[alexandria-devel] EXTREMUM

[Tobias C Rittweiler]

The cl-utilities library contains one function which cannot be
found in alexandria that necessity pops up every now and then:

  Returning the maximum (or minimum) element in a sequence
  with respect to an arbitrary calculation involving the elements.

I.e.

  (elt (sort (copy-sequence <SEQUENCE>) #'< :key <FUNCTION>) 0) ; or #'>

except doing it more efficiently.

CL-UTILITIES calls this function EXTREMUM. (It also provides a couple
of more functions along the lines to cover some edge cases.)

The code can be found here:
 
http://common-lisp.net/viewvc/cl-utilities/cl-utilities/extremum.lisp?rev
ision=1.10&view=markup

As the code is Public Domain, it could just be moved as is.


I find no other use of cl-utilities and would like to see it
become entirely obsolete.

T