aka_enumerate_iterator.hh
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aka_enumerate_iterator.hh
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			/**
			* @file aka_enumerate_iterator.hh
			*
			* @author Nicolas Richart
			*
			* @date creation jeu déc 12 2019
			*
			* @brief implementation of enumerate.
			*
			* @section LICENSE
			*
			* Copyright (©) 2010-2011 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 "iterators/aka_zip_iterator.hh"
			/* -------------------------------------------------------------------------- */
			#include <iterator>
			#include <utility>
			/* -------------------------------------------------------------------------- */

			#ifndef AKA_ENUMERATE_ITERATOR_HH
			#define AKA_ENUMERATE_ITERATOR_HH

			#ifndef AKANTU_ITERATORS_NAMESPACE
			#define AKANTU_ITERATORS_NAMESPACE akantu
			#endif

			namespace AKANTU_ITERATORS_NAMESPACE {

			/* -------------------------------------------------------------------------- */
			namespace iterators {
			template <class Iterator> class EnumerateIterator {
			public:
			using value_type =
			std::tuple<std::size_t,
			typename std::iterator_traits<Iterator>::value_type>;
			using difference_type = std::size_t;
			using pointer =
			std::tuple<std::size_t,
			typename std::iterator_traits<Iterator>::pointer>;
			using reference =
			std::tuple<std::size_t,
			typename std::iterator_traits<Iterator>::reference>;
			using iterator_category = std::input_iterator_tag;

			public:
			explicit EnumerateIterator(Iterator && iterator) : iterator(iterator) {}

			// input iterator ++it
			EnumerateIterator & operator++() {
			++iterator;
			++index;
			return *this;
			}

			// input iterator it++
			EnumerateIterator operator++(int) {
			auto cpy = *this;
			this->operator++();
			return cpy;
			}

			// input iterator it != other_it
			bool operator!=(const EnumerateIterator & other) const {
			return iterator != other.iterator;
			}

			// input iterator dereference *it
			decltype(auto) operator*() {
			return std::tuple_cat(std::make_tuple(index), *iterator);
			}

			bool operator==(const EnumerateIterator & other) const {
			return not this->operator!=(other);
			}

			private:
			Iterator iterator;
			size_t index{0};
			};

			template <class Iterator>
			inline constexpr decltype(auto) enumerate(Iterator && iterator) {
			return EnumerateIterator<Iterator>(std::forward<Iterator>(iterator));
			}

			} // namespace iterators

			namespace containers {
			template <class... Containers> class EnumerateContainer {
			public:
			explicit EnumerateContainer(Containers &&... containers)
			: zip_container(std::forward<Containers>(containers)...) {}

			decltype(auto) begin() {
			return iterators::enumerate(zip_container.begin());
			}

			decltype(auto) begin() const {
			return iterators::enumerate(zip_container.begin());
			}

			decltype(auto) end() { return iterators::enumerate(zip_container.end()); }

			decltype(auto) end() const {
			return iterators::enumerate(zip_container.end());
			}

			private:
			ZipContainer<Containers...> zip_container;
			};
			} // namespace containers

			template <class... Container>
			inline constexpr decltype(auto) enumerate(Container &&... container) {
			return containers::EnumerateContainer<Container...>(
			std::forward<Container>(container)...);
			}

			} // namespace AKANTU_ITERATORS_NAMESPACE

			namespace std {
			template <class Iterator>
			struct iterator_traits<
			::AKANTU_ITERATORS_NAMESPACE::iterators::EnumerateIterator<Iterator>> {
			private:
			using iterator_type =
			typename ::AKANTU_ITERATORS_NAMESPACE::iterators::EnumerateIterator<
			Iterator>;

			public:
			using iterator_category = typename iterator_type::iterator_category;
			using value_type = typename iterator_type::value_type;
			using difference_type = typename iterator_type::difference_type;
			using pointer = typename iterator_type::pointer;
			using reference = typename iterator_type::reference;
			};
			} // namespace std

			#endif /* AKA_ENUMERATE_ITERATOR_HH */

rAKA/include/iterators/aka_enumerate_iterator.hh3889358d690amaster

aka_enumerate_iterator.hhView Options

rAKA/include/iterators/aka_enumerate_iterator.hh
3889358d690amaster

aka_enumerate_iterator.hh
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