add HandleToPropHandle metaprogram helper

src/OpenMesh/Core/Utils/HandleToPropHandle.hh

@@ -0,0 +1,40 @@
+#ifndef HANDLETOPROPHANDLE_HH_
+#define HANDLETOPROPHANDLE_HH_
+
+#include <OpenMesh/Core/Mesh/Handles.hh>
+#include <OpenMesh/Core/Utils/Property.hh>
+
+namespace OpenMesh {
+
+    template<typename ElementT, typename T>
+    struct HandleToPropHandle {
+    };
+
+    template<typename T>
+    struct HandleToPropHandle<OpenMesh::VertexHandle, T> {
+        using type = OpenMesh::VPropHandleT<T>;
+    };
+
+    template<typename T>
+    struct HandleToPropHandle<OpenMesh::HalfedgeHandle, T> {
+        using type = OpenMesh::HPropHandleT<T>;
+    };
+
+    template<typename T>
+    struct HandleToPropHandle<OpenMesh::EdgeHandle, T> {
+        using type = OpenMesh::EPropHandleT<T>;
+    };
+
+    template<typename T>
+    struct HandleToPropHandle<OpenMesh::FaceHandle, T> {
+        using type = OpenMesh::FPropHandleT<T>;
+    };
+
+    template<typename T>
+    struct HandleToPropHandle<void, T> {
+        using type = OpenMesh::MPropHandleT<T>;
+    };
+
+} // namespace OpenMesh
+
+#endif // HANDLETOPROPHANDLE_HH_