Use std::variant instead of mapbox::util::variant (#6903)

include/util/geojson_debug_logger.hpp

@@ -51,7 +51,7 @@ class GeojsonLogger
             if (!first)
                 ofs << ",\n\t\t";
 
-            util::json::render(ofs, object.get<util::json::Object>());
+            util::json::render(ofs, std::get<util::json::Object>(object));
 
             first = false;
         }

include/util/geojson_debug_policies.hpp

@@ -51,4 +51,4 @@ struct CoordinateVectorToMultiPoint
 
 } // namespace osrm::util
 
-#endif /* OSRM_GEOJSON_DEBUG_POLICIES */
+#endif /* OSRM_GEOJSON_DEBUG_POLICIES */

include/util/geojson_debug_policy_toolkit.hpp

@@ -55,12 +55,12 @@ inline util::json::Object makeStyle(const GeojsonStyleSize size_type,
 
 struct CoordinateToJsonArray
 {
-    util::json::Array operator()(const util::Coordinate coordinate)
+    util::json::Value operator()(const util::Coordinate coordinate)
     {
         util::json::Array json_coordinate;
         json_coordinate.values.push_back(static_cast<double>(toFloating(coordinate.lon)));
         json_coordinate.values.push_back(static_cast<double>(toFloating(coordinate.lat)));
-        return json_coordinate;
+        return util::json::Value{json_coordinate};
     }
 };
 
@@ -73,7 +73,7 @@ struct NodeIdToCoordinate
 
     const std::vector<util::Coordinate> &node_coordinates;
 
-    util::json::Array operator()(const NodeID nid)
+    util::json::Value operator()(const NodeID nid)
     {
         auto coordinate = node_coordinates[nid];
         CoordinateToJsonArray converter;
@@ -108,4 +108,4 @@ inline util::json::Array makeJsonArray(const std::vector<util::Coordinate> &inpu
 }
 } // namespace osrm::util
 
-#endif /* OSRM_GEOJSON_DEBUG_POLICY_TOOLKIT_HPP */
+#endif /* OSRM_GEOJSON_DEBUG_POLICY_TOOLKIT_HPP */

include/util/json_container.hpp

@@ -31,11 +31,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifndef JSON_CONTAINER_HPP
 #define JSON_CONTAINER_HPP
 
-#include <mapbox/variant.hpp>
-
 #include <string>
 #include <unordered_map>
 #include <utility>
+#include <variant>
 #include <vector>
 
 namespace osrm::util::json
@@ -96,13 +95,7 @@ struct Null
  *
  * Dispatch on its type by either by using apply_visitor or its get function.
  */
-using Value = mapbox::util::variant<String,
-                                    Number,
-                                    mapbox::util::recursive_wrapper<Object>,
-                                    mapbox::util::recursive_wrapper<Array>,
-                                    True,
-                                    False,
-                                    Null>;
+using Value = std::variant<String, Number, Object, Array, True, False, Null>;
 
 /**
  * Typed Object.

include/util/json_deep_compare.hpp

@@ -81,10 +81,10 @@ struct Comparator
 
             const auto &rhs_child = rhs.values.find(key)->second;
             const auto &lhs_child = lhs.values.find(key)->second;
-            auto is_same = mapbox::util::apply_visitor(
-                Comparator(reason, lhs_path + "." + key, rhs_path + "." + key),
-                lhs_child,
-                rhs_child);
+            auto is_same =
+                std::visit(Comparator(reason, lhs_path + "." + key, rhs_path + "." + key),
+                           lhs_child,
+                           rhs_child);
             if (!is_same)
             {
                 return false;
@@ -104,12 +104,11 @@ struct Comparator
 
         for (auto i = 0UL; i < lhs.values.size(); ++i)
         {
-            auto is_same =
-                mapbox::util::apply_visitor(Comparator(reason,
-                                                       lhs_path + "[" + std::to_string(i) + "]",
-                                                       rhs_path + "[" + std::to_string(i) + "]"),
-                                            lhs.values[i],
-                                            rhs.values[i]);
+            auto is_same = std::visit(Comparator(reason,
+                                                 lhs_path + "[" + std::to_string(i) + "]",
+                                                 rhs_path + "[" + std::to_string(i) + "]"),
+                                      lhs.values[i],
+                                      rhs.values[i]);
             if (!is_same)
             {
                 return false;
@@ -151,8 +150,7 @@ struct Comparator
 
 inline bool compare(const Value &reference, const Value &result, std::string &reason)
 {
-    return mapbox::util::apply_visitor(
-        Comparator(reason, "reference", "result"), reference, result);
+    return std::visit(Comparator(reason, "reference", "result"), reference, result);
 }
 } // namespace osrm::util::json
 

include/util/json_renderer.hpp

@@ -67,7 +67,7 @@ template <typename Out> struct Renderer
             write('\"');
             write(it->first);
             write<>("\":");
-            mapbox::util::apply_visitor(Renderer(out), it->second);
+            std::visit(Renderer(out), it->second);
             if (++it != end)
             {
                 write(',');
@@ -81,7 +81,7 @@ template <typename Out> struct Renderer
         write('[');
         for (auto it = array.values.cbegin(), end = array.values.cend(); it != end;)
         {
-            mapbox::util::apply_visitor(Renderer(out), *it);
+            std::visit(Renderer(out), *it);
             if (++it != end)
             {
                 write(',');