[Caml-list] getting the type of a polymorphic data ?

[Diego Olivier Fernandez Pons <Diego.FERNANDEZ_PONS@etu.upmc.fr>]

    Bonjour,

In a branch and bound program I give the user a generic polymorphic
data structure to represent decision variables, namely a set of
intervals - (domains decrease monotonically)

x = [0 .. 1] U [2 .. 3[
y = [3,5  14,8]

As usual in branch and bound, a value is tried (x = 1) and removed of
the domain if the corresponding branch raises a 'No solution'
exception (x = [0 .. 1[ U [2 .. 3[)

In a preprocessing phase I would like to change the representation of
the decision variables according to their type to avoid degenerancies
like

[0 .. 1[ U ]2 .. 3[ U ]4 .. 5[ -> [0] in the integer case but not with
floats

The problem is that I don't know how to catch the type of a
polymorphic data structure (is this even possible with some magic ?)
to be able to write something like

let x' = match (somemagic.type_of x) with
           | INT -> IntSet.from_poly x
           | FLOAT -> FloatIntervalSet.from_poly x
           | _ -> x

Any hints ?


         Diego Olivier

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