1 files changed, 49 insertions, 0 deletions
diff --git a/boost/geometry/util/for_each_with_index.hpp b/boost/geometry/util/for_each_with_index.hpp
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+++ b/boost/geometry/util/for_each_with_index.hpp
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+// Boost.Geometry
+
+// Copyright (c) 2023 Barend Gehrels, Amsterdam, the Netherlands.
+
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_UTIL_FOR_EACH_WITH_INDEX_HPP
+#define BOOST_GEOMETRY_UTIL_FOR_EACH_WITH_INDEX_HPP
+
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/size_type.hpp>
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail
+{
+
+// Utility function to implement a Kotlin like range based for loop
+template <typename Container, typename Function>
+inline void for_each_with_index(Container const& container, Function func)
+{
+    typename boost::range_size<Container>::type index = 0;
+    for (auto it = boost::begin(container); it != boost::end(container); ++it, ++index)
+    {
+        func(index, *it);
+    }
+}
+
+template <typename Container, typename Function>
+inline void for_each_with_index(Container& container, Function func)
+{
+    typename boost::range_size<Container>::type index = 0;
+    for (auto it = boost::begin(container); it != boost::end(container); ++it, ++index)
+    {
+        func(index, *it);
+    }
+}
+
+} // namespace detail
+#endif // DOXYGEN_NO_DETAIL
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_UTIL_FOR_EACH_WITH_INDEX_HPP