category

# `observer`

Smalltalk dependent protocol.

Availability:
`logtalk_load(dependents(loader))`
Author: Paulo Moura
Version: 1:0:0
Date: 2003-02-09
Compilation flags:
`static`
Dependencies:
(none)
Remarks:
(none)
Inherited public predicates:
(none)

## Public predicates

### `update/1`

Called when an observed object is updated.

Compilation flags:
`static`
Template:
`update(Change)`
Mode and number of proofs:
`update(?nonvar)` - `zero_or_one`

## Protected predicates

(none)

## Private predicates

(none)

## Operators

(none)

See also

subject