util: Signal
Signal is an enhanced version of EventEmitter:
* only the owner can emit a signal (aka trigger an event)
* signal connection (aka event subscription) can be disconnected
EventEmitter is deprecated in favor of Signal.
refs #2279
Change-Id: I74ea5fef2e1e9b34776aa04f01170600b171152e
diff --git a/src/util/signal-scoped-connection.cpp b/src/util/signal-scoped-connection.cpp
new file mode 100644
index 0000000..ae90c5f
--- /dev/null
+++ b/src/util/signal-scoped-connection.cpp
@@ -0,0 +1,72 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "signal-scoped-connection.hpp"
+
+namespace ndn {
+namespace util {
+namespace signal {
+
+ScopedConnection::ScopedConnection()
+{
+}
+
+ScopedConnection::ScopedConnection(const Connection& connection)
+ : m_connection(connection)
+{
+}
+
+ScopedConnection::ScopedConnection(ScopedConnection&& other)
+ : m_connection(other.m_connection)
+{
+ other.release();
+}
+
+ScopedConnection&
+ScopedConnection::operator=(const Connection& connection)
+{
+ if (m_connection != connection) {
+ m_connection.disconnect();
+ m_connection = connection;
+ }
+ return *this;
+}
+
+ScopedConnection::~ScopedConnection()
+{
+ m_connection.disconnect();
+}
+
+void
+ScopedConnection::disconnect()
+{
+ m_connection.disconnect();
+}
+
+void
+ScopedConnection::release()
+{
+ m_connection = {};
+}
+
+} // namespace signal
+} // namespace util
+} // namespace ndn