Issue 5163 - Reduce the use of FilterPtr

include/AdblockPlus/FilterEngine.h

 /*
  * 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 121 matching lines @@
      * Normally you shouldn't call this directly, but use
      * FilterEngine::GetSubscription() instead.
      * @param value JavaScript subscription object.
      */
     Subscription(JsValue&& value);
   };
 
   /**
    * Shared smart pointer to a `Filter` instance.
    */
-  typedef std::shared_ptr<Filter> FilterPtr;
+  typedef std::unique_ptr<Filter> FilterPtr;
 
   /**
    * Shared smart pointer to a `Subscription` instance.
    */
   typedef std::shared_ptr<Subscription> SubscriptionPtr;
 
   /**
    * Main component of libadblockplus.
    * It handles:
    * - Filter management and matching.
@@ skipping 125 matching lines @@
      * @return `true` if the application is running for the first time.
      */
     bool IsFirstRun() const;
 
     /**
      * Retrieves a filter object from its text representation.
      * @param text Text representation of the filter,
      *        see https://adblockplus.org/en/filters.
      * @return New `Filter` instance.
      */
-    FilterPtr GetFilter(const std::string& text) const;
+    Filter GetFilter(const std::string& text) const;
 
     /**
      * Retrieves a subscription object for the supplied URL.
      * @param url Subscription URL.
      * @return New `Subscription` instance.
      */
     SubscriptionPtr GetSubscription(const std::string& url) const;
 
     /**
      * Retrieves the list of custom filters.
      * @return List of custom filters.
      */
-    std::vector<FilterPtr> GetListedFilters() const;
+    std::vector<Filter> GetListedFilters() const;
 
     /**
      * Retrieves all subscriptions.
      * @return List of subscriptions.
      */
     std::vector<SubscriptionPtr> GetListedSubscriptions() const;
 
     /**
      * Retrieves all recommended subscriptions.
      * @return List of recommended subscriptions.
@@ skipping 230 matching lines @@
       const JsValueList& param) const;
     FilterPtr GetWhitelistingFilter(const std::string& url,
       ContentTypeMask contentTypeMask, const std::string& documentUrl) const;
     FilterPtr GetWhitelistingFilter(const std::string& url,
       ContentTypeMask contentTypeMask,
       const std::vector<std::string>& documentUrls) const;
   };
 }
 
 #endif