Example use of macro to minimize and generalize the code (2)

[Jean Louis <bugs@gnu.support>]

* Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2021-05-31 22:21]:

> What kind of things or problems could or should you solve with
> macros?

Another good use of a macro is with the database application where:

- database user can define the type of the object, for example,
  database user "joe" could create new type named "bc evaluation"

- the type of the object is accessible to user only, not to other
  users; 

- user edits the type and declares that the value should be evaluated
  with the external program named "bc". Such declaration could be
  simple "bc" instead of complex programming

- macro generates a function specific for that user who needs to see
  the output from "bc evaluation"

Thus it becomes a program that develops itself further based on
users's input. 

-- 
Jean

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