Use std::string_view for key type in json::Object (#7062)

src/benchmarks/json_render.cpp

@@ -9,12 +9,17 @@
 #include <rapidjson/document.h>
 #include <sstream>
 #include <stdexcept>
+#include <unordered_set>
 
 using namespace osrm;
 
 namespace
 {
 
+// we use std::string_view as a key in the object, so since here we have dynamic keys we have to
+// "hold" them somewhere okay for tests...
+static std::unordered_set<std::string> gKeysHolder;
+
 void convert(const rapidjson::Value &value, json::Value &result)
 {
     if (value.IsString())
@@ -32,7 +37,8 @@ void convert(const rapidjson::Value &value, json::Value &result)
         {
             json::Value member;
             convert(itr->value, member);
-            object.values.emplace(itr->name.GetString(), std::move(member));
+            auto keyItr = gKeysHolder.emplace(itr->name.GetString()).first;
+            object.values.emplace(*keyItr, std::move(member));
         }
         result = std::move(object);
     }
@@ -122,6 +128,7 @@ int main(int argc, char **argv)
 
     if (std::string{out_vec.begin(), out_vec.end()} != out_str || out_str != out_ss_str)
     {
+        std::cerr << "Vector/string results are not equal\n";
         throw std::logic_error("Vector/stringstream/string results are not equal");
     }
     return EXIT_SUCCESS;