Fix compilation error in action_wrap

src/graph/graph_filtering.hh

@@ -377,27 +377,43 @@ struct action_wrap
         : _a(a), _g(g), _max_v(max_v), _max_e(max_e) {}
 
     template <class Type>
-    auto
-    uncheck(boost::checked_vector_property_map<Type, GraphInterface::vertex_index_map_t> a,
-            boost::mpl::false_) const
+    boost::checked_vector_property_map<Type,GraphInterface::vertex_index_map_t>&
+    uncheck(boost::checked_vector_property_map
+            <Type,GraphInterface::vertex_index_map_t>& a, boost::mpl::true_) const
+    {
+        return a;
+    }
+
+    template <class Type>
+    boost::unchecked_vector_property_map<Type,GraphInterface::vertex_index_map_t>
+    uncheck(boost::checked_vector_property_map
+            <Type,GraphInterface::vertex_index_map_t> a, boost::mpl::false_) const
     {
         return a.get_unchecked(_max_v);
     }
 
     template <class Type>
-    auto
-    uncheck(boost::checked_vector_property_map<Type,GraphInterface::edge_index_map_t> a,
-            boost::mpl::false_) const
+    boost::checked_vector_property_map<Type,GraphInterface::edge_index_map_t>&
+    uncheck(boost::checked_vector_property_map
+            <Type,GraphInterface::edge_index_map_t>& a, boost::mpl::true_) const
+    {
+        return a;
+    }
+
+    template <class Type>
+    boost::unchecked_vector_property_map<Type,GraphInterface::edge_index_map_t>
+    uncheck(boost::checked_vector_property_map
+            <Type,GraphInterface::edge_index_map_t> a, boost::mpl::false_) const
     {
         return a.get_unchecked(_max_e);
     }
 
     template <class Type>
-    auto
+    scalarS<typename Type::unchecked_t>
     uncheck(scalarS<Type> a, boost::mpl::false_) const
     {
-        return scalarS<typename Type::unchecked_t>
-            (uncheck(a._pmap, boost::mpl::false_()));
+        return scalarS<typename Type::unchecked_t>(uncheck(a._pmap,
+                                                           boost::mpl::false_()));
     }
 
     //no op
@@ -405,6 +421,8 @@ struct action_wrap
     Type& uncheck(Type& a, DoWrap) const { return a; }
 
     void operator()() const {};
+    template <class T1> void operator()(T1* a1) const
+    { _a(*a1); }
 
     template <class T1, class... Ts>
     void operator()(T1* a1, Ts&&... as) const