1 files changed, 37 insertions, 0 deletions
diff --git a/mojo/public/cpp/system/watcher.h b/mojo/public/cpp/system/watcher.h
new file mode 100644
index 0000000000..d0a257814d
--- /dev/null
+++ b/mojo/public/cpp/system/watcher.h
@@ -0,0 +1,37 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_
+#define MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_
+
+#include "mojo/public/c/system/types.h"
+#include "mojo/public/c/system/watcher.h"
+#include "mojo/public/cpp/system/handle.h"
+#include "mojo/public/cpp/system/system_export.h"
+
+namespace mojo {
+
+// A strongly-typed representation of a |MojoHandle| for a watcher.
+class WatcherHandle : public Handle {
+ public:
+  WatcherHandle() = default;
+  explicit WatcherHandle(MojoHandle value) : Handle(value) {}
+
+  // Copying and assignment allowed.
+};
+
+static_assert(sizeof(WatcherHandle) == sizeof(Handle),
+              "Bad size for C++ WatcherHandle");
+
+typedef ScopedHandleBase<WatcherHandle> ScopedWatcherHandle;
+static_assert(sizeof(ScopedWatcherHandle) == sizeof(WatcherHandle),
+              "Bad size for C++ ScopedWatcherHandle");
+
+MOJO_CPP_SYSTEM_EXPORT MojoResult
+CreateWatcher(MojoWatcherCallback callback,
+              ScopedWatcherHandle* watcher_handle);
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_SYSTEM_WATCHER_H_