/scr/tee1/isis/lib/Core/CoreUtils/singletons.hpp

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#ifndef SINGLETONS_HPP_INCLUDED
#define SINGLETONS_HPP_INCLUDED

#include <map>
#include <boost/noncopyable.hpp>
#include <string>
#include <iostream>
#include <typeinfo>

namespace isis
{
namespace util
{

class Singletons
{
    template <typename C> class Singleton
    {
        static void destruct() {
            if( _instance )delete _instance;

            _instance = 0;
        }
        static C *_instance;
        Singleton () { }
    public:
        friend class Singletons;
    };

    typedef void( *destructer )();
    typedef std::multimap<int, destructer> prioMap;

    prioMap map;
    Singletons();
    virtual ~Singletons();
    static Singletons &getMaster();
public:
    template<typename T, int PRIO> static T &get() {
        if ( !Singleton<T>::_instance ) {
            Singleton<T>::_instance = new T();
            prioMap &map = getMaster().map;
            map.insert( map.find( PRIO ), std::make_pair( PRIO, Singleton<T>::destruct ) );
        }

        return *Singleton<T>::_instance;
    }
};
template <typename C> C *Singletons::Singleton<C>::_instance = 0;

}
}
#endif //SINGLETONS_HPP_INCLUDED