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# neg(?Expr, ?Bool)

Reified boolean operation
*Expr*
- An arithmetic expression
*Bool*
- Variable, 0 or 1

## Description

Reified version of neg/1, i.e. the truth value of the boolean operation
is reflected in the value of the 0/1 variable Bool.
This constraint suspends until its first argument is ground.
It then unifies Bool according to the truth value of the corresponding
neg/1 constraint.

### Modules

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

*(24) number expected *
- Expr is not an arithmetic expression.

## See Also

neg / 1