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diff --git a/src/tools/clangpchmanagerbackend/source/projectpartsmanager.cpp b/src/tools/clangpchmanagerbackend/source/projectpartsmanager.cpp
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+++ b/src/tools/clangpchmanagerbackend/source/projectpartsmanager.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "projectpartsmanager.h"
+
+#include <projectpartcontainer.h>
+
+#include <algorithm>
+
+namespace ClangBackEnd {
+
+inline namespace Pch {
+
+ProjectPartContainers ProjectPartsManager::update(ProjectPartContainers &&projectsParts)
+{
+    auto updatedProjectPartContainers = newProjectParts(std::move(projectsParts));
+
+    mergeProjectParts(updatedProjectPartContainers);
+
+    return updatedProjectPartContainers;
+}
+
+void ProjectPartsManager::remove(const Utils::SmallStringVector &ids)
+{
+    auto shouldRemove = [&] (const ProjectPartContainer &projectPart) {
+        return std::find(ids.begin(), ids.end(), projectPart.projectPartId) != ids.end();
+    };
+
+    auto newEnd = std::remove_if(m_projectParts.begin(), m_projectParts.end(), shouldRemove);
+    m_projectParts.erase(newEnd, m_projectParts.end());
+}
+
+ProjectPartContainers ProjectPartsManager::projects(const Utils::SmallStringVector &projectPartIds) const
+{
+    ProjectPartContainers projectPartsWithIds;
+
+    std::copy_if(m_projectParts.begin(),
+                 m_projectParts.end(),
+                 std::back_inserter(projectPartsWithIds),
+                 [&] (const ProjectPartContainer &projectPart) {
+        return std::binary_search(projectPartIds.begin(), projectPartIds.end(), projectPart.projectPartId);
+    });
+
+    return projectPartsWithIds;
+}
+
+void ProjectPartsManager::updateDeferred(const ProjectPartContainers &deferredProjectsParts)
+{
+    using ProjectPartContainerReferences = std::vector<std::reference_wrapper<ProjectPartContainer>>;
+
+    ProjectPartContainerReferences deferredProjectPartPointers;
+    deferredProjectPartPointers.reserve(deferredProjectsParts.size());
+
+    std::set_intersection(m_projectParts.begin(),
+                          m_projectParts.end(),
+                          deferredProjectsParts.begin(),
+                          deferredProjectsParts.end(),
+                          std::back_inserter(deferredProjectPartPointers),
+                          [](const ProjectPartContainer &first, const ProjectPartContainer &second) {
+                              return first.projectPartId < second.projectPartId;
+                          });
+
+    for (ProjectPartContainer &projectPart : deferredProjectPartPointers)
+        projectPart.updateIsDeferred = true;
+}
+
+ProjectPartContainers ProjectPartsManager::deferredUpdates()
+{
+    ProjectPartContainers deferredProjectParts;
+    deferredProjectParts.reserve(m_projectParts.size());
+
+    std::copy_if(m_projectParts.cbegin(),
+                 m_projectParts.cend(),
+                 std::back_inserter(deferredProjectParts),
+                 [](const ProjectPartContainer &projectPart) { return projectPart.updateIsDeferred; });
+
+    for (ProjectPartContainer &projectPart : m_projectParts)
+        projectPart.updateIsDeferred = false;
+
+    return deferredProjectParts;
+}
+
+ProjectPartContainers ProjectPartsManager::newProjectParts(ProjectPartContainers &&projectsParts) const
+{
+    ProjectPartContainers updatedProjectPartContainers;
+    updatedProjectPartContainers.reserve(projectsParts.size());
+
+    std::set_difference(std::make_move_iterator(projectsParts.begin()),
+                        std::make_move_iterator(projectsParts.end()),
+                        m_projectParts.begin(),
+                        m_projectParts.end(),
+                        std::back_inserter(updatedProjectPartContainers));
+
+    return updatedProjectPartContainers;
+}
+
+void ProjectPartsManager::mergeProjectParts(const ProjectPartContainers &projectsParts)
+{
+    ProjectPartContainers newProjectParts;
+    newProjectParts.reserve(m_projectParts.size() + projectsParts.size());
+
+    auto compare = [] (const ProjectPartContainer &first, const ProjectPartContainer &second) {
+        return first.projectPartId < second.projectPartId;
+    };
+
+    std::set_union(projectsParts.begin(),
+                   projectsParts.end(),
+                   m_projectParts.begin(),
+                   m_projectParts.end(),
+                   std::back_inserter(newProjectParts),
+                   compare);
+
+    m_projectParts = newProjectParts;
+}
+
+const ProjectPartContainers &ProjectPartsManager::projectParts() const
+{
+    return m_projectParts;
+}
+
+} // namespace Pch
+
+} // namespace ClangBackEnd