Issue 5450 - don't expose std::shared_ptr<FilterEngine>

shell/src/Main.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 48 matching lines @@
     AdblockPlus::AppInfo appInfo;
     appInfo.version = "1.0";
     appInfo.name = "abpshell";
     appInfo.application = "standalone";
     appInfo.applicationVersion = "1.0";
     appInfo.locale = "en-US";
 
     AdblockPlus::Platform platform;
     platform.SetUpJsEngine(appInfo);
     AdblockPlus::JsEngine& jsEngine = platform.GetJsEngine();
-    auto filterEngine = platform.GetFilterEngine();
+    auto& filterEngine = platform.GetFilterEngine();
 
     CommandMap commands;
     Add(commands, new GcCommand(jsEngine));
     Add(commands, new HelpCommand(commands));
-    Add(commands, new FiltersCommand(*filterEngine));
-    Add(commands, new SubscriptionsCommand(*filterEngine));
-    Add(commands, new MatchesCommand(*filterEngine));
-    Add(commands, new PrefsCommand(*filterEngine));
+    Add(commands, new FiltersCommand(filterEngine));
+    Add(commands, new SubscriptionsCommand(filterEngine));
+    Add(commands, new MatchesCommand(filterEngine));
+    Add(commands, new PrefsCommand(filterEngine));
 
     std::string commandLine;
     while (ReadCommandLine(commandLine))
     {
       std::string commandName;
       std::string arguments;
       ParseCommandLine(commandLine, commandName, arguments);
       const CommandMap::const_iterator it = commands.find(commandName);
       try
       {
         if (it != commands.end())
           (*it->second)(arguments);
         else
           throw NoSuchCommandError(commandName);
       }
       catch (NoSuchCommandError error)
       {
         std::cout << error.what() << std::endl;
       }
     }
   }
   catch (const std::exception& e)
   {
     std::cerr << "Exception: " << e.what() << std::endl;
   }
   return 0;
 }