Squashed 'OpenVPN Adapter/Vendors/openvpn/' content from commit da99df6

git-subtree-dir: OpenVPN Adapter/Vendors/openvpn
git-subtree-split: da99df69492256d7a18bbea303ae98457782a4bf

openvpn/reliable/relcommon.hpp

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+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Technologies, Inc.
+//
+//    This program 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.
+//
+//    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 in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+// Common reliability layer classes
+
+#ifndef OPENVPN_RELIABLE_RELCOMMON_H
+#define OPENVPN_RELIABLE_RELCOMMON_H
+
+#include <openvpn/crypto/packet_id.hpp>
+
+namespace openvpn {
+
+  namespace reliable {
+    typedef PacketID::id_t id_t;    
+  }
+
+  template <typename PACKET>
+  class ReliableMessageBase
+  {
+  public:
+    typedef reliable::id_t id_t;
+
+    ReliableMessageBase() : id_(0), erased_(false) {}
+    bool defined() const { return bool(packet); }
+    bool erased() const { return erased_; }
+
+    void erase()
+    {
+      id_ = id_t(0);
+      packet.reset();
+      erased_ = true;
+    }
+
+    id_t id() const { return id_; }
+
+    PACKET packet;
+
+  protected:
+    id_t id_;
+    bool erased_;
+  };
+
+} // namespace openvpn
+
+#endif // OPENVPN_RELIABLE_RELCOMMON_H