75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/supports_user_data.h"
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namespace base {
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std::unique_ptr<SupportsUserData::Data> SupportsUserData::Data::Clone() {
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return nullptr;
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}
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SupportsUserData::SupportsUserData() {
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// Harmless to construct on a different execution sequence to subsequent
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// usage.
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sequence_checker_.DetachFromSequence();
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}
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SupportsUserData::SupportsUserData(SupportsUserData&&) = default;
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SupportsUserData& SupportsUserData::operator=(SupportsUserData&&) = default;
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SupportsUserData::Data* SupportsUserData::GetUserData(const void* key) const {
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DCHECK(sequence_checker_.CalledOnValidSequence());
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// Avoid null keys; they are too vulnerable to collision.
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DCHECK(key);
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auto found = user_data_.find(key);
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if (found != user_data_.end())
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return found->second.get();
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return nullptr;
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}
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void SupportsUserData::SetUserData(const void* key,
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std::unique_ptr<Data> data) {
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DCHECK(sequence_checker_.CalledOnValidSequence());
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// Avoid null keys; they are too vulnerable to collision.
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DCHECK(key);
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if (data.get())
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user_data_[key] = std::move(data);
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else
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RemoveUserData(key);
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}
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void SupportsUserData::RemoveUserData(const void* key) {
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DCHECK(sequence_checker_.CalledOnValidSequence());
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user_data_.erase(key);
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}
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void SupportsUserData::DetachFromSequence() {
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sequence_checker_.DetachFromSequence();
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}
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void SupportsUserData::CloneDataFrom(const SupportsUserData& other) {
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for (const auto& data_pair : other.user_data_) {
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auto cloned_data = data_pair.second->Clone();
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if (cloned_data)
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SetUserData(data_pair.first, std::move(cloned_data));
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}
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}
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SupportsUserData::~SupportsUserData() {
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DCHECK(sequence_checker_.CalledOnValidSequence() || user_data_.empty());
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DataMap local_user_data;
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user_data_.swap(local_user_data);
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// Now this->user_data_ is empty, and any destructors called transitively from
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// the destruction of |local_user_data| will see it that way instead of
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// examining a being-destroyed object.
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}
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void SupportsUserData::ClearAllUserData() {
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DCHECK(sequence_checker_.CalledOnValidSequence());
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user_data_.clear();
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}
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} // namespace base
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