RSingleton.h

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#ifndef RSINGLETON_H_
#define RSINGLETON_H_
 
#include "core_global.h"
 
#include <QMap>
#include <QMetaType>
#include <QString>
#include <typeinfo>
 
class QCADCORE_EXPORT RSingleton {
public:
    virtual ~RSingleton() {
    }
    template<class Derived>
        static Derived& getInstance();
        static void cleanUp();
 
protected:
    RSingleton();
 
private:
    static QMap<QString, RSingleton*> map;
};
 
Q_DECLARE_METATYPE(RSingleton*)
 
template<class Derived>
Derived& RSingleton::getInstance() {
    if (!map.contains(typeid(Derived).name())) {
        map[typeid(Derived).name()] = new Derived;
    }
    Derived* d = dynamic_cast<Derived*> (map[typeid(Derived).name()]);
    if (d == NULL) {
        Q_ASSERT("RSingleton::getInstance(): \"Derived\" in not a singleton");
    }
    return *d;
}
 
#endif /* RSINGLETON_H_ */