1 // Copyright (c) 2012 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 #include "base/supports_user_data.h" 6 7 namespace base { 8 9 SupportsUserData::SupportsUserData() { 10 // Harmless to construct on a different thread to subsequent usage. 11 thread_checker_.DetachFromThread(); 12 } 13 14 SupportsUserData::Data* SupportsUserData::GetUserData(const void* key) const { 15 DCHECK(thread_checker_.CalledOnValidThread()); 16 DataMap::const_iterator found = user_data_.find(key); 17 if (found != user_data_.end()) 18 return found->second.get(); 19 return NULL; 20 } 21 22 void SupportsUserData::SetUserData(const void* key, Data* data) { 23 DCHECK(thread_checker_.CalledOnValidThread()); 24 user_data_[key] = linked_ptr<Data>(data); 25 } 26 27 void SupportsUserData::RemoveUserData(const void* key) { 28 DCHECK(thread_checker_.CalledOnValidThread()); 29 user_data_.erase(key); 30 } 31 32 void SupportsUserData::DetachUserDataThread() { 33 thread_checker_.DetachFromThread(); 34 } 35 36 SupportsUserData::~SupportsUserData() { 37 DCHECK(thread_checker_.CalledOnValidThread() || user_data_.empty()); 38 DataMap local_user_data; 39 user_data_.swap(local_user_data); 40 // Now this->user_data_ is empty, and any destructors called transitively from 41 // the destruction of |local_user_data| will see it that way instead of 42 // examining a being-destroyed object. 43 } 44 45 } // namespace base 46
