category

# `observer`

Smalltalk dependent protocol.

Author: Paulo Moura
Version: 1.0
Date: 2003/2/9
Compilation flags:
`static`

(no dependencies on other entities)

## Public interface

### `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 interface

(none)

## Private predicates

(none)

## Operators

(none)

## Remarks

(none)

See also

subject