split algorithms in different plugins for better evaluation

split tsp brute force algorithm for better testing

refactor and clean up

library/osrm_impl.cpp

@@ -42,6 +42,9 @@ class named_mutex;
 #include "../plugins/nearest.hpp"
 #include "../plugins/timestamp.hpp"
 #include "../plugins/round_trip.hpp"
+#include "../plugins/round_trip_NN.hpp"
+#include "../plugins/round_trip_BF.hpp"
+#include "../plugins/round_trip_FI.hpp"
 #include "../plugins/viaroute.hpp"
 #include "../plugins/match.hpp"
 #include "../server/data_structures/datafacade_base.hpp"
@@ -88,6 +91,9 @@ OSRM_impl::OSRM_impl(libosrm_config &lib_config)
     RegisterPlugin(new TimestampPlugin<BaseDataFacade<QueryEdge::EdgeData>>(query_data_facade));
     RegisterPlugin(new ViaRoutePlugin<BaseDataFacade<QueryEdge::EdgeData>>(query_data_facade));
     RegisterPlugin(new RoundTripPlugin<BaseDataFacade<QueryEdge::EdgeData>>(query_data_facade));
+    RegisterPlugin(new RoundTripPluginNN<BaseDataFacade<QueryEdge::EdgeData>>(query_data_facade));
+    RegisterPlugin(new RoundTripPluginBF<BaseDataFacade<QueryEdge::EdgeData>>(query_data_facade));
+    RegisterPlugin(new RoundTripPluginFI<BaseDataFacade<QueryEdge::EdgeData>>(query_data_facade));
 }
 
 OSRM_impl::~OSRM_impl()

library/osrm_impl.hpp

@@ -28,6 +28,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifndef OSRM_IMPL_HPP
 #define OSRM_IMPL_HPP
 
+// #if __cplusplus > 199711L
+// #define register      // Deprecated in C++11.
+// #endif  // #if __cplusplus > 199711L
+
 class BasePlugin;
 struct RouteParameters;