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in_chrstore(+CHRConst)

Test if CHRConst is in the CHR constraint store or not
CHRConst
A CHR constraint

Description

This predicate is used to test if a particular CHR constraint is in the CHR constraint store or not. It can be used to prevent the addition of redundant constraints. This only useful if the 'already_in_store' option is off.

Modules

This predicate is sensitive to its module context (tool predicate, see @/2).

Examples

    X leq Y, Y leq Z ==> \+in_chrstore(X leq Z)| X leq Z.