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

src/osrm/osrm.cpp

@@ -65,7 +65,7 @@ Status OSRM::Route(const engine::api::RouteParameters &params, json::Object &jso
 {
     osrm::engine::api::ResultT result = json::Object();
     auto status = engine_->Route(params, result);
-    json_result = std::move(result.get<json::Object>());
+    json_result = std::move(std::get<json::Object>(result));
     return status;
 }
 
@@ -78,7 +78,7 @@ Status OSRM::Table(const engine::api::TableParameters &params, json::Object &jso
 {
     osrm::engine::api::ResultT result = json::Object();
     auto status = engine_->Table(params, result);
-    json_result = std::move(result.get<json::Object>());
+    json_result = std::move(std::get<json::Object>(result));
     return status;
 }
 
@@ -91,7 +91,7 @@ Status OSRM::Nearest(const engine::api::NearestParameters &params, json::Object
 {
     osrm::engine::api::ResultT result = json::Object();
     auto status = engine_->Nearest(params, result);
-    json_result = std::move(result.get<json::Object>());
+    json_result = std::move(std::get<json::Object>(result));
     return status;
 }
 
@@ -104,7 +104,7 @@ Status OSRM::Trip(const engine::api::TripParameters &params, json::Object &json_
 {
     osrm::engine::api::ResultT result = json::Object();
     auto status = engine_->Trip(params, result);
-    json_result = std::move(result.get<json::Object>());
+    json_result = std::move(std::get<json::Object>(result));
     return status;
 }
 
@@ -118,7 +118,7 @@ Status OSRM::Match(const engine::api::MatchParameters &params, json::Object &jso
 {
     osrm::engine::api::ResultT result = json::Object();
     auto status = engine_->Match(params, result);
-    json_result = std::move(result.get<json::Object>());
+    json_result = std::move(std::get<json::Object>(result));
     return status;
 }
 
@@ -131,7 +131,7 @@ Status OSRM::Tile(const engine::api::TileParameters &params, std::string &str_re
 {
     osrm::engine::api::ResultT result = std::string();
     auto status = engine_->Tile(params, result);
-    str_result = std::move(result.get<std::string>());
+    str_result = std::move(std::get<std::string>(result));
     return status;
 }