* -------------------------------------------------------------------------- */

	inline void ArrayBase::empty() { this->size_ = 0; }

	/* -------------------------------------------------------------------------- */
	/* Iterators */
	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	template <class R, class daughter, class IR, bool is_tensor>
	class Array<T, is_scal>::iterator_internal {
	public:
	using value_type = R;
	using pointer = R *;
	using reference = R &;
	using const_reference = const R &;
	using internal_value_type = IR;
	using internal_pointer = IR *;
	using difference_type = std::ptrdiff_t;
	using iterator_category = std::random_access_iterator_tag;
	static_assert(not is_tensor, "Cannot handle tensors");

	public:
	iterator_internal(pointer data = nullptr) : ret(data), initial(data){};
	iterator_internal(const iterator_internal & it) = default;
	iterator_internal(iterator_internal && it) = default;

	virtual ~iterator_internal() = default;

	inline iterator_internal & operator=(const iterator_internal & it) = default;

	UInt getCurrentIndex() { return (this->ret - this->initial); };

	inline reference operator() { return ret; };
	inline const_reference operator() const { return ret; };
	inline pointer operator->() { return ret; };
	inline daughter & operator++() {
	++ret;
	return static_cast<daughter &>(*this);
	};
	inline daughter & operator--() {
	--ret;
	return static_cast<daughter &>(*this);
	};

	inline daughter & operator+=(const UInt n) {
	ret += n;
	return static_cast<daughter &>(*this);
	}
	inline daughter & operator-=(const UInt n) {
	ret -= n;
	return static_cast<daughter &>(*this);
	}

	inline reference operator[](const UInt n) { return ret[n]; }

	inline bool operator==(const iterator_internal & other) const {
	return ret == other.ret;
	}
	inline bool operator!=(const iterator_internal & other) const {
	return ret != other.ret;
	}
	inline bool operator<(const iterator_internal & other) const {
	return ret < other.ret;
	}
	inline bool operator<=(const iterator_internal & other) const {
	return ret <= other.ret;
	}
	inline bool operator>(const iterator_internal & other) const {
	return ret > other.ret;
	}
	inline bool operator>=(const iterator_internal & other) const {
	return ret >= other.ret;
	}

	inline daughter operator-(difference_type n) { return daughter(ret - n); }
	inline daughter operator+(difference_type n) { return daughter(ret + n); }

	inline difference_type operator-(const iterator_internal & b) {
	return ret - b.ret;
	}

	inline pointer data() const { return ret; }

	protected:
	pointer ret{nullptr};
	pointer initial{nullptr};
	};

	/* -------------------------------------------------------------------------- */
	/**
	* Specialization for scalar types
	*/
	template <class T, bool is_scal>
	template <class R, class daughter, class IR>
	class Array<T, is_scal>::iterator_internal<R, daughter, IR, true> {
	public:
	using value_type = R;
	using pointer = R *;
	using reference = R &;
	using proxy = typename R::proxy;
	using const_proxy = const typename R::proxy;
	using const_reference = const R &;
	using internal_value_type = IR;
	using internal_pointer = IR *;
	using difference_type = std::ptrdiff_t;
	using iterator_category = std::random_access_iterator_tag;
	using pointer_type = typename Array<T, is_scal>::pointer_type;

	public:
	iterator_internal() = default;

	iterator_internal(pointer_type data, UInt _offset)
	: _offset(_offset), initial(data), ret(nullptr), ret_ptr(data) {
	AKANTU_ERROR(
	"The constructor should never be called it is just an ugly trick...");
	}

	iterator_internal(std::unique_ptr<internal_value_type> && wrapped)
	: _offset(wrapped->size()), initial(wrapped->storage()),
	ret(std::move(wrapped)), ret_ptr(ret->storage()) {}

	iterator_internal(const iterator_internal & it) {
	if (this != &it) {
	this->_offset = it._offset;
	this->initial = it.initial;
	this->ret_ptr = it.ret_ptr;
	this->ret = std::make_unique<internal_value_type>(*it.ret, false);
	}
	}

	iterator_internal(iterator_internal && it) = default;

	virtual ~iterator_internal() = default;

	inline iterator_internal & operator=(const iterator_internal & it) {
	if (this != &it) {
	this->_offset = it._offset;
	this->initial = it.initial;
	this->ret_ptr = it.ret_ptr;
	if (this->ret)
	this->ret->shallowCopy(*it.ret);
	else
	this->ret = std::make_unique<internal_value_type>(*it.ret, false);
	}
	return *this;
	}

	UInt getCurrentIndex() {
	return (this->ret_ptr - this->initial) / this->_offset;
	};

	inline reference operator*() {
	ret->values = ret_ptr;
	return *ret;
	};
	inline const_reference operator*() const {
	ret->values = ret_ptr;
	return *ret;
	};
	inline pointer operator->() {
	ret->values = ret_ptr;
	return ret.get();
	};
	inline daughter & operator++() {
	ret_ptr += _offset;
	return static_cast<daughter &>(*this);
	};
	inline daughter & operator--() {
	ret_ptr -= _offset;
	return static_cast<daughter &>(*this);
	};

	inline daughter & operator+=(const UInt n) {
	ret_ptr += _offset * n;
	return static_cast<daughter &>(*this);
	}
	inline daughter & operator-=(const UInt n) {
	ret_ptr -= _offset * n;
	return static_cast<daughter &>(*this);
	}

	inline proxy operator[](const UInt n) {
	ret->values = ret_ptr + n * _offset;
	return proxy(*ret);
	}
	inline const_proxy operator[](const UInt n) const {
	ret->values = ret_ptr + n * _offset;
	return const_proxy(*ret);
	}

	inline bool operator==(const iterator_internal & other) const {
	return this->ret_ptr == other.ret_ptr;
	}
	inline bool operator!=(const iterator_internal & other) const {
	return this->ret_ptr != other.ret_ptr;
	}
	inline bool operator<(const iterator_internal & other) const {
	return this->ret_ptr < other.ret_ptr;
	}
	inline bool operator<=(const iterator_internal & other) const {
	return this->ret_ptr <= other.ret_ptr;
	}
	inline bool operator>(const iterator_internal & other) const {
	return this->ret_ptr > other.ret_ptr;
	}
	inline bool operator>=(const iterator_internal & other) const {
	return this->ret_ptr >= other.ret_ptr;
	}

	inline daughter operator+(difference_type n) {
	daughter tmp(static_cast<daughter &>(*this));
	tmp += n;
	return tmp;
	}
	inline daughter operator-(difference_type n) {
	daughter tmp(static_cast<daughter &>(*this));
	tmp -= n;
	return tmp;
	}

	inline difference_type operator-(const iterator_internal & b) {
	return (this->ret_ptr - b.ret_ptr) / _offset;
	}

	inline pointer_type data() const { return ret_ptr; }
	inline difference_type offset() const { return _offset; }

	protected:
	UInt _offset{0};
	pointer_type initial{nullptr};
	std::unique_ptr<internal_value_type> ret{nullptr};
	pointer_type ret_ptr{nullptr};
	};

	/* -------------------------------------------------------------------------- */
	/* Iterators */
	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	template <typename R>
	class Array<T, is_scal>::const_iterator
	: public iterator_internal<const R, Array<T, is_scal>::const_iterator<R>,
	R> {
	public:
	using parent = iterator_internal<const R, const_iterator, R>;
	using value_type = typename parent::value_type;
	using pointer = typename parent::pointer;
	using reference = typename parent::reference;
	using difference_type = typename parent::difference_type;
	using iterator_category = typename parent::iterator_category;

	public:
	const_iterator() : parent(){};
	// const_iterator(pointer_type data, UInt offset) : parent(data, offset) {}
	// const_iterator(pointer warped) : parent(warped) {}
	// const_iterator(const parent & it) : parent(it) {}

	const_iterator(const const_iterator & it) = default;
	const_iterator(const_iterator && it) = default;

	template <typename P,
	typename = std::enable_if_t<not aka::is_tensor<P>::value>>
	const_iterator(P * data) : parent(data) {}

	template <typename UP_P, typename = std::enable_if_t<aka::is_tensor<
	typename UP_P::element_type>::value>>
	const_iterator(UP_P && tensor) : parent(std::forward<UP_P>(tensor)) {}

	const_iterator & operator=(const const_iterator & it) = default;
	};

	/* -------------------------------------------------------------------------- */
	template <class T, class R, bool is_tensor_ = aka::is_tensor<R>::value>
	struct ConstConverterIteratorHelper {
	using const_iterator = typename Array<T>::template const_iterator<R>;
	using iterator = typename Array<T>::template iterator<R>;

	static inline const_iterator convert(const iterator & it) {
	return const_iterator(std::unique_ptr<R>(new R(*it, false)));
	}
	};

	template <class T, class R> struct ConstConverterIteratorHelper<T, R, false> {
	using const_iterator = typename Array<T>::template const_iterator<R>;
	using iterator = typename Array<T>::template iterator<R>;
	static inline const_iterator convert(const iterator & it) {
	return const_iterator(it.data());
	}
	};

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	template <typename R>
	class Array<T, is_scal>::iterator
	: public iterator_internal<R, Array<T, is_scal>::iterator<R>> {
	public:
	using parent = iterator_internal<R, iterator>;
	using value_type = typename parent::value_type;
	using pointer = typename parent::pointer;
	using reference = typename parent::reference;
	using difference_type = typename parent::difference_type;
	using iterator_category = typename parent::iterator_category;

	public:
	iterator() : parent(){};
	iterator(const iterator & it) = default;
	iterator(iterator && it) = default;

	template <typename P,
	typename = std::enable_if_t<not aka::is_tensor<P>::value>>
	iterator(P * data) : parent(data) {}

	template <typename UP_P, typename = std::enable_if_t<aka::is_tensor<
	typename UP_P::element_type>::value>>
	iterator(UP_P && tensor) : parent(std::forward<UP_P>(tensor)) {}

	iterator & operator=(const iterator & it) = default;

	operator const_iterator<R>() {
	return ConstConverterIteratorHelper<T, R>::convert(*this);
	}
	};

	/* -------------------------------------------------------------------------- */
	/* Begin/End functions implementation */
	/* -------------------------------------------------------------------------- */
	namespace detail {
	template <class Tuple, size_t... Is>
	constexpr auto take_front_impl(Tuple && t, std::index_sequence<Is...>) {
	return std::make_tuple(std::get<Is>(std::forward<Tuple>(t))...);
	}

	template <size_t N, class Tuple> constexpr auto take_front(Tuple && t) {
	return take_front_impl(std::forward<Tuple>(t),
	std::make_index_sequence<N>{});
	}

	template <typename... V> constexpr auto product_all(V &&... v) {
	std::common_type_t<int, V...> result = 1;
	(void)std::initializer_list<int>{(result *= v, 0)...};
	return result;
	}

	template <typename... T> std::string to_string_all(T &&... t) {
	if (sizeof...(T) == 0)
	return "";

	std::stringstream ss;
	bool noComma = true;
	ss << "(";
	(void)std::initializer_list<bool>{
	(ss << (noComma ? "" : ", ") << t, noComma = false)...};
	ss << ")";
	return ss.str();
	}

	template <std::size_t N> struct InstantiationHelper {
	template <typename type, typename T, typename... Ns>
	static auto instantiate(T && data, Ns... ns) {
	return std::make_unique<type>(data, ns...);
	}
	};

	template <> struct InstantiationHelper<0> {
	template <typename type, typename T> static auto instantiate(T && data) {
	return data;
	}
	};

	template <typename Arr, typename T, typename... Ns>
	decltype(auto) get_iterator(Arr && array, T * data, Ns &&... ns) {
	using type = IteratorHelper_t<sizeof...(Ns) - 1, T>;
	using array_type = std::decay_t<Arr>;
	using iterator =
	std::conditional_t<std::is_const<std::remove_reference_t<Arr>>::value,
	typename array_type::template const_iterator<type>,
	typename array_type::template iterator<type>>;
	static_assert(sizeof...(Ns), "You should provide a least one size");

	if (array.getNbComponent() * array.size() !=
	product_all(std::forward<Ns>(ns)...)) {
	AKANTU_CUSTOM_EXCEPTION_INFO(
	debug::ArrayException(),
	"The iterator on "
	<< debug::demangle(typeid(Arr).name())
	<< to_string_all(array.size(), array.getNbComponent())
	<< "is not compatible with the type "
	<< debug::demangle(typeid(type).name()) << to_string_all(ns...));
	}

	auto && wrapped = aka::apply(
	[&](auto... n) {
	return InstantiationHelper<sizeof...(n)>::template instantiate<type>(
	data, n...);
	},
	take_front<sizeof...(Ns) - 1>(std::make_tuple(ns...)));

	return iterator(std::move(wrapped));
	}
	} // namespace detail

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	template <typename... Ns>
	inline decltype(auto) Array<T, is_scal>::begin(Ns &&... ns) {
	return detail::get_iterator(*this, this->values, std::forward<Ns>(ns)...,
	this->size_);
	}

	template <class T, bool is_scal>
	template <typename... Ns>
	inline decltype(auto) Array<T, is_scal>::end(Ns &&... ns) {
	return detail::get_iterator(*this,
	this->values + this->nb_component * this->size_,
	std::forward<Ns>(ns)..., this->size_);
	}

	template <class T, bool is_scal>
	template <typename... Ns>
	inline decltype(auto) Array<T, is_scal>::begin(Ns &&... ns) const {
	return detail::get_iterator(*this, this->values, std::forward<Ns>(ns)...,
	this->size_);
	}

	template <class T, bool is_scal>
	template <typename... Ns>
	inline decltype(auto) Array<T, is_scal>::end(Ns &&... ns) const {
	return detail::get_iterator(*this,
	this->values + this->nb_component * this->size_,
	std::forward<Ns>(ns)..., this->size_);
	}

	template <class T, bool is_scal>
	template <typename... Ns>
	inline decltype(auto) Array<T, is_scal>::begin_reinterpret(Ns &&... ns) {
	return detail::get_iterator(*this, this->values, std::forward<Ns>(ns)...);
	}

	template <class T, bool is_scal>
	template <typename... Ns>
	inline decltype(auto) Array<T, is_scal>::end_reinterpret(Ns &&... ns) {
	return detail::get_iterator(
	*this, this->values + detail::product_all(std::forward<Ns>(ns)...),
	std::forward<Ns>(ns)...);
	}

	template <class T, bool is_scal>
	template <typename... Ns>
	inline decltype(auto) Array<T, is_scal>::begin_reinterpret(Ns &&... ns) const {
	return detail::get_iterator(*this, this->values, std::forward<Ns>(ns)...);
	}

	template <class T, bool is_scal>
	template <typename... Ns>
	inline decltype(auto) Array<T, is_scal>::end_reinterpret(Ns &&... ns) const {
	return detail::get_iterator(
	*this, this->values + detail::product_all(std::forward<Ns>(ns)...),
	std::forward<Ns>(ns)...);
	}

	/* -------------------------------------------------------------------------- */
	/* Views */
	/* -------------------------------------------------------------------------- */
	namespace detail {
	template <typename Array, typename... Ns> class ArrayView {
	using tuple = std::tuple<Ns...>;

	public:
	ArrayView(Array && array, Ns... ns)
	: array(array), sizes(std::move(ns)...) {}

	ArrayView(ArrayView && array_view) = default;

	ArrayView & operator=(const ArrayView & array_view) = default;
	ArrayView & operator=(ArrayView && array_view) = default;

	decltype(auto) begin() {
	return aka::apply(
	[&](auto &&... ns) { return array.get().begin_reinterpret(ns...); },
	sizes);
	}

	decltype(auto) begin() const {
	return aka::apply(
	[&](auto &&... ns) { return array.get().begin_reinterpret(ns...); },
	sizes);
	}

	decltype(auto) end() {
	return aka::apply(
	[&](auto &&... ns) { return array.get().end_reinterpret(ns...); },
	sizes);
	}

	decltype(auto) end() const {
	return aka::apply(
	[&](auto &&... ns) { return array.get().end_reinterpret(ns...); },
	sizes);
	}

	decltype(auto) size() const {
	return std::get<std::tuple_size<tuple>::value - 1>(sizes);
	}

	decltype(auto) dims() const { return std::tuple_size<tuple>::value - 1; }

	private:
	std::reference_wrapper<std::remove_reference_t<Array>> array;
	tuple sizes;
	};
	} // namespace detail

	/* -------------------------------------------------------------------------- */
	template <typename Array, typename... Ns>
	decltype(auto) make_view(Array && array, Ns... ns) {
	static_assert(aka::conjunction<std::is_integral<std::decay_t<Ns>>...>::value,
	"Ns should be integral types");
	auto size = std::forward<decltype(array)>(array).size() *
	std::forward<decltype(array)>(array).getNbComponent() /
	detail::product_all(ns...);

	return detail::ArrayView<Array, std::common_type_t<size_t, Ns>...,
	std::common_type_t<size_t, decltype(size)>>(
	std::forward<Array>(array), std::move(ns)..., size);
	}

	/* -------------------------------------------------------------------------- */
	template <class T, bool is_scal>
	template <typename R>
	inline typename Array<T, is_scal>::template iterator<R>
	Array<T, is_scal>::erase(const iterator<R> & it) {
	T * curr = it.data();
	UInt pos = (curr - this->values) / this->nb_component;
	erase(pos);
	iterator<R> rit = it;
	return --rit;
	}

	} // namespace akantu

	#endif /* __AKANTU_AKA_ARRAY_TMPL_HH__ */

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