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The CLP Procedure

ALLDIFF Statement

ALLDIFF (variable_list-1) <...(variable_list-n)> ;
ALLDIFFERENT (variable_list-1) <...(variable_list-n)> ;

The ALLDIFF statement can have multiple specifications. Each specification defines a unique global constraint on a set of variables, requiring all of them to be different from each other. A global constraint is equivalent to a conjunction of elementary constraints.

For example, the statements

var (X1-X3) A B;
alldiff (X1-X3) (A B);

are equivalent to

     

If the variable list is empty, the ALLDIFF constraint applies to all the variables declared in any VARIABLE statement.

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