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(***********************************************************************)
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(* A Functional Constraint Library *)
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(* Nicolas Barnier, Pascal Brisset, LOG, CENA *)
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(* Copyright 2004 CENA. All rights reserved. This file is distributed *)
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(* under the terms of the GNU Lesser General Public License. *)
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(***********************************************************************)
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(* $Id: fcl_gcc.mli,v 1.15 2004/07/23 16:37:34 barnier Exp $ *)
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(** Global Cardinality Constraint *)
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type level = Basic | Medium | High
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val cstr : ?level:level -> Fcl_var.Fd.t array -> (Fcl_var.Fd.t * int) array -> Fcl_cstr.t
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(** [cstr (?level:High) vars distribution] returns a constraint ensuring
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that for each pair [(c,v)] of cardinal variable [c] and integer
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value [v] in the list [distribution], [c] variables in the array
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[vars] will be instantiated to [v], i.e. [card \{vi = v | vi in vars\} = c].
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All values [v] in [distribution] must be different otherwise the exception
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[Invalid_argument] is raised. Three levels of propagation are provided :
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[Basic] is the quickest, [High] performs the highest amount of propagation.
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[level] default value is [High].
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The constraint posts the redundant constraint stating that the sum of the
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cardinals is equal to the number of variables. This constraint is also
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known as the "distribute" constraint.
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