chromium/base/supports_user_data.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_SUPPORTS_USER_DATA_H_
#define BASE_SUPPORTS_USER_DATA_H_

#include <map>
#include <memory>

#include "base/base_export.h"
#include "base/memory/scoped_refptr.h"
#include "base/sequence_checker.h"

namespace base {

// This is a helper for classes that want to allow users to stash random data by
// key. At destruction all the objects will be destructed.
class BASE_EXPORT SupportsUserData { … };

// Adapter class that releases a refcounted object when the
// SupportsUserData::Data object is deleted.
template <typename T>
class UserDataAdapter : public SupportsUserData::Data { … };

}  // namespace base

#endif  // BASE_SUPPORTS_USER_DATA_H_