src/base/applicationcomponent.h

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2022  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 <concepts>
  32 #include <utility>
  33
  34 #include <QtClassHelperMacros>
  35
  36 class IApplication;
  37
  38 class ApplicationComponentBase
  39 {
  40     Q_DISABLE_COPY_MOVE(ApplicationComponentBase)
  41
  42 public:
  43     virtual ~ApplicationComponentBase() = default;
  44
  45     IApplication *app() const;
  46
  47 protected:
  48     explicit ApplicationComponentBase(IApplication *app);
  49
  50 private:
  51     IApplication *m_app = nullptr;
  52 };
  53
  54 template <typename T>
  55 concept IsApplicationComponent = std::derived_from<T, ApplicationComponentBase>;
  56
  57 template <typename Base>
  58 requires (!IsApplicationComponent<Base>)
  59 class ApplicationComponent : public Base, public ApplicationComponentBase
  60 {
  61 public:
  62     template <typename... Args>
  63     explicit ApplicationComponent(IApplication *app, Args&&... args)
  64         : Base(std::forward<Args>(args)...)
  65         , ApplicationComponentBase(app)
  66     {
  67     }
  68 };