Should you (= If you)

[Sitifan]

Should you (= If you) ever need anything, please don't hesitate to contact me.
http://dictionary.cambridge.org/defi...3138&dict=CALD
Is the above explanation correct?
I was taught that should you is a literary equivalent of if you should, not if you.
_________________
Thank you very much for your reply.

[Barb_D]

In practice, do you see a big difference?
If you need me,...
If you should need me,...
Should you need me,...

What circumstances do you think you'd use one, but find another one of those incorrect?

[Sitifan]

Should you (=If you) come here tomorrow, I will give you my dictionary.
Is the above explanation correct?
1) If you came here tomorrow, I would give you my dictionary.
2) If you were to come here tomorrow, I would give you my dictionary.
3) If you should come here tomorrow, I would give you my dictionary.
4) If you come here tomorrow, I will give you my dictionary.
What's the difference in meaning between the above sentences?
_________________
Thank you very much for your reply.