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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.