ipc/chromium/src/chrome/common/notification_source.h

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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // This file defines the type used to provide sources for NotificationService
6 // notifications.
7
8 #ifndef CHROME_COMMON_NOTIFICATION_SOURCE_H__
9 #define CHROME_COMMON_NOTIFICATION_SOURCE_H__
10
11 #include "base/basictypes.h"
12
13 // Do not declare a NotificationSource directly--use either
14 // "Source<sourceclassname>(sourceclasspointer)" or
15 // NotificationService::AllSources().
16 class NotificationSource {
17 public:
18 NotificationSource(const NotificationSource& other) : ptr_(other.ptr_) { }
19 ~NotificationSource() {}
20
21 // NotificationSource can be used as the index for a map; this method
22 // returns the pointer to the current source as an identifier, for use as a
23 // map index.
24 uintptr_t map_key() const { return reinterpret_cast<uintptr_t>(ptr_); }
25
26 bool operator!=(const NotificationSource& other) const {
27 return ptr_ != other.ptr_;
28 }
29 bool operator==(const NotificationSource& other) const {
30 return ptr_ == other.ptr_;
31 }
32
33 protected:
34 NotificationSource(void* ptr) : ptr_(ptr) {}
35
36 void* ptr_;
37 };
38
39 template <class T>
40 class Source : public NotificationSource {
41 public:
42 Source(T* ptr) : NotificationSource(ptr) {}
43
44 Source(const NotificationSource& other)
45 : NotificationSource(other) {}
46
47 T* operator->() const { return ptr(); }
48 T* ptr() const { return static_cast<T*>(ptr_); }
49 };
50
51 #endif // CHROME_COMMON_NOTIFICATION_SOURCE_H__

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