[Haskell-cafe] RE: [Haskell] Re: Trying to install binary-0.4

Bayley, Alistair Alistair_Bayley at invescoperpetual.co.uk
Tue Oct 16 09:01:01 EDT 2007

> From: Simon Marlow [mailto:simonmarhaskell at gmail.com] 
> The lexicographical ordering would make 10.0 > 9.3.  In 
> general, A.B > C.D 
> iff A > C or A == C && B > D.  When we say the "latest" 
> version we mean 
> "greatest", implying that version numbers increase with time. 
>  Does that help?

Sort of. It's what I'd expect from a sensible version comparison. It's
just not something I'd ever choose to call lexicographic ordering. IMO,
lexicographgic ordering is a basic string comparision so e.g.

max "10.0" "9.3" = "9.3"

I'd call what you're doing numeric ordering. Does it have a better name,
like version-number-ordering, or section-number-ordering (e.g. Section
3.2.5, Section 3.2.6)?

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