Merge branch 'simplify-shared-any' into 'master'

Remove boost::any wrapper around std::shared_ptr

See merge request !28

src/graph/graph.hh

@@ -150,7 +150,7 @@ public:
 
     // Gets the encapsulated graph view. See graph_filtering.cc for details
     boost::any get_graph_view() const;
-    std::vector<boost::any>& get_graph_views() {return _graph_views;}
+    std::vector<std::shared_ptr<void>>& get_graph_views() {return _graph_views;}
 
 private:
 
@@ -168,7 +168,7 @@ private:
     edge_index_map_t _edge_index;
 
     // this will hold an instance of the graph views at run time
-    std::vector<boost::any> _graph_views;
+    std::vector<std::shared_ptr<void>> _graph_views;
 
     // reverse and directed states
     bool _reversed;

src/graph/graph_filtering.hh

@@ -524,17 +524,15 @@ retrieve_graph_view(GraphInterface& gi, Graph& init)
     auto& graph_views = gi.get_graph_views();
     if (index >= graph_views.size())
         graph_views.resize(index + 1);
-    boost::any& gview = graph_views[index];
-    std::shared_ptr<g_t>* gptr = boost::any_cast<std::shared_ptr<g_t>>(&gview);
-    if (gptr == 0)
+    std::shared_ptr<void>& gview = graph_views[index];
+    if (!gview)
     {
         std::shared_ptr<g_t> new_g =
             get_graph_ptr<g_t>(gi, init,
                                std::is_same<g_t, GraphInterface::multigraph_t>());
         gview = new_g;
-        return new_g;
     }
-    return *gptr;
+    return std::static_pointer_cast<g_t>(gview);
 }
 
 } //graph_tool namespace