Add type traits to disable plugins for specific algorithms

include/engine/routing_algorithms/alternative_path.hpp

@@ -7,6 +7,8 @@
 #include "engine/algorithm.hpp"
 #include "engine/search_engine_data.hpp"
 
+#include "util/exception.hpp"
+
 namespace osrm
 {
 namespace engine
@@ -14,6 +16,16 @@ namespace engine
 namespace routing_algorithms
 {
 
+template <typename AlgorithmT>
+InternalRouteResult
+alternativePathSearch(SearchEngineData &,
+                      const datafacade::ContiguousInternalMemoryDataFacade<AlgorithmT> &,
+                      const PhantomNodes &)
+{
+    throw util::exception(std::string("alternativePathSearch is not implemented for ") +
+                          typeid(AlgorithmT).name());
+}
+
 InternalRouteResult
 alternativePathSearch(SearchEngineData &search_engine_data,
                       const datafacade::ContiguousInternalMemoryDataFacade<algorithm::CH> &facade,