Use nested namespace

It's a mechanical change to modernize the code base

include/updater/csv_file_parser.hpp

@@ -21,9 +21,7 @@
 #include <stdexcept>
 #include <vector>
 
-namespace osrm
-{
-namespace updater
+namespace osrm::updater
 {
 
 // Functor to parse a list of CSV files using "key,value,comment" grammar.
@@ -138,7 +136,6 @@ template <typename Key, typename Value> struct CSVFilesParser
     const KeyRule key_rule;
     const ValueRule value_rule;
 };
-} // namespace updater
 } // namespace osrm
 
 #endif

include/updater/csv_source.hpp

@@ -3,16 +3,10 @@
 
 #include "updater/source.hpp"
 
-namespace osrm
-{
-namespace updater
-{
-namespace csv
+namespace osrm::updater::csv
 {
 SegmentLookupTable readSegmentValues(const std::vector<std::string> &paths);
 TurnLookupTable readTurnValues(const std::vector<std::string> &paths);
-} // namespace csv
-} // namespace updater
 } // namespace osrm
 
 #endif

include/updater/source.hpp

@@ -7,9 +7,7 @@
 
 #include <vector>
 
-namespace osrm
-{
-namespace updater
+namespace osrm::updater
 {
 
 template <typename Key, typename Value> struct LookupTable
@@ -88,7 +86,6 @@ struct PenaltySource final
 
 using SegmentLookupTable = LookupTable<Segment, SpeedSource>;
 using TurnLookupTable = LookupTable<Turn, PenaltySource>;
-} // namespace updater
 } // namespace osrm
 
 #endif

include/updater/updater.hpp

@@ -8,9 +8,7 @@
 #include <chrono>
 #include <vector>
 
-namespace osrm
-{
-namespace updater
+namespace osrm::updater
 {
 class Updater
 {
@@ -37,7 +35,6 @@ class Updater
   private:
     UpdaterConfig config;
 };
-} // namespace updater
 } // namespace osrm
 
 #endif

include/updater/updater_config.hpp

@@ -36,9 +36,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "storage/io_config.hpp"
 #include "storage/storage_config.hpp"
 
-namespace osrm
-{
-namespace updater
+namespace osrm::updater
 {
 
 struct UpdaterConfig final : storage::IOConfig
@@ -73,7 +71,6 @@ struct UpdaterConfig final : storage::IOConfig
     std::vector<std::string> turn_penalty_lookup_paths;
     std::string tz_file_path;
 };
-} // namespace updater
 } // namespace osrm
 
 #endif // EXTRACTOR_OPTIONS_HPP