Prepare ntcore for merge into allwpilib.

ntcore/src/main/native/cpp/IConnectionNotifier.h

@@ -0,0 +1,32 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2017-2018. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#ifndef NTCORE_ICONNECTIONNOTIFIER_H_
+#define NTCORE_ICONNECTIONNOTIFIER_H_
+
+#include <climits>
+
+#include "ntcore_cpp.h"
+
+namespace nt {
+
+class IConnectionNotifier {
+ public:
+  IConnectionNotifier() = default;
+  IConnectionNotifier(const IConnectionNotifier&) = delete;
+  IConnectionNotifier& operator=(const IConnectionNotifier&) = delete;
+  virtual ~IConnectionNotifier() = default;
+  virtual unsigned int Add(
+      std::function<void(const ConnectionNotification& event)> callback) = 0;
+  virtual unsigned int AddPolled(unsigned int poller_uid) = 0;
+  virtual void NotifyConnection(bool connected, const ConnectionInfo& conn_info,
+                                unsigned int only_listener = UINT_MAX) = 0;
+};
+
+}  // namespace nt
+
+#endif  // NTCORE_ICONNECTIONNOTIFIER_H_