Use nested namespace

It's a mechanical change to modernize the code base

include/extractor/intersection/constants.hpp

@@ -1,11 +1,7 @@
 #ifndef OSRM_EXTRACTOR_INTERSECTION_CONSTANTS_HPP_
 #define OSRM_EXTRACTOR_INTERSECTION_CONSTANTS_HPP_
 
-namespace osrm
-{
-namespace extractor
-{
-namespace intersection
+namespace osrm::extractor::intersection
 {
 
 // what angle is interpreted as going straight
@@ -30,8 +26,6 @@ const auto constexpr ASSUMED_LANE_WIDTH = 3.25;
 // how far apart can roads be at the most, when thinking about merging them?
 const auto constexpr MERGABLE_ANGLE_DIFFERENCE = 95.0;
 
-} // namespace intersection
-} // namespace extractor
 } // namespace osrm
 
 #endif // OSRM_EXTRACTOR_INTERSECTION_CONSTANTS_HPP_

include/extractor/intersection/coordinate_extractor.hpp

@@ -11,11 +11,7 @@
 #include "util/coordinate.hpp"
 #include "util/node_based_graph.hpp"
 
-namespace osrm
-{
-namespace extractor
-{
-namespace intersection
+namespace osrm::extractor::intersection
 {
 
 class CoordinateExtractor
@@ -251,8 +247,6 @@ class CoordinateExtractor
                         const std::uint8_t considered_lanes) const;
 };
 
-} // namespace intersection
-} // namespace extractor
 } // namespace osrm
 
 #endif // OSRM_EXTRACTOR_INTERSECTION_COORDINATE_EXTRACTOR_HPP_

include/extractor/intersection/have_identical_names.hpp

@@ -5,11 +5,7 @@
 #include "extractor/suffix_table.hpp"
 #include "guidance/constants.hpp"
 
-namespace osrm
-{
-namespace extractor
-{
-namespace intersection
+namespace osrm::extractor::intersection
 {
 
 // check if two name ids can be seen as identical (in presence of refs/others)
@@ -20,8 +16,6 @@ bool HaveIdenticalNames(const NameID lhs,
                         const NameTable &name_table,
                         const SuffixTable &street_name_suffix_table);
 
-} // namespace intersection
-} // namespace extractor
 } // namespace osrm
 
 #endif /*OSRM_EXTRACTOR_INTERSECTION_HAVE_IDENTICAL_NAMES_HPP_*/

include/extractor/intersection/intersection_analysis.hpp

@@ -14,11 +14,7 @@
 #include <unordered_set>
 #include <vector>
 
-namespace osrm
-{
-namespace extractor
-{
-namespace intersection
+namespace osrm::extractor::intersection
 {
 
 IntersectionEdges getIncomingEdges(const util::NodeBasedDynamicGraph &graph,
@@ -89,8 +85,6 @@ getConnectedRoadsForEdgeGeometries(const util::NodeBasedDynamicGraph &graph,
 // for getConnectedRoads.
 IntersectionEdge skipDegreeTwoNodes(const util::NodeBasedDynamicGraph &graph,
                                     IntersectionEdge road);
-} // namespace intersection
-} // namespace extractor
 } // namespace osrm
 
 #endif

include/extractor/intersection/intersection_edge.hpp

@@ -5,11 +5,7 @@
 
 #include <vector>
 
-namespace osrm
-{
-namespace extractor
-{
-namespace intersection
+namespace osrm::extractor::intersection
 {
 
 // IntersectionEdge is an alias for incoming and outgoing node-based graph edges of an intersection
@@ -42,8 +38,6 @@ struct IntersectionEdgeGeometry
 };
 
 using IntersectionEdgeGeometries = std::vector<IntersectionEdgeGeometry>;
-} // namespace intersection
-} // namespace extractor
 } // namespace osrm
 
 #endif

include/extractor/intersection/intersection_view.hpp

@@ -21,11 +21,7 @@
 #include <type_traits>
 #include <vector>
 
-namespace osrm
-{
-namespace extractor
-{
-namespace intersection
+namespace osrm::extractor::intersection
 {
 
 inline auto makeCompareAngularDeviation(const double angle)
@@ -232,8 +228,6 @@ struct IntersectionView final : std::vector<IntersectionViewData>,      //
     using Base = std::vector<IntersectionViewData>;
 };
 
-} // namespace intersection
-} // namespace extractor
 } // namespace osrm
 
 #endif /* OSRM_EXTRACTOR_INTERSECTION_INTERSECTION_VIEW_HPP_*/

include/extractor/intersection/node_based_graph_walker.hpp

@@ -15,11 +15,7 @@
 #include <cstdint>
 #include <utility>
 
-namespace osrm
-{
-namespace extractor
-{
-namespace intersection
+namespace osrm::extractor::intersection
 {
 
 /*
@@ -311,8 +307,6 @@ struct DistanceToNextIntersectionAccumulator
     double distance = 0.;
 };
 
-} // namespace intersection
-} // namespace extractor
 } // namespace osrm
 
 #endif