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/* SPDX-FileCopyrightText: 2026 Project Tick
* SPDX-FileContributor: Project Tick
* SPDX-License-Identifier: GPL-3.0-or-later
*
* MeshMC - A Custom Launcher for Minecraft
* Copyright (C) 2026 Project Tick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <cstddef>
#include <memory>
#include "QObjectPtr.h"
class Usable;
/**
* Base class for things that can be used by multiple other things and we want
* to track the use count.
*
* @see UseLock
*/
class Usable
{
friend class UseLock;
public:
std::size_t useCount() const
{
return m_useCount;
}
bool isInUse() const
{
return m_useCount > 0;
}
protected:
virtual void decrementUses()
{
m_useCount--;
}
virtual void incrementUses()
{
m_useCount++;
}
private:
std::size_t m_useCount = 0;
};
/**
* Lock class to use for keeping track of uses of other things derived from
* Usable
*
* @see Usable
*/
class UseLock
{
public:
UseLock(shared_qobject_ptr<Usable> usable) : m_usable(usable)
{
// this doesn't use shared pointer use count, because that wouldn't be
// correct. this count is separate.
m_usable->incrementUses();
}
~UseLock()
{
m_usable->decrementUses();
}
private:
shared_qobject_ptr<Usable> m_usable;
};
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