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[Caml-list] how to define a property list
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Date: -- (:)
From: Christoph Bauer <c_bauer@i...>
Subject: Re: [Caml-list] how to define a property list
Hi,

> Could well be missing the point entirely here, but what about:
>
> type 'a tree = Leaf of 'a | Node of 'a tree * 'a * 'a tree
>
> and then use something simple like an assoc-list for storing the
> properties, so your final type would be:
>
> (string * string) list tree
            ^^^^^^ this could be a int or a string in the same tree!

> eg:
>
> let t = Node (Leaf [], [ "prop1", "value1" ], Leaf []);;
> val t : (string * string) list tree = (* ... *)
>
> This seems to separate out the 'treeness' from what is stored at each
> node, so you can use generic algorithms to operate over the tree.

Of course I could convert my integer to strings (and back),
but this solutions isn't so satisfying

Regards,
Christoph Bauer

-- 
beginfig(1)u=3cm;draw fullcircle scaled 2u;x0=x1=y1=x2=y3=0;-y0=y2=x3=1u;
filldraw z0..{left}z1{left}..z2{curl 1}..z3..z0..cycle;def t(expr p)=fullcircle
scaled .25u shifted(0,p*u);enddef;unfill t(.5);fill t(-.5);endfig;bye

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