Re: Metaprogramming

[Teemu Likonen <tlikonen@iki.fi>]

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Shyam Nath [2019-09-15T13:13:09+10] wrote:

> I want to redefine functions by manipulating the pre-existing
> function; is there any way to do this?

You can keep the original function code in a variable. Use that variable
to define the global function first and later all modified versions of
it.


    (defvar function-code (lambda (...) ...))
    
    (setf (symbol-function 'modifiable-function) function-code)


I think it is better to keep your defuns static and make them call
other functions which are stored in a variable or other predefined
place.


    (defvar modifiable-function (lambda (...) ...))

    (defun static-function (...)
      ;; ...
      (funcall modifiable-function ...)
      ;; ...
      )

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