Advice (programming): Difference between revisions

Revision as of 02:13, 28 March 2024

Latest revision as of 14:09, 12 August 2025

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<syntaxhighlight lang="elisp">

(advice-add #'ispell-word

:after #'flyspell-buffer)

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:Advising is the basic innovation in the model, and in the PILOT system. Advising consists of inserting new procedures at any or all of the entry or exit points to a particular procedure (or class of procedures). The procedures inserted are called "advice procedures" or simply "advice".

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:Since each piece of advice is itself a procedure, it has its own entries and exits. In particular, this means that the execution of advice can cause the procedure that it modifies to be bypassed completely, e.g., by specifying as an exit from the advice one of the exits from the original procedure; or the advice may change essential variables and continue with the computation so that the original procedure is executed, but with modified variables. Finally, the advice may not alter the execution or affect the original procedure at all, e.g., it may merely perform some additional computation such as printing a message or recording history. Since advice can be conditional, the decision as to what is to be done can depend on the results of the computation up to that point.

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:The principal advantage of advising is that the user need not be concerned about the details of the actual changes in his program, nor the internal representation of advice. He can treat the procedure to be advised _as''as a unit_unit'', a single block, and make changes to it without concern for the particulars of this block. This may be contrasted with editing in which the programmer must be cognizant of the internal structure of the procedure.

"Advising" found its way into [[BBN Lisp]] and later into [[Xerox PARC]]'s [[Interlisp]].

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* [http://www.ai.mit.edu/research/publications/browse/0200browse.shtml Teitelman's PhD thesis, PILOT: A Step Toward Man-Computer Symbiosis] (AITR-221)

* [http://bitsavers.informatik.uni-stuttgart.de/pdf/xerox/interlisp/Interlisp_Reference_Manual_1974.pdf Interlisp reference manual] from 1974

* [httphttps://p-cos.blogspot.com/2007/12/origin-of-advice.html "Origin of Advice"]

{{aosd}}