mesh copy

src/polymesh/copy.hh

+#pragma once
+
+#include "Mesh.hh"
+
+#include <tuple>
+
+namespace polymesh
+{
+/// copies a mesh and the given attributes (new versions are returned)
+///
+/// e.g.:
+///   auto [m2, pos2] = copy(m, pos);
+template <class... Attrs>
+std::tuple<unique_ptr<Mesh>, Attrs...> copy(Mesh const& m, Attrs const&... attrs)
+{
+    auto m2 = m.copy();
+    auto const& m2_ref = *m2;
+    return std::make_tuple(std::move(m2), attrs.copy_to(m2_ref)...);
+}
+}