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aka_view_iterators.hh
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			/**
			* Copyright (©) 2018-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			*
			* This file is part of Akantu
			*
			* 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/>.
			*/

			/* -------------------------------------------------------------------------- */
			#include "aka_common.hh"
			//#include "aka_types.hh"
			/* -------------------------------------------------------------------------- */
			#include <memory>
			/* -------------------------------------------------------------------------- */

			#ifndef __AKANTU_AKA_VIEW_ITERATORS_HH__
			#define __AKANTU_AKA_VIEW_ITERATORS_HH__

			namespace akantu {
			template <typename T, Int ndim> class TensorBase;
			}

			namespace akantu {
			/* -------------------------------------------------------------------------- */
			/* Iterators */
			/* -------------------------------------------------------------------------- */
			namespace detail {
			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 <class R> struct IteratorHelper { static constexpr Int dim = 0; };

			template <class Derived> struct IteratorHelper<Eigen::MatrixBase<Derived>> {
			private:
			using T = typename Derived::Scalar;
			static constexpr Int m = Derived::RowsAtCompileTime;
			static constexpr Int n = Derived::ColsAtCompileTime;

			public:
			static constexpr Int dim =
			Eigen::MatrixBase<Derived>::IsVectorAtCompileTime ? 1 : 2;
			using pointer = T *;
			using proxy = Eigen::Map<Eigen::Matrix<T, m, n>>;
			using const_proxy = Eigen::Map<const Eigen::Matrix<T, m, n>>;
			};

			template <class Derived> struct IteratorHelper<Eigen::Map<Derived>> {
			private:
			using T = typename Derived::Scalar;
			static constexpr Int m = Derived::RowsAtCompileTime;
			static constexpr Int n = Derived::ColsAtCompileTime;

			public:
			static constexpr Int dim =
			Derived::IsVectorAtCompileTime and m != 1 ? 1 : 2;
			using pointer =
			std::conditional_t<std::is_const_v<Derived>, const T , T >;
			using proxy = Eigen::Map<Derived>;
			using const_proxy = Eigen::Map<const Derived>;
			};

			template <typename T, Int _dim> struct IteratorHelper<TensorBase<T, _dim>> {
			static constexpr Int dim = _dim;
			using pointer = T *;
			using proxy = TensorProxy<T, _dim>;
			using const_proxy = TensorProxy<const T, _dim>;
			};

			template <typename T, Int _dim> struct IteratorHelper<TensorProxy<T, _dim>> {
			static constexpr Int dim = _dim;
			using pointer = T *;
			using proxy = TensorProxy<T, _dim>;
			using const_proxy = TensorProxy<const T, _dim>;
			};

			/* ------------------------------------------------------------------------ */
			template <class R, class daughter, class IR = R,
			Int dim = IteratorHelper<std::decay_t<R>>::dim>
			class internal_view_iterator {
			protected:
			using helper = IteratorHelper<std::decay_t<R>>;
			using internal_value_type = IR;
			using internal_pointer = IR *;
			using scalar_pointer = typename helper::pointer;
			using proxy_t = typename helper::proxy;
			static constexpr int dim_ = dim;

			public:
			using pointer = proxy_t *;
			using value_type = proxy_t;
			using reference = proxy_t &;
			using difference_type = Int;
			using iterator_category = std::random_access_iterator_tag;

			private:
			template <class ProxyType, std::size_t... I>
			constexpr auto get_new_proxy(scalar_pointer data,
			std::index_sequence<I...>) const {
			return ProxyType(data, dims[I]...);
			}

			constexpr auto get_new_proxy(scalar_pointer data) {
			return this->template get_new_proxy<proxy_t>(
			data, std::make_index_sequence<dim>());
			}

			constexpr auto get_new_proxy(scalar_pointer data) const {
			return this->template get_new_proxy<proxy_t>(
			data, std::make_index_sequence<dim>());
			}

			template <std::size_t... I>
			constexpr void reset_proxy(std::index_sequence<I...>) {
			new (&proxy) proxy_t(ret_ptr, dims[I]...);
			}

			constexpr auto reset_proxy() {
			return reset_proxy(std::make_index_sequence<dim>());
			}

			protected:
			template <typename OR, typename OD, typename OIR,
			std::enable_if_t<std::is_convertible<
			decltype(std::declval<OIR>().data()),
			decltype(std::declval<IR>().data())>::value> * = nullptr>
			explicit internal_view_iterator(
			internal_view_iterator<OR, OD, OIR, dim> & it)
			: dims(it.dims), _offset(it._offset), initial(it.initial),
			ret_ptr(it.ret_ptr), proxy(get_new_proxy(it.ret_ptr)) {}

			template <typename OR, typename OD, typename OIR, Int _dim>
			friend class internal_view_iterator;

			template <typename... Args>
			using valid_args_t = std::enable_if_t<
			aka::conjunction<aka::disjunction<std::is_integral<Args>,
			std::is_enum<Args>>...>::value and
			dim == sizeof...(Args),
			int>;

			public:
			/// Generic constructor dor any tensor dimension
			template <typename... Ns, valid_args_t<Ns...> = 0>
			internal_view_iterator(scalar_pointer data, Ns... ns)
			: dims({Int(ns)...}),
			_offset(detail::product_all(std::forward<Ns>(ns)...)), initial(data),
			ret_ptr(data), proxy(data, ns...) {}

			// Specific constructor for Vector of static size 1
			template <typename RD = std::decay_t<R>,
			std::enable_if_t<aka::is_eigen_map<RD>::value and
			RD::RowsAtCompileTime == 1 and
			RD::ColsAtCompileTime == 1> * = nullptr>
			constexpr internal_view_iterator(scalar_pointer data, Idx rows)
			: dims({rows, 1}), _offset(rows), initial(data), ret_ptr(data),
			proxy(data, rows, 1) {
			assert(rows == 1 && "1x1 Matrix");
			}

			/// Specific constructor for Eigen::Map<Matrix> that look like
			/// Eigen::Map<Vector>
			template <typename RD = std::decay_t<R>,
			std::enable_if_t<(RD::RowsAtCompileTime != 1) and
			RD::ColsAtCompileTime == 1> * = nullptr>
			constexpr internal_view_iterator(scalar_pointer data, Idx rows,
			[[gnu::unused]] Idx cols)
			: dims({rows}), _offset(rows), initial(data), ret_ptr(data),
			proxy(data, rows, 1) {
			assert(cols == 1 && "nx1 Matrix");
			}

			/// Default constructor for Eigen::Map<Vector>
			template <Int _dim = dim, typename RD = std::decay_t<R>,
			std::enable_if_t<_dim == 1> * = nullptr>
			internal_view_iterator()
			: proxy(reinterpret_cast<scalar_pointer>(0xdeadbeaf),
			RD::RowsAtCompileTime == Eigen::Dynamic
			? 1
			: RD::RowsAtCompileTime) {
			// initialized to a fake pointer to pass the static_assert in Eigen
			// this proxy should not be returned
			}

			/// Default constructor for Eigen::Map<Matrix>
			template <Int _dim = dim, typename RD = std::decay_t<R>,
			std::enable_if_t<_dim == 2> * = nullptr>
			internal_view_iterator()
			: proxy(reinterpret_cast<scalar_pointer>(0xdeadbeaf),
			RD::RowsAtCompileTime == Eigen::Dynamic ? 1
			: RD::RowsAtCompileTime,
			RD::ColsAtCompileTime == Eigen::Dynamic
			? 1
			: RD::ColsAtCompileTime) {
			// initialized to a fake pointer to pass the `static_assert` in `Eigen
			// this proxy should not be returned
			}

			template <Int _dim = dim, typename RD = std::decay_t<R>,
			std::enable_if_t<(_dim > 2)> * = nullptr>
			internal_view_iterator() {}

			internal_view_iterator(const internal_view_iterator & it)
			: dims(it.dims), _offset(it._offset), initial(it.initial),
			ret_ptr(it.ret_ptr), proxy(get_new_proxy(it.ret_ptr)) {}

			internal_view_iterator &
			operator=(internal_view_iterator && it) noexcept = default;
			internal_view_iterator(internal_view_iterator && it) noexcept = default;

			virtual ~internal_view_iterator() = default;

			template <typename OR, typename OD, typename OIR,
			std::enable_if_t<std::is_convertible<
			decltype(std::declval<OIR>().data()),
			decltype(std::declval<IR>().data())>::value> * = nullptr>
			inline internal_view_iterator &
			operator=(const internal_view_iterator<OR, OD, OIR, dim> & it) {
			this->dims = it.dims;
			this->_offset = it._offset;
			this->initial = it.initial;
			this->ret_ptr = it.ret_ptr;
			reset_proxy();
			return *this;
			}

			inline internal_view_iterator &
			operator=(const internal_view_iterator & it) {
			if (this != &it) {
			this->dims = it.dims;
			this->_offset = it._offset;
			this->initial = it.initial;
			this->ret_ptr = it.ret_ptr;
			reset_proxy();
			}
			return *this;
			}

			public:
			Idx getCurrentIndex() {
			return (this->ret_ptr - this->initial) / this->_offset;
			}

			inline reference operator*() {
			this->reset_proxy();
			return proxy;
			}

			inline pointer operator->() {
			reset_proxy();
			return &proxy;
			}

			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+=(Idx n) {
			ret_ptr += _offset * n;
			return static_cast<daughter &>(*this);
			}

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

			inline auto operator[](Idx n) {
			return get_new_proxy(ret_ptr + n * _offset);
			}

			inline auto operator[](Idx n) const {
			return get_new_proxy(ret_ptr + n * _offset);
			}

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

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

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

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

			inline bool operator>(const internal_view_iterator & other) const {
			return this->ret_ptr > other.ret_ptr;
			}

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

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

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

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

			inline scalar_pointer data() const { return ret_ptr; }
			inline difference_type offset() const { return _offset; }
			inline decltype(auto) getDims() const { return dims; }

			protected:
			std::array<Int, dim> dims;
			difference_type _offset{0};
			scalar_pointer initial{nullptr};
			scalar_pointer ret_ptr{nullptr};
			proxy_t proxy;
			};

			/* ------------------------------------------------------------------------ */
			/**
			* Specialization for scalar types
			*/
			template <class R, class daughter, class IR>
			class internal_view_iterator<R, daughter, IR, 0> {
			public:
			using value_type = R;
			using pointer = R *;
			using reference = R &;
			using const_reference = const R &;
			using difference_type = Idx; // std::ptrdiff_t;
			using iterator_category = std::random_access_iterator_tag;
			static constexpr int dim_ = 0;

			protected:
			using internal_value_type = IR;
			using internal_pointer = IR *;

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

			virtual ~internal_view_iterator() = default;

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

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

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

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

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

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

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

			inline pointer data() const { return ret; }
			inline decltype(auto) getDims() const { return dims; }

			protected:
			std::array<int, 0> dims;
			pointer ret{nullptr};
			pointer initial{nullptr};
			};
			} // namespace detail

			/* -------------------------------------------------------------------------- */
			template <typename R> class view_iterator;

			template <typename R>
			class const_view_iterator
			: public detail::internal_view_iterator<const R, const_view_iterator<R>,
			R> {
			public:
			using parent =
			detail::internal_view_iterator<const R, const_view_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;

			protected:
			template <typename Iterator, std::size_t... I>
			static inline auto convert_helper(const Iterator & it,
			std::index_sequence<I...>) {
			return const_view_iterator(it.data(), it.getDims()[I]...);
			}
			template <typename Iterator> static inline auto convert(const Iterator & it) {
			return convert_helper(it, std::make_index_sequence<parent::dim_>());
			}

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

			template <typename P, typename... Ns>
			const_view_iterator(P * data, Ns... ns) : parent(data, ns...) {}

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

			template <typename OR,
			std::enable_if_t<not std::is_same<R, OR>::value> * = nullptr>
			const_view_iterator(const const_view_iterator<OR> & it)
			: parent(convert(it)) {}

			template <typename OR,
			std::enable_if_t<std::is_convertible<R, OR>::value> * = nullptr>
			const_view_iterator(const view_iterator<OR> & it) : parent(convert(it)) {}

			template <typename OR,
			std::enable_if_t<not std::is_same<R, OR>::value and
			std::is_convertible<R, OR>::value> * = nullptr>
			const_view_iterator & operator=(const const_view_iterator<OR> & it) {
			return dynamic_cast<const_view_iterator &>(parent::operator=(it));
			}

			template <typename OR,
			std::enable_if_t<std::is_convertible<R, OR>::value> * = nullptr>
			const_view_iterator operator=(const view_iterator<OR> & it) {
			return convert(it);
			}
			};

			template <class R, bool is_tensor_ = aka::is_tensor<R>::value>
			struct ConstConverterIteratorHelper {
			protected:
			template <std::size_t... I>
			static inline auto convert_helper(const view_iterator<R> & it,
			std::index_sequence<I...>) {
			return const_view_iterator<R>(it.data(), it.getDims()[I]...);
			}

			public:
			static inline auto convert(const view_iterator<R> & it) {
			return convert_helper(
			it, std::make_index_sequence<
			std::tuple_size<decltype(it.getDims())>::value>());
			}
			};

			template <class R> struct ConstConverterIteratorHelper<R, false> {
			static inline auto convert(const view_iterator<R> & it) {
			return const_view_iterator<R>(it.data());
			}
			};

			template <typename R>
			class view_iterator
			: public detail::internal_view_iterator<R, view_iterator<R>> {
			public:
			using parent = detail::internal_view_iterator<R, view_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:
			view_iterator() : parent(){};
			view_iterator(const view_iterator & it) = default;
			view_iterator(view_iterator && it) = default;

			template <typename P, typename... Ns>
			view_iterator(P * data, Ns... ns) : parent(data, ns...) {}

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

			operator const_view_iterator<R>() {
			return ConstConverterIteratorHelper<R>::convert(*this);
			}
			};

			namespace {
			template <std::size_t dim, typename T> struct ViewIteratorHelper {
			using type = TensorProxy<T, dim>;
			};

			template <typename T> struct ViewIteratorHelper<0, T> { using type = T; };
			template <typename T> struct ViewIteratorHelper<1, T> {
			using type = Eigen::Map<Eigen::Matrix<T, Eigen::Dynamic, 1>>;
			};
			template <typename T> struct ViewIteratorHelper<1, const T> {
			using type = Eigen::Map<const Eigen::Matrix<T, Eigen::Dynamic, 1>>;
			};

			template <typename T> struct ViewIteratorHelper<2, T> {
			using type = Eigen::Map<Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic>>;
			};

			template <typename T> struct ViewIteratorHelper<2, const T> {
			using type =
			Eigen::Map<const Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic>>;
			};

			template <std::size_t dim, typename T>
			using ViewIteratorHelper_t = typename ViewIteratorHelper<dim, T>::type;
			} // namespace

			} // namespace akantu

			#include <iterator>

			namespace std {

			template <typename R> struct iterator_traits<::akantu::const_view_iterator<R>> {
			protected:
			using iterator = ::akantu::const_view_iterator<R>;

			public:
			using iterator_category = typename iterator::iterator_category;
			using value_type = typename iterator::value_type;
			using difference_type = typename iterator::difference_type;
			using pointer = typename iterator::pointer;
			using reference = typename iterator::reference;
			};

			template <typename R> struct iterator_traits<::akantu::view_iterator<R>> {
			protected:
			using iterator = ::akantu::view_iterator<R>;

			public:
			using iterator_category = typename iterator::iterator_category;
			using value_type = typename iterator::value_type;
			using difference_type = typename iterator::difference_type;
			using pointer = typename iterator::pointer;
			using reference = typename iterator::reference;
			};

			} // namespace std

			#endif /* !__AKANTU_AKA_VIEW_ITERATORS_HH__ */

rAKA/src/common/aka_view_iterators.hh1db5ba830ccbfeatures/22-problem-in…

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rAKA/src/common/aka_view_iterators.hh
1db5ba830ccbfeatures/22-problem-in…

aka_view_iterators.hh
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