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# <ConsistencyModule:> neg(+Con,Bool)

Bool is the logical negation of the reified truth constraints Con.

Con
  Constraint
Bool
  Reified truth value of the constraint (array notation accepted)

## Description

Equivalent to B #= (Con), Bool #= 1-B

Bool is the logical negation of the reified truth constraint Con. Con must be a constraint that has a corresponding reified form.

ConsistencyModule is the optional module specification to give the consistency level for the propagation for this constraint: gfd_bc for bounds consistency, and gfd_gac for domain (generalised arc) consistency.

This constraint is implemented using Gecode's MiniModel's rel() for both integer and boolean expressions, with sub-expressions/constraints not supported by MiniModel factored out and posted as auxiliary constraints.

### Modules

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

## See Also

and / 3, neg / 1, xor / 3, or / 3, => / 3, <=> / 3, suspend : neg / 2, ic : neg / 2