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// * This file is part of the COLOBOT source code
// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
// *
// * 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 http://www.gnu.org/licenses/.
/**
* \file common/singleton.h
* \brief CSingleton base class for singletons
*/
#pragma once
#include <cassert>
template<typename T> class CSingleton
{
protected:
static T* m_instance;
public:
static T& GetInstance()
{
assert(m_instance != nullptr);
return *m_instance;
}
static T* GetInstancePointer()
{
assert(m_instance != nullptr);
return m_instance;
}
static bool IsCreated()
{
return m_instance != nullptr;
}
CSingleton()
{
assert(m_instance == nullptr);
m_instance = static_cast<T *>(this);
}
virtual ~CSingleton()
{
m_instance = nullptr;
}
#ifdef TESTS
static void ReplaceInstance(T* newInstance)
{
assert(newInstance != nullptr);
if (m_instance != nullptr)
delete m_instance;
m_instance = newInstance;
}
#endif
private:
CSingleton& operator=(const CSingleton<T> &);
CSingleton(const CSingleton<T> &);
};
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