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// 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 sources for NotificationService
// notifications.
#ifndef CHROME_COMMON_NOTIFICATION_SOURCE_H__
#define CHROME_COMMON_NOTIFICATION_SOURCE_H__
#pragma once
#include "base/basictypes.h"
// Do not declare a NotificationSource directly--use either
// "Source<sourceclassname>(sourceclasspointer)" or
// NotificationService::AllSources().
class NotificationSource {
public:
NotificationSource(const NotificationSource& other);
~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:
explicit NotificationSource(const void* ptr);
// Declaring this const allows Source<T> to be used with both T = Foo and
// T = const Foo.
const void* ptr_;
};
template <class T>
class Source : public NotificationSource {
public:
// TODO(erg): Our code hard relies on implicit conversion
Source(const T* ptr) : NotificationSource(ptr) {} // NOLINT
Source(const NotificationSource& other) // NOLINT
: NotificationSource(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_SOURCE_H__
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