1 files changed, 79 insertions, 0 deletions
diff --git a/chrome/common/notification_source.h b/chrome/common/notification_source.h
new file mode 100644
index 0000000..31077e9
--- /dev/null
+++ b/chrome/common/notification_source.h
@@ -0,0 +1,79 @@
+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This file defines the type used to provide sources for NotificationService
+// notifications.
+
+#ifndef CHROME_COMMON_NOTIFICATION_SOURCE_H__
+#define CHROME_COMMON_NOTIFICATION_SOURCE_H__
+
+#include "base/basictypes.h"
+
+// Do not declare a NotificationSource directly--use either
+// "Source<sourceclassname>(sourceclasspointer)" or
+// NotificationService::AllSources().
+class NotificationSource {
+ public:
+  ~NotificationSource() {}
+
+  // NotificationSource can be used as the index for a map; this method
+  // returns the pointer to the current source as an identifier, for use as a
+  // map index.
+  uintptr_t map_key() const { return reinterpret_cast<uintptr_t>(ptr_); }
+
+  bool operator!=(const NotificationSource& other) const {
+    return ptr_ != other.ptr_;
+  }
+  bool operator==(const NotificationSource& other) const {
+    return ptr_ == other.ptr_;
+  }
+
+ protected:
+  NotificationSource(void* ptr) : ptr_(ptr) {}
+  NotificationSource(const NotificationSource& other) : ptr_(other.ptr_) { }
+
+  void* ptr_;
+
+ private:
+  void operator=(const NotificationSource&);
+};
+
+template <class T>
+class Source : public NotificationSource {
+ public:
+  Source(T* ptr) : NotificationSource(ptr) {}
+
+  Source(const NotificationSource& other)
+    : NotificationSource(other) {}
+
+  T* operator->() const { return ptr(); }
+  T* ptr() const { return static_cast<T*>(ptr_); }
+};
+
+#endif  // CHROME_COMMON_NOTIFICATION_SOURCE_H__