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|---|---|---|---|
| 1 | // -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- | ||
| 2 | // vi: set et ts=4 sw=4 sts=4: | ||
| 3 | // | ||
| 4 | // SPDX-FileCopyrightText: Copyright © DuMux Project contributors, see AUTHORS.md in root folder | ||
| 5 | // SPDX-License-Identifier: GPL-3.0-or-later | ||
| 6 | // | ||
| 7 | /*! | ||
| 8 | * \file | ||
| 9 | * \ingroup Core | ||
| 10 | * \brief A Python-like enumerate function | ||
| 11 | */ | ||
| 12 | |||
| 13 | #ifndef DUMUX_COMMON_ENUMERATE_HH | ||
| 14 | #define DUMUX_COMMON_ENUMERATE_HH | ||
| 15 | |||
| 16 | #include <tuple> | ||
| 17 | #include <iterator> | ||
| 18 | |||
| 19 | namespace Dumux { | ||
| 20 | |||
| 21 | /*! | ||
| 22 | * \brief A Python-like enumerate function | ||
| 23 | * \param iterable Some iterable type with begin/end (e.g. std::vector) | ||
| 24 | * \note From Nathan Reed (CC BY 4.0): http://reedbeta.com/blog/python-like-enumerate-in-cpp17/ | ||
| 25 | * | ||
| 26 | * Usage example: for (const auto& [i, item] : enumerate(list)) | ||
| 27 | */ | ||
| 28 | template <typename Range, | ||
| 29 | typename RangeIterator = decltype(std::begin(std::declval<Range>())), | ||
| 30 | typename = decltype(std::end(std::declval<Range>()))> | ||
| 31 | 1246981 | constexpr auto enumerate(Range&& iterable) | |
| 32 | { | ||
| 33 | struct Iterator | ||
| 34 | { | ||
| 35 | std::size_t i; | ||
| 36 | RangeIterator iter; | ||
| 37 |
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59131342 | bool operator != (const Iterator & other) const { return iter != other.iter; } |
| 38 | 44938706 | void operator ++ () { ++i; ++iter; } | |
| 39 |
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44938706 | auto operator * () const { return std::tie(i, *iter); } |
| 40 | }; | ||
| 41 | |||
| 42 | struct Iterable | ||
| 43 | { | ||
| 44 | Range iterable; | ||
| 45 | 14192636 | auto begin() { return Iterator{ 0, std::begin(iterable) }; } | |
| 46 | 14192636 | auto end() { return Iterator{ 0, std::end(iterable) }; } | |
| 47 | }; | ||
| 48 | |||
| 49 | return Iterable{ std::forward<Range>(iterable) }; | ||
| 50 | } | ||
| 51 | |||
| 52 | } // end namespace Dumux | ||
| 53 | |||
| 54 | #endif | ||
| 55 |