GBBopen 1.5 Reference -- describe-instance-slot-value

describe-instance-slot-value

describe-instance-slot-value unit-instance slot-name value &optional stream [Generic Function]

Purpose
Customize slot-value printing by describe-instance.

Method signatures

describe-instance-slot-value (unit-instance standard-unit-instance) slot-name value &optional stream

Package :gbbopen

Module :gbbopen-core

Arguments and values

unit-instance		A unit instance (or space instance)
slot-name		A non-`nil`, non-keyword symbol
value		An object
stream		A stream (default is `standard-output`)

Description
Describe-instance-slot-value is called by describe-instance to print each slot value; it should not be called directly. The slot-value representation is printed to the output stream.

See also
describe-instance

Example
Describe the observation-duration slot of a hyp unit instance as a human-readable duration:

  (defmethod describe-instance-slot-value
      ((hyp hyp)
       (slot-name (eql 'observation-duration)) value
       &optional (stream *standard-output*))
    (if value
        (pretty-duration duration 5 stream)
        (prin1 nil stream)))

The GBBopen Project

describe-instance-slot-value