blob: 235586abdf3a18a1d8a59b212b201f55a14eb934 [file] [log] [blame]
// Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_NOTIFICATION_DETAILS_H_
#define CONTENT_PUBLIC_BROWSER_NOTIFICATION_DETAILS_H_
#include "base/basictypes.h"
#include "content/common/content_export.h"
namespace content {
// Do not declare a NotificationDetails directly--use either
// "Details<detailsclassname>(detailsclasspointer)" or
// NotificationService::NoDetails().
class CONTENT_EXPORT NotificationDetails {
public:
NotificationDetails() : ptr_(nullptr) {}
NotificationDetails(const NotificationDetails& other) : ptr_(other.ptr_) {}
~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) : ptr_(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_)); }
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_NOTIFICATION_DETAILS_H_