src/base/tag.h

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2023  Vladimir Golovnev <glassez@yandex.ru>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  *
  19  * In addition, as a special exception, the copyright holders give permission to
  20  * link this program with the OpenSSL project's "OpenSSL" library (or with
  21  * modified versions of it that use the same license as the "OpenSSL" library),
  22  * and distribute the linked executables. You must obey the GNU General Public
  23  * License in all respects for all of the code used other than "OpenSSL".  If you
  24  * modify file(s), you may extend this exception to your version of the file(s),
  25  * but you are not obligated to do so. If you do not wish to do so, delete this
  26  * exception statement from your version.
  27  */
  28
  29 #pragma once
  30
  31 #include <QMetaType>
  32 #include <QString>
  33
  34 class Tag final
  35 {
  36 public:
  37     Tag() = default;
  38
  39     explicit Tag(const QString &tagStr);
  40     explicit Tag(const std::string &tagStr);
  41
  42     bool isValid() const;
  43     bool isEmpty() const;
  44
  45     QString toString() const noexcept;
  46
  47     explicit operator QString() const noexcept;
  48
  49     friend bool operator==(const Tag &, const Tag &) = default;
  50
  51 private:
  52     QString m_tagStr;
  53 };
  54
  55 Q_DECLARE_METATYPE(Tag)
  56
  57 QDataStream &operator<<(QDataStream &out, const Tag &tag);
  58 QDataStream &operator>>(QDataStream &in, Tag &tag);
  59
  60 template <>
  61 struct std::hash<Tag>
  62 {
  63     std::size_t operator()(const Tag &tag, const std::size_t seed = 0) const noexcept
  64     {
  65         return qHash(tag.toString(), seed);
  66     }
  67 };