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.
5 #include "base/supports_user_data.h"
9 std::unique_ptr<SupportsUserData::Data> SupportsUserData::Data::Clone() {
13 SupportsUserData::SupportsUserData() {
14 // Harmless to construct on a different execution sequence to subsequent
16 sequence_checker_.DetachFromSequence();
19 SupportsUserData::SupportsUserData(SupportsUserData&&) = default;
20 SupportsUserData& SupportsUserData::operator=(SupportsUserData&&) = default;
22 SupportsUserData::Data* SupportsUserData::GetUserData(const void* key) const {
23 DCHECK(sequence_checker_.CalledOnValidSequence());
24 // Avoid null keys; they are too vulnerable to collision.
26 auto found = user_data_.find(key);
27 if (found != user_data_.end())
28 return found->second.get();
32 void SupportsUserData::SetUserData(const void* key,
33 std::unique_ptr<Data> data) {
34 DCHECK(sequence_checker_.CalledOnValidSequence());
35 // Avoid null keys; they are too vulnerable to collision.
38 user_data_[key] = std::move(data);
43 void SupportsUserData::RemoveUserData(const void* key) {
44 DCHECK(sequence_checker_.CalledOnValidSequence());
45 user_data_.erase(key);
48 void SupportsUserData::DetachFromSequence() {
49 sequence_checker_.DetachFromSequence();
52 void SupportsUserData::CloneDataFrom(const SupportsUserData& other) {
53 for (const auto& data_pair : other.user_data_) {
54 auto cloned_data = data_pair.second->Clone();
56 SetUserData(data_pair.first, std::move(cloned_data));
60 SupportsUserData::~SupportsUserData() {
61 DCHECK(sequence_checker_.CalledOnValidSequence() || user_data_.empty());
62 DataMap local_user_data;
63 user_data_.swap(local_user_data);
64 // Now this->user_data_ is empty, and any destructors called transitively from
65 // the destruction of |local_user_data| will see it that way instead of
66 // examining a being-destroyed object.
69 void SupportsUserData::ClearAllUserData() {
70 DCHECK(sequence_checker_.CalledOnValidSequence());