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//
// VMime library (http://vmime.sourceforge.net)
// Copyright (C) 2002-2004 Vincent Richard <[email protected]>
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
#ifndef VMIME_UTILITY_SINGLETON_HPP_INCLUDED
#define VMIME_UTILITY_SINGLETON_HPP_INCLUDED
#include <list>
namespace vmime {
namespace utility {
// Singleton abstract base class.
class abstractSingleton
{
friend class singletonManager;
protected:
abstractSingleton() { }
virtual ~abstractSingleton() { }
};
// Singleton manager
// (for automatic clean-up of all instanciated singletons).
class singletonManager
{
public:
static singletonManager* getInstance();
void manage(abstractSingleton* s);
private:
singletonManager();
~singletonManager();
std::list <abstractSingleton*> m_list;
};
// A singleton template.
template <class TYPE>
class singleton : public abstractSingleton
{
protected:
singleton() { }
~singleton() { }
public:
static TYPE* getInstance()
{
static TYPE* inst = NULL;
if (!inst)
singletonManager::getInstance()->manage(inst = new TYPE());
return (inst);
}
};
} // utility
} // vmime
#endif // VMIME_UTILITY_SINGLETON_HPP_INCLUDED
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