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Types generic with units of measures examples
f#

hi all,

is there an example somewhere on how to define types that are generic in units-of-measure. I need to have a Point2 class with overloaded operators +, -, *, dot etc; but i really can't seem to get that to work when using measures.

.

Andrew's blog is good; e.g.

[link:blogs.msdn.com]

By on 10/10/2008 3:47 PM ()

in fact, it is from that website that i got the idea, but it says

"Next time, we'll write types that are generic in units-of-measure. This makes the feature extensible: if floats with units aren't what you want, just define your own types!"

i am looking for that exact example.

-f

By on 10/10/2008 10:41 PM ()

Actually, Andrew has posted a quick example of such a type in his very first blog post on units in comments:

[link:blogs.msdn.com]

The syntax is fairly obvious. I'll reproduce it here for convenience:

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[<Measure>] type m

[<Measure>] type s

type Vector< [<Measure>] 'a> = struct

 val X:float<'a>

 val Y:float<'a>

 val Z:float<'a>

 new(x,y,z) = {X=x;Y=y;Z=z}

end

let v = Vector(2.0<m/s>,3.0<m/s>,4.0<m/s>)
By on 10/10/2008 11:49 PM ()

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