1 files changed, 56 insertions, 0 deletions
diff --git a/chrome/common/notification_details.h b/chrome/common/notification_details.h
new file mode 100644
index 0000000..92c1906
--- /dev/null
+++ b/chrome/common/notification_details.h
@@ -0,0 +1,56 @@
+// Copyright (c) 2006-2008 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.
+
+// This file defines the type used to provide details for NotificationService
+// notifications.
+
+#ifndef CHROME_COMMON_NOTIFICATION_DETAILS_H__
+#define CHROME_COMMON_NOTIFICATION_DETAILS_H__
+
+#include "base/basictypes.h"
+
+// Do not declare a NotificationDetails directly--use either
+// "Details<detailsclassname>(detailsclasspointer)" or
+// NotificationService::NoDetails().
+class NotificationDetails {
+ public:
+  NotificationDetails();
+  NotificationDetails(const NotificationDetails& other);
+  ~NotificationDetails();
+
+  // NotificationDetails can be used as the index for a map; this method
+  // returns the pointer to the current details as an identifier, for use as a
+  // map index.
+  uintptr_t map_key() const { return reinterpret_cast<uintptr_t>(ptr_); }
+
+  bool operator!=(const NotificationDetails& other) const {
+    return ptr_ != other.ptr_;
+  }
+
+  bool operator==(const NotificationDetails& other) const {
+    return ptr_ == other.ptr_;
+  }
+
+ protected:
+  explicit NotificationDetails(const void* ptr);
+
+  // Declaring this const allows Details<T> to be used with both T = Foo and
+  // T = const Foo.
+  const void* ptr_;
+};
+
+template <class T>
+class Details : public NotificationDetails {
+ public:
+  // TODO(erg): Our code hard relies on implicit conversion
+  Details(T* ptr) : NotificationDetails(ptr) {}  // NOLINT
+  Details(const NotificationDetails& other)      // NOLINT
+    : NotificationDetails(other) {}
+
+  T* operator->() const { return ptr(); }
+  // The casts here allow this to compile with both T = Foo and T = const Foo.
+  T* ptr() const { return static_cast<T*>(const_cast<void*>(ptr_)); }
+};
+
+#endif  // CHROME_COMMON_NOTIFICATION_DETAILS_H__