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/*
-----------------------------------------------------------------------
Copyright: 2010-2015, iMinds-Vision Lab, University of Antwerp
2014-2015, CWI, Amsterdam
Contact: astra@uantwerpen.be
Website: http://sf.net/projects/astra-toolbox
This file is part of the ASTRA Toolbox.
The ASTRA Toolbox 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.
The ASTRA Toolbox 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 the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
$Id$
*/
#ifndef _INC_ASTRA_SINGLETON
#define _INC_ASTRA_SINGLETON
#include <cassert>
#ifndef _MSC_VER
#include <stdint.h>
#endif
namespace astra {
/**
* This singleton interface class ensures that any of its children can be instatiated only once. This is used by the ObjectFactories.
**/
template<typename T>
class Singleton {
public:
// constructor
Singleton() {
assert(!m_singleton);
int offset = (uintptr_t)(T*)1 - (uintptr_t)(Singleton<T>*)(T*)1;
m_singleton = (T*)((uintptr_t)this + offset);
};
// destructor
virtual ~Singleton() {
assert(m_singleton);
m_singleton = 0;
}
// get singleton
static T& getSingleton() {
if (!m_singleton)
m_singleton = new T();
return *m_singleton;
}
static T* getSingletonPtr() {
if (!m_singleton)
m_singleton = new T();
return m_singleton;
}
private:
// the singleton
static T* m_singleton;
};
#define DEFINE_SINGLETON(T) template<> T* Singleton<T >::m_singleton = 0
// This is a hack to support statements like
// DEFINE_SINGLETON2(CTemplatedClass<C1, C2>);
#define DEFINE_SINGLETON2(A,B) template<> A,B* Singleton<A,B >::m_singleton = 0
} // end namespace
#endif
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