From 8bcf68977b002d79bfea79436b1c333cc1386df2 Mon Sep 17 00:00:00 2001
From: Timo Koch <timo.koch@iws.uni-stuttgart.de>
Date: Thu, 1 Oct 2020 16:24:04 +0200
Subject: [PATCH] [common] Add Python-like enumerate function for ranges
---
dumux/common/CMakeLists.txt | 1 +
dumux/common/enumerate.hh | 64 +++++++++++++++++++++++++++++++++++++
2 files changed, 65 insertions(+)
create mode 100644 dumux/common/enumerate.hh
diff --git a/dumux/common/CMakeLists.txt b/dumux/common/CMakeLists.txt
index e28f1c1fb6..f7fe41c5df 100644
--- a/dumux/common/CMakeLists.txt
+++ b/dumux/common/CMakeLists.txt
@@ -17,6 +17,7 @@ doubleexpintegrationconstants.hh
doubleexpintegrator.hh
dumuxmessage.hh
entitymap.hh
+enumerate.hh
exceptions.hh
fixedlengthspline_.hh
fvproblem.hh
diff --git a/dumux/common/enumerate.hh b/dumux/common/enumerate.hh
new file mode 100644
index 0000000000..d501cde0ab
--- /dev/null
+++ b/dumux/common/enumerate.hh
@@ -0,0 +1,64 @@
+// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+// vi: set et ts=4 sw=4 sts=4:
+/*****************************************************************************
+ * See the file COPYING for full copying permissions. *
+ * *
+ * This program is free software: you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation, either version 3 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program 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 General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. *
+ *****************************************************************************/
+/*!
+ * \file
+ * \brief A Python-like enumerate function
+ */
+
+#ifndef DUMUX_COMMON_ENUMERATE_HH
+#define DUMUX_COMMON_ENUMERATE_HH
+
+#include <tuple>
+
+namespace Dumux {
+
+/*!
+ * \brief A Python-like enumerate function
+ * \param iterable Some iterable type with begin/end (e.g. std::vector)
+ * \note From Nathan Reed (CC BY 4.0): http://reedbeta.com/blog/python-like-enumerate-in-cpp17/
+ *
+ * Usage example: for (const auto& [i, item] : enumerate(list))
+ */
+template <typename Range,
+ typename RangeIterator = decltype(std::begin(std::declval<Range>())),
+ typename = decltype(std::end(std::declval<Range>()))>
+constexpr auto enumerate(Range&& iterable)
+{
+ struct Iterator
+ {
+ std::size_t i;
+ RangeIterator iter;
+ bool operator != (const Iterator & other) const { return iter != other.iter; }
+ void operator ++ () { ++i; ++iter; }
+ auto operator * () const { return std::tie(i, *iter); }
+ };
+
+ struct Iteratable
+ {
+ Range iterable;
+ auto begin() { return Iterator{ 0, std::begin(iterable) }; }
+ auto end() { return Iterator{ 0, std::end(iterable) }; }
+ };
+
+ return Iteratable{ std::forward<Range>(iterable) };
+}
+
+} // end namespace Dumux
+
+#endif
--
GitLab