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- // 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.
- #include "base/supports_user_data.h"
- #include "base/sequence_checker.h"
- namespace base {
- std::unique_ptr<SupportsUserData::Data> SupportsUserData::Data::Clone() {
- return nullptr;
- }
- SupportsUserData::SupportsUserData() {
- // Harmless to construct on a different execution sequence to subsequent
- // usage.
- DETACH_FROM_SEQUENCE(sequence_checker_);
- }
- SupportsUserData::SupportsUserData(SupportsUserData&&) = default;
- SupportsUserData& SupportsUserData::operator=(SupportsUserData&&) = default;
- SupportsUserData::Data* SupportsUserData::GetUserData(const void* key) const {
- DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
- // Avoid null keys; they are too vulnerable to collision.
- DCHECK(key);
- auto found = user_data_.find(key);
- if (found != user_data_.end())
- return found->second.get();
- return nullptr;
- }
- void SupportsUserData::SetUserData(const void* key,
- std::unique_ptr<Data> data) {
- DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
- // Avoid null keys; they are too vulnerable to collision.
- DCHECK(key);
- if (data.get())
- user_data_[key] = std::move(data);
- else
- RemoveUserData(key);
- }
- void SupportsUserData::RemoveUserData(const void* key) {
- DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
- user_data_.erase(key);
- }
- void SupportsUserData::DetachFromSequence() {
- DETACH_FROM_SEQUENCE(sequence_checker_);
- }
- void SupportsUserData::CloneDataFrom(const SupportsUserData& other) {
- for (const auto& data_pair : other.user_data_) {
- auto cloned_data = data_pair.second->Clone();
- if (cloned_data)
- SetUserData(data_pair.first, std::move(cloned_data));
- }
- }
- SupportsUserData::~SupportsUserData() {
- if (!user_data_.empty()) {
- DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
- }
- DataMap local_user_data;
- user_data_.swap(local_user_data);
- // Now this->user_data_ is empty, and any destructors called transitively from
- // the destruction of |local_user_data| will see it that way instead of
- // examining a being-destroyed object.
- }
- void SupportsUserData::ClearAllUserData() {
- DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
- user_data_.clear();
- }
- } // namespace base
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