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mesh_iterators.hh
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			/**
			* @file mesh_iterators.hh
			*
			* @author Nicolas Richart <nicolas.richart@epfl.ch>
			*
			* @date creation: Thu Jul 16 2015
			* @date last modification: Thu Mar 11 2021
			*
			* @brief Set of helper classes to have fun with range based for
			*
			*
			* @section LICENSE
			*
			* Copyright (©) 2015-2021 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/>.
			*
			*/

			/* -------------------------------------------------------------------------- */
			#include "aka_named_argument.hh"
			#include "aka_static_if.hh"
			#include "mesh.hh"
			/* -------------------------------------------------------------------------- */

			#ifndef AKANTU_MESH_ITERATORS_HH_
			#define AKANTU_MESH_ITERATORS_HH_

			namespace akantu {

			class MeshElementsByTypes {
			using elements_iterator = Array<Element>::scalar_iterator;

			public:
			explicit MeshElementsByTypes(const Array<Element> & elements) {
			this->elements.copy(elements);
			std::sort(this->elements.begin(), this->elements.end());
			}

			/* ------------------------------------------------------------------------ */
			class MeshElementsRange {
			public:
			MeshElementsRange() = default;

			MeshElementsRange(const elements_iterator & begin,
			const elements_iterator & end)
			: type((begin).type), ghost_type((begin).ghost_type), begin(begin),
			end(end) {}

			AKANTU_GET_MACRO(Type, type, ElementType);
			AKANTU_GET_MACRO(GhostType, ghost_type, GhostType);

			const Array<UInt> & getElements() {
			elements.resize(end - begin);
			auto el_it = elements.begin();
			for (auto it = begin; it != end; ++it, ++el_it) {
			*el_it = it->element;
			}

			return elements;
			}

			private:
			ElementType type{_not_defined};
			GhostType ghost_type{_casper};
			elements_iterator begin;
			elements_iterator end;
			Array<UInt> elements;
			};

			/* ------------------------------------------------------------------------ */
			class iterator {
			struct element_comparator {
			bool operator()(const Element & lhs, const Element & rhs) const {
			return ((rhs == ElementNull) \|\| std::tie(lhs.ghost_type, lhs.type) <
			std::tie(rhs.ghost_type, rhs.type));
			}
			};

			public:
			iterator(const iterator &) = default;
			iterator(const elements_iterator & first, const elements_iterator & last)
			: range(std::equal_range(first, last, *first, element_comparator())),
			first(first), last(last) {}

			decltype(auto) operator*() const {
			return MeshElementsRange(range.first, range.second);
			}

			iterator operator++() {
			first = range.second;
			range = std::equal_range(first, last, *first, element_comparator());
			return *this;
			}

			bool operator==(const iterator & other) const {
			return (first == other.first and last == other.last);
			}

			bool operator!=(const iterator & other) const {
			return (not operator==(other));
			}

			private:
			std::pair<elements_iterator, elements_iterator> range;
			elements_iterator first;
			elements_iterator last;
			};

			iterator begin() { return iterator(elements.begin(), elements.end()); }
			iterator end() { return iterator(elements.end(), elements.end()); }

			private:
			Array<Element> elements;
			};

			/* -------------------------------------------------------------------------- */
			namespace mesh_iterators {
			namespace details {
			template <class internal_iterator> class delegated_iterator {
			public:
			using value_type = std::remove_pointer_t<
			typename internal_iterator::value_type::second_type>;
			using difference_type = std::ptrdiff_t;
			using pointer = value_type *;
			using reference = value_type &;
			using iterator_category = std::input_iterator_tag;

			explicit delegated_iterator(internal_iterator it) : it(std::move(it)) {}

			decltype(auto) operator*() {
			return std::forward<decltype((it->second))>((it->second));
			}

			delegated_iterator operator++() {
			++it;
			return *this;
			}

			bool operator==(const delegated_iterator & other) const {
			return other.it == it;
			}

			bool operator!=(const delegated_iterator & other) const {
			return other.it != it;
			}

			private:
			internal_iterator it;
			};
			} // namespace details
			} // namespace mesh_iterators

			/* -------------------------------------------------------------------------- */
			template <class Func>
			void for_each_element(UInt nb_elements, const Array<UInt> & filter_elements,
			Func && function) {
			if (filter_elements != empty_filter) {
			std::for_each(filter_elements.begin(), filter_elements.end(),
			std::forward<Func>(function));
			} else {
			auto && range = arange(nb_elements);
			std::for_each(range.begin(), range.end(), std::forward<Func>(function));
			}
			}

			/* -------------------------------------------------------------------------- */
			template <class Func, typename... pack>
			void for_each_element(const Mesh & mesh, Func && function, pack &&... _pack) {
			auto requested_ghost_type = OPTIONAL_NAMED_ARG(ghost_type, _casper);
			const ElementTypeMapArray<UInt> * filter =
			OPTIONAL_NAMED_ARG(element_filter, nullptr);

			bool all_ghost_types = requested_ghost_type == _casper;

			auto spatial_dimension =
			OPTIONAL_NAMED_ARG(spatial_dimension, mesh.getSpatialDimension());
			auto element_kind = OPTIONAL_NAMED_ARG(element_kind, _ek_not_defined);

			for (auto ghost_type : ghost_types) {
			if ((not(ghost_type == requested_ghost_type)) and (not all_ghost_types)) {
			continue;
			}

			auto element_types =
			mesh.elementTypes(spatial_dimension, ghost_type, element_kind);

			if (filter) {
			element_types =
			filter->elementTypes(spatial_dimension, ghost_type, element_kind);
			}

			for (auto type : element_types) {
			const Array<UInt> * filter_array;

			if (filter) {
			filter_array = &((*filter)(type, ghost_type));
			} else {
			filter_array = &empty_filter;
			}

			auto nb_elements = mesh.getNbElement(type, ghost_type);

			for_each_element(nb_elements, *filter_array, [&](auto && el) {
			auto element = Element{type, el, ghost_type};
			std::forward<Func>(function)(element);
			});
			}
			}
			}

			} // namespace akantu

			#endif /* AKANTU_MESH_ITERATORS_HH_ */

rAKA/src/mesh/mesh_iterators.hhcf25e59e090bfeatures/28-getelementi…

mesh_iterators.hhView Options

rAKA/src/mesh/mesh_iterators.hh
cf25e59e090bfeatures/28-getelementi…

mesh_iterators.hh
View Options