Use nested namespace

It's a mechanical change to modernize the code base

include/engine/plugins/match.hpp

@@ -9,11 +9,7 @@
 
 #include <vector>
 
-namespace osrm
-{
-namespace engine
-{
-namespace plugins
+namespace osrm::engine::plugins
 {
 
 class MatchPlugin : public BasePlugin
@@ -38,8 +34,6 @@ class MatchPlugin : public BasePlugin
     const int max_locations_map_matching;
     const double max_radius_map_matching;
 };
-} // namespace plugins
-} // namespace engine
 } // namespace osrm
 
 #endif // MATCH_HPP

include/engine/plugins/nearest.hpp

@@ -7,11 +7,7 @@
 #include "engine/routing_algorithms.hpp"
 #include "osrm/json_container.hpp"
 
-namespace osrm
-{
-namespace engine
-{
-namespace plugins
+namespace osrm::engine::plugins
 {
 
 class NearestPlugin final : public BasePlugin
@@ -26,8 +22,6 @@ class NearestPlugin final : public BasePlugin
   private:
     const int max_results;
 };
-} // namespace plugins
-} // namespace engine
 } // namespace osrm
 
 #endif /* NEAREST_HPP */

include/engine/plugins/plugin_base.hpp

@@ -21,11 +21,7 @@
 
 #include <util/log.hpp>
 
-namespace osrm
-{
-namespace engine
-{
-namespace plugins
+namespace osrm::engine::plugins
 {
 
 class BasePlugin
@@ -325,8 +321,6 @@ class BasePlugin
                std::to_string(missing_index);
     }
 };
-} // namespace plugins
-} // namespace engine
 } // namespace osrm
 
 #endif /* BASE_PLUGIN_HPP */

include/engine/plugins/table.hpp

@@ -8,11 +8,7 @@
 
 #include "util/json_container.hpp"
 
-namespace osrm
-{
-namespace engine
-{
-namespace plugins
+namespace osrm::engine::plugins
 {
 
 class TablePlugin final : public BasePlugin
@@ -27,8 +23,6 @@ class TablePlugin final : public BasePlugin
   private:
     const int max_locations_distance_table;
 };
-} // namespace plugins
-} // namespace engine
 } // namespace osrm
 
 #endif // TABLE_HPP

include/engine/plugins/tile.hpp

@@ -16,11 +16,7 @@
  * OSRM is routing.  This is very useful for debugging routing
  * errors
  */
-namespace osrm
-{
-namespace engine
-{
-namespace plugins
+namespace osrm::engine::plugins
 {
 
 class TilePlugin final : public BasePlugin
@@ -30,8 +26,6 @@ class TilePlugin final : public BasePlugin
                          const api::TileParameters &parameters,
                          osrm::engine::api::ResultT &pbf_buffer) const;
 };
-} // namespace plugins
-} // namespace engine
 } // namespace osrm
 
 #endif /* TILEPLUGIN_HPP */

include/engine/plugins/trip.hpp

@@ -18,11 +18,7 @@
 #include <utility>
 #include <vector>
 
-namespace osrm
-{
-namespace engine
-{
-namespace plugins
+namespace osrm::engine::plugins
 {
 
 class TripPlugin final : public BasePlugin
@@ -42,8 +38,6 @@ class TripPlugin final : public BasePlugin
                          const api::TripParameters &parameters,
                          osrm::engine::api::ResultT &json_result) const;
 };
-} // namespace plugins
-} // namespace engine
 } // namespace osrm
 
 #endif // TRIP_HPP

include/engine/plugins/viaroute.hpp

@@ -15,11 +15,7 @@
 #include <string>
 #include <vector>
 
-namespace osrm
-{
-namespace engine
-{
-namespace plugins
+namespace osrm::engine::plugins
 {
 
 class ViaRoutePlugin final : public BasePlugin
@@ -35,8 +31,6 @@ class ViaRoutePlugin final : public BasePlugin
                          const api::RouteParameters &route_parameters,
                          osrm::engine::api::ResultT &json_result) const;
 };
-} // namespace plugins
-} // namespace engine
 } // namespace osrm
 
 #endif // VIA_ROUTE_HPP