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 /*
     SPDX-FileCopyrightText: 2006-2007 Volker Krause <vkrause@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 /**
   @file
   This file is part of the API for handling @ref MIME data and
   defines the ContentIndex class.
 
   @brief
   Defines the ContentIndex class.
 
   @authors Volker Krause \<vkrause@kde.org\>
 
   @glossary @anchor RFC3501 @anchor rfc3501 @b RFC @b 3501:
   RFC that defines the <a href="https://tools.ietf.org/html/rfc3501">
   Internet Message Access Protocol (IMAP)</a>.
 */
 
 #pragma once
 
 #include "kmime_export.h"
 
 #include <QSharedDataPointer>
 #include <QString>
 #include <QMetaType>
 
 namespace KMime
 {
 
 /**
   @brief
   A class to uniquely identify message parts (Content) in a hierarchy.
 
   This class is implicitly shared.
 
   Based on @ref RFC3501 section 6.4.5 and thus compatible with @acronym IMAP.
 */
 class KMIME_EXPORT ContentIndex
 {
 public:
     /**
       Creates an empty content index.
     */
     ContentIndex();
 
     /**
       Creates a content index based on the specified string representation.
 
       @param index is a string representation of a message part index according
       to @ref RFC3501 section 6.4.5.
     */
     explicit ContentIndex(const QString &index);
 
     /**
       Copy constructor.
     */
     ContentIndex(const ContentIndex &other);
 
     /**
       Destructor.
     */
     ~ContentIndex();
 
     /**
       Returns true if this index is non-empty (valid).
     */
     Q_REQUIRED_RESULT bool isValid() const;
 
     /**
       Removes and returns the top-most index. Used to recursively
       descend into the message part hierarchy.
 
       @see push(), up().
     */
     Q_REQUIRED_RESULT unsigned int pop();
 
     /**
       Adds @p index to the content index. Used when ascending the message
       part hierarchy.
 
       @param index is the top-most content index part.
 
       @see pop(), up().
     */
     void push(unsigned int index);
 
     /**
       Removes and returns the bottom-most index. Used to navigate to
       the parent part.
 
       @see push(), pop().
     */
     unsigned int up();
 
     /**
       Returns a string representation of this content index according
       to @ref RFC3501 section 6.4.5.
     */
     Q_REQUIRED_RESULT QString toString() const;
 
     /**
       Compares this with @p index for equality.
 
       @param index is the content index to compare.
     */
     Q_REQUIRED_RESULT bool operator==(const ContentIndex &index) const;
 
     /**
       Compares this with @p index for inequality.
 
       @param index is the content index to compare.
     */
     Q_REQUIRED_RESULT bool operator!=(const ContentIndex &index) const;
 
     /**
       Assignment operator.
     */
     ContentIndex &operator=(const ContentIndex &other);
 
 private:
     //@cond PRIVATE
     class Private;
     QSharedDataPointer<Private> d;
     //@endcond
 };
 
 KMIME_EXPORT uint qHash(const KMime::ContentIndex &);
 
 }  //namespace KMime
 
 Q_DECLARE_METATYPE(KMime::ContentIndex)