Replace optional<EdgeWeight> with constant value

include/extractor/compressed_edge_container.hpp

@@ -10,8 +10,6 @@
 #include <string>
 #include <vector>
 
-#include <boost/optional.hpp>
-
 namespace osrm
 {
 namespace extractor
@@ -41,8 +39,8 @@ class CompressedEdgeContainer
                       const EdgeDuration duration2,
                       // node-penalties can be added before/or after the traversal of an edge which
                       // depends on whether we traverse the link forwards or backwards.
-                      const boost::optional<EdgeWeight> node_weight_penalty = boost::none,
-                      const boost::optional<EdgeDuration> node_duration_penalty = boost::none);
+                      const EdgeWeight node_weight_penalty = INVALID_EDGE_WEIGHT,
+                      const EdgeDuration node_duration_penalty = MAXIMAL_EDGE_DURATION);
 
     void AddUncompressedEdge(const EdgeID edge_id,
                              const NodeID target_node,