The only thing that speaks against this implementation is that you likely shouldn't be using a Singleton at all.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
There are no more "hours", it's centi-days. They say it's better, but this tiny ad says it's stupid:
a bit of art, as a gift, that will fit in a stocking