use C++11 type traits to reduce code size in integral->string conversion

Server/Http/Reply.cpp

@@ -38,7 +38,7 @@ void Reply::SetSize(const unsigned size)
     {
         if ("Content-Length" == h.name)
         {
-            h.value = UintToString(size);
+            h.value = IntegralToString(size);
         }
     }
 }
@@ -87,8 +87,7 @@ Reply Reply::StockReply(Reply::status_type status)
     const std::string status_string = reply.ToString(status);
     reply.content.insert(reply.content.end(), status_string.begin(), status_string.end());
     reply.headers.emplace_back("Access-Control-Allow-Origin", "*");
-    reply.headers.emplace_back("Content-Length",
-                               UintToString(static_cast<unsigned>(reply.content.size())));
+    reply.headers.emplace_back("Content-Length", IntegralToString(reply.content.size()));
     reply.headers.emplace_back("Content-Type", "text/html");
     return reply;
 }

Server/RequestHandler.cpp

@@ -92,7 +92,7 @@ void RequestHandler::handle_request(const http::Request &req, http::Reply &reply
             JSON::Object json_result;
             json_result.values["status"] = 400;
             std::string message = "Query string malformed close to position ";
-            message += UintToString(position);
+            message += IntegralToString(position);
             json_result.values["status_message"] = message;
             JSON::render(reply.content, json_result);
             return;
@@ -113,8 +113,7 @@ void RequestHandler::handle_request(const http::Request &req, http::Reply &reply
         }
 
         // set headers
-        reply.headers.emplace_back("Content-Length",
-                                   UintToString(static_cast<unsigned>(reply.content.size())));
+        reply.headers.emplace_back("Content-Length", IntegralToString(reply.content.size()));
         if ("gpx" == route_parameters.output_format)
         { // gpx file
             reply.headers.emplace_back("Content-Type", "application/gpx+xml; charset=UTF-8");

Server/Server.h

@@ -62,7 +62,7 @@ class Server
         : thread_pool_size(thread_pool_size), acceptor(io_service),
           new_connection(new http::Connection(io_service, request_handler)), request_handler()
     {
-        const std::string port_string = IntToString(port);
+        const std::string port_string = IntegralToString(port);
 
         boost::asio::ip::tcp::resolver resolver(io_service);
         boost::asio::ip::tcp::resolver::query query(address, port_string);
@@ -77,9 +77,6 @@ class Server
             boost::bind(&Server::HandleAccept, this, boost::asio::placeholders::error));
     }
 
-    // Server() = delete;
-    // Server(const Server &) = delete;
-
     void Run()
     {
         std::vector<std::shared_ptr<std::thread>> threads;