Address some of the remaining issues of the code review

util/json_logger.hpp

@@ -1,6 +1,6 @@
 /*
 
-Copyright (c) 2015, Project OSRM, Dennis Luxen, others
+Copyright (c) 2015, Project OSRM contributors
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
@@ -37,6 +37,8 @@ namespace osrm
 namespace json
 {
 
+// Used to append additional debugging information to the JSON response in a
+// thread safe manner.
 class Logger
 {
     using MapT = std::unordered_map<std::string, osrm::json::Value>;
@@ -74,4 +76,4 @@ class Logger
 }
 }
 
-#endif /* SIMPLE_LOGGER_HPP */
+#endif /* JSON_LOGGER_HPP */

util/json_util.hpp

@@ -30,8 +30,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <osrm/json_container.hpp>
 
-#include <limits>
 #include <cmath>
+#include <limits>
 
 namespace osrm
 {
@@ -53,18 +53,10 @@ template <typename T> T clamp_float(T d)
     return d;
 }
 
-void append_to_array(osrm::json::Array &a) {}
-template <typename T, typename... Args>
-void append_to_array(osrm::json::Array &a, T value, Args... args)
-{
-    a.values.emplace_back(value);
-    append_to_array(a, args...);
-}
-
 template <typename... Args> osrm::json::Array make_array(Args... args)
 {
     osrm::json::Array a;
-    append_to_array(a, args...);
+    append_to_container(a.values, args...);
     return a;
 }