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--- lib/core/include/Graph.h.orig	2017-03-28 03:30:14.000000000 -0600
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+++ lib/core/include/Graph.h	2017-03-28 21:33:36.040286583 -0600
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@@ -709,8 +709,8 @@ public:
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    void swap(Table& t)
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    {
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       std::swap(R,t.R);
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-      std::swap(node_maps, t.node_maps);
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-      std::swap(edge_maps, t.edge_maps);
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+      node_maps.swap(t.node_maps);
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+      edge_maps.swap(t.edge_maps);
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       std::swap(n_nodes, t.n_nodes);
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       std::swap(free_node_id, t.free_node_id);
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       std::swap(free_edge_ids, t.free_edge_ids);