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diff --git a/src/libs/clangsupport/directoryandfilepathid.h b/src/libs/clangsupport/directoryandfilepathid.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 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.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "directorypathid.h"
+#include "filepathid.h"
+
+#include <QDataStream>
+
+#include <vector>
+
+namespace ClangBackEnd {
+class DirectoryAndFilePathId
+{
+public:
+    constexpr DirectoryAndFilePathId() = default;
+
+    DirectoryAndFilePathId(const char *) = delete;
+
+    DirectoryAndFilePathId(int directoryPathId, int filePathId)
+        : directoryPathId(directoryPathId)
+        , filePathId(filePathId)
+    {}
+
+    bool isValid() const { return directoryPathId.isValid() && filePathId.isValid(); }
+
+    friend bool operator==(DirectoryAndFilePathId first, DirectoryAndFilePathId second)
+    {
+        return first.isValid() && first.directoryPathId == second.directoryPathId
+               && first.filePathId == second.filePathId;
+    }
+
+    friend bool operator!=(DirectoryAndFilePathId first, DirectoryAndFilePathId second)
+    {
+        return !(first == second);
+    }
+
+    friend bool operator<(DirectoryAndFilePathId first, DirectoryAndFilePathId second)
+    {
+        return std::tie(first.directoryPathId, first.filePathId)
+               < std::tie(second.directoryPathId, second.filePathId);
+    }
+
+    friend QDataStream &operator<<(QDataStream &out,
+                                   const DirectoryAndFilePathId &directoryAndFilePathId)
+    {
+        out << directoryAndFilePathId.directoryPathId;
+        out << directoryAndFilePathId.filePathId;
+
+        return out;
+    }
+
+    friend QDataStream &operator>>(QDataStream &in, DirectoryAndFilePathId &directoryAndFilePathId)
+    {
+        in >> directoryAndFilePathId.directoryPathId;
+        in >> directoryAndFilePathId.filePathId;
+        return in;
+    }
+
+public:
+    DirectoryPathId directoryPathId;
+    FilePathId filePathId;
+};
+
+using DirectoryAndFilePathIds = std::vector<DirectoryAndFilePathId>;
+
+} // namespace ClangBackEnd