From 42363c4f91753036de1198d29d142c11571f37d8 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 5 Apr 2025 00:00:34 +0100
Subject: Add OpenMesh/range helpers which support OpenMesh11

Exactly which version introduces the new types, not sure... Easy to
change the version check macro though.
---
 thirdparty/openmesh/helpers.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/thirdparty/openmesh/helpers.h b/thirdparty/openmesh/helpers.h
index a0105c8..0e29261 100644
--- a/thirdparty/openmesh/helpers.h
+++ b/thirdparty/openmesh/helpers.h
@@ -7,6 +7,7 @@ namespace OpenMesh {
 	template<typename Iter, typename... IterParams>
 	using IteratorFunction = Iter (OpenMesh::PolyConnectivity::*)(IterParams...) const;
 
+#if OM_GET_VER < 8
 	template<typename Iter, typename CenterEntityHandle, IteratorFunction<Iter, CenterEntityHandle> BeginFunc,
 			IteratorFunction<Iter, CenterEntityHandle> EndFunc, typename Adaptor>
 	auto
@@ -26,6 +27,27 @@ namespace OpenMesh {
 	{
 		return std::views::iota(range.begin(), range.end()) | std::forward<Adaptor>(adaptor);
 	}
+#else
+	template<typename Iter, typename CenterEntityHandle, typename ToEntityHandle,
+			IteratorFunction<Iter, CenterEntityHandle> BeginFunc, IteratorFunction<Iter, CenterEntityHandle> EndFunc,
+			typename Adaptor>
+	auto
+	operator|(const CirculatorRange<CirculatorRangeTraitT<OpenMesh::PolyConnectivity, Iter, CenterEntityHandle,
+					  ToEntityHandle, BeginFunc, EndFunc>> & range,
+			Adaptor && adaptor)
+	{
+		return std::views::iota(range.begin(), range.end()) | std::forward<Adaptor>(adaptor);
+	}
+
+	template<typename Iter, IteratorFunction<Iter> BeginFunc, IteratorFunction<Iter> EndFunc, typename Adaptor>
+	auto
+	operator|(const EntityRange<RangeTraitT<const OpenMesh::PolyConnectivity, Iter, BeginFunc, EndFunc>> & range,
+			Adaptor && adaptor)
+	{
+		return std::views::iota(range.begin(), range.end()) | std::forward<Adaptor>(adaptor);
+	}
+
+#endif
 
 	namespace Helpers {
 		template<typename Type, template<typename> typename PropertyT> struct Property : public PropertyT<Type> {
-- 
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