activeobjectmgr.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2010-2018 nerzhul, Loic BLOT <loic.blot@unix-experience.fr>
 
#pragma once
 
#include <memory>
#include "util/container.h"
#include "irrlichttypes.h"
#include "util/basic_macros.h"
 
class TestClientActiveObjectMgr;
class TestServerActiveObjectMgr;
 
template <typename T>
class ActiveObjectMgr
{
        friend class ::TestServerActiveObjectMgr;
 
public:
        ActiveObjectMgr() = default;
        DISABLE_CLASS_COPY(ActiveObjectMgr);
 
        virtual ~ActiveObjectMgr()
        {
                SANITY_CHECK(m_active_objects.empty());
                // Note: Do not call clear() here. The derived class is already half
                // destructed.
        }
 
        virtual void step(float dtime, const std::function<void(T *)> &f) = 0;
        virtual bool registerObject(std::unique_ptr<T> obj) = 0;
        virtual void removeObject(u16 id) = 0;
 
        void clear()
        {
                // on_destruct could add new objects so this has to be a loop
                do {
                        for (auto &it : m_active_objects.iter()) {
                                if (!it.second)
                                        continue;
                                m_active_objects.remove(it.first);
                        }
                } while (!m_active_objects.empty());
        }
 
        T *getActiveObject(u16 id)
        {
                return m_active_objects.get(id).get();
        }
 
protected:
        u16 getFreeId() const
        {
                // try to reuse id's as late as possible
                static thread_local u16 last_used_id = 0;
                u16 startid = last_used_id;
                while (!isFreeId(++last_used_id)) {
                        if (last_used_id == startid)
                                return 0;
                }
 
                return last_used_id;
        }
 
        bool isFreeId(u16 id) const
        {
                return id != 0 && !m_active_objects.get(id);
        }
 
        // Note that this is ordered to fix #10985
        ModifySafeMap<u16, std::unique_ptr<T>> m_active_objects;
};