Use nested namespace

It's a mechanical change to modernize the code base

include/engine/datafacade/algorithm_datafacade.hpp

@@ -12,11 +12,7 @@
 #include "util/filtered_graph.hpp"
 #include "util/integer_range.hpp"
 
-namespace osrm
-{
-namespace engine
-{
-namespace datafacade
+namespace osrm::engine::datafacade
 {
 
 // Namespace local aliases for algorithms
@@ -109,8 +105,6 @@ template <> class AlgorithmDataFacade<MLD>
     virtual EdgeID FindEdge(const NodeID edge_based_node_from,
                             const NodeID edge_based_node_to) const = 0;
 };
-} // namespace datafacade
-} // namespace engine
 } // namespace osrm
 
 #endif

include/engine/datafacade/contiguous_block_allocator.hpp

@@ -3,11 +3,7 @@
 
 #include "storage/shared_data_index.hpp"
 
-namespace osrm
-{
-namespace engine
-{
-namespace datafacade
+namespace osrm::engine::datafacade
 {
 
 class ContiguousBlockAllocator
@@ -19,8 +15,6 @@ class ContiguousBlockAllocator
     virtual const storage::SharedDataIndex &GetIndex() = 0;
 };
 
-} // namespace datafacade
-} // namespace engine
 } // namespace osrm
 
 #endif // OSRM_ENGINE_DATAFACADE_CONTIGUOUS_BLOCK_ALLOCATOR_HPP_

include/engine/datafacade/contiguous_internalmem_datafacade.hpp

@@ -28,11 +28,7 @@
 #include <utility>
 #include <vector>
 
-namespace osrm
-{
-namespace engine
-{
-namespace datafacade
+namespace osrm::engine::datafacade
 {
 
 template <typename AlgorithmT> class ContiguousInternalMemoryAlgorithmDataFacade;
@@ -693,8 +689,6 @@ class ContiguousInternalMemoryDataFacade<MLD> final
     {
     }
 };
-} // namespace datafacade
-} // namespace engine
 } // namespace osrm
 
 #endif // CONTIGUOUS_INTERNALMEM_DATAFACADE_HPP

include/engine/datafacade/datafacade_base.hpp

@@ -40,11 +40,7 @@
 #include <utility>
 #include <vector>
 
-namespace osrm
-{
-namespace engine
-{
-namespace datafacade
+namespace osrm::engine::datafacade
 {
 
 class BaseDataFacade
@@ -189,8 +185,6 @@ class BaseDataFacade
     virtual std::vector<extractor::ManeuverOverride>
     GetOverridesThatStartAt(const NodeID edge_based_node_id) const = 0;
 };
-} // namespace datafacade
-} // namespace engine
 } // namespace osrm
 
 #endif // DATAFACADE_BASE_HPP

include/engine/datafacade/mmap_memory_allocator.hpp

@@ -12,11 +12,7 @@
 #include <memory>
 #include <string>
 
-namespace osrm
-{
-namespace engine
-{
-namespace datafacade
+namespace osrm::engine::datafacade
 {
 
 /**
@@ -37,8 +33,6 @@ class MMapMemoryAllocator final : public ContiguousBlockAllocator
     std::string rtree_filename;
 };
 
-} // namespace datafacade
-} // namespace engine
 } // namespace osrm
 
 #endif // OSRM_ENGINE_DATAFACADE_SHARED_MEMORY_ALLOCATOR_HPP_

include/engine/datafacade/process_memory_allocator.hpp

@@ -6,11 +6,7 @@
 
 #include <memory>
 
-namespace osrm
-{
-namespace engine
-{
-namespace datafacade
+namespace osrm::engine::datafacade
 {
 
 /**
@@ -34,8 +30,6 @@ class ProcessMemoryAllocator final : public ContiguousBlockAllocator
     std::unique_ptr<char[]> internal_memory;
 };
 
-} // namespace datafacade
-} // namespace engine
 } // namespace osrm
 
 #endif // OSRM_ENGINE_DATAFACADE_PROCESS_MEMORY_ALLOCATOR_HPP_

include/engine/datafacade/shared_memory_allocator.hpp

@@ -8,11 +8,7 @@
 
 #include <memory>
 
-namespace osrm
-{
-namespace engine
-{
-namespace datafacade
+namespace osrm::engine::datafacade
 {
 
 /**
@@ -35,8 +31,6 @@ class SharedMemoryAllocator final : public ContiguousBlockAllocator
     std::vector<std::unique_ptr<storage::SharedMemory>> memory_regions;
 };
 
-} // namespace datafacade
-} // namespace engine
 } // namespace osrm
 
 #endif // OSRM_ENGINE_DATAFACADE_SHARED_MEMORY_ALLOCATOR_HPP_