Use data sharing in RSS to save memory and increase performance

src/rss/rssarticle_p.h

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+/*
+ * Bittorrent Client using Qt4 and libtorrent.
+ * Copyright (C) 2010  Christophe Dumez, Arnaud Demaiziere
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * Contact: chris@qbittorrent.org, arnaud@qbittorrent.org
+ */
+
+#ifndef RSSARTICLE_P_H
+#define RSSARTICLE_P_H
+
+#include <QString>
+#include <QSharedData>
+#include <QDateTime>
+
+class RssFeed;
+
+class RssArticleData: public QSharedData {
+public:
+  RssArticleData(): QSharedData(), read(false) {}
+  ~RssArticleData() {}
+  RssArticleData(const RssArticleData& other):
+    QSharedData(other), parent(other.parent),
+    guid(other.guid), title(other.title), torrentUrl(other.torrentUrl),
+    link(other.link), description(other.description), date(other.date),
+    author(other.author), read(other.read) {}
+
+  RssFeed* parent;
+  QString guid;
+  QString title;
+  QString torrentUrl;
+  QString link;
+  QString description;
+  QDateTime date;
+  QString author;
+  bool read;
+};
+
+#endif // RSSARTICLE_P_H