Singleton pattern template

class SingletonClass
{
    public static SingletonClass instance()
    {
        SingletonClass singleton;
        // AX2012
        //SysGlobalCache  globalCache = infolog.objectOnServer() ? appl.globalCache() : infolog.globalCache();
        // AX7/d365
        SysGlobalCache  globalCache = appl.globalCache();

        if (globalCache.isSet(classStr(SingletonClass), 0))
        {
            singleton = globalCache.get(classStr(SingletonClass), 0);
        }
        else
        {
            singleton = new SingletonClass();
            //  Additional line for AX2012
            //infoLog.globalCache().set(classStr(SingletonClass), 0, singleton);
            appl.globalCache().set(classStr(SingletonClass), 0, singleton);
        }

        return singleton;
    }

    // Should be private, but AX7/D365 gives BP error
    protected void new()
    {
    }
}