singleton_template.hpp

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#ifndef SINGLETONTEMPLATE_HPP_
#define SINGLETONTEMPLATE_HPP_



#define STATIC_INSTANCE                     1
#define STATIC_POINTER_INSTANCE             2
#define STATIC_PRIVATE_POINTER_INSTANCE     3
#define SINGLETON_INIT_METHOD               STATIC_PRIVATE_POINTER_INSTANCE



template <typename classType>
class SingletonTemplate
{
public:
    static classType& getInstance();

protected:
    #if (SINGLETON_INIT_METHOD == STATIC_PRIVATE_POINTER_INSTANCE)
        static SingletonTemplate* mpSingletonInstance;
    #endif

    SingletonTemplate() {}

private:
    /* No Private Members */
};







#if (SINGLETON_INIT_METHOD == STATIC_POINTER_INSTANCE)
    template <typename classType>
    classType& SingletonTemplate<classType>::getInstance()
    {
        static classType* mpSingletonInstance = new classType();
        return *mpSingletonInstance;
    }
#elif (SINGLETON_INIT_METHOD == STATIC_INSTANCE)
    template <typename classType>
    classType& SingletonTemplate<classType>::getInstance()
    {
        static classType singletonInstance;
        return singletonInstance;
    }
#elif (SINGLETON_INIT_METHOD == STATIC_PRIVATE_POINTER_INSTANCE)
    template <typename classType>
    SingletonTemplate<classType>* SingletonTemplate<classType>::mpSingletonInstance = 0;

    template <typename classType>
    classType& SingletonTemplate<classType>::getInstance()
    {
        if(0 == mpSingletonInstance)
        {
            mpSingletonInstance = new classType();
        }
        return *(classType*)mpSingletonInstance;
    }
#else
    #error SINGLETON_INIT_METHOD contains invalid value
#endif


#endif /* SINGLETONTEMPLATE_HPP_ */