On Mon, May 18, 2009 at 9:47 AM, Mark Engelberg <mark.engelb...@gmail.com> wrote: > > On Sun, May 17, 2009 at 11:48 PM, Konrad Hinsen > <konrad.hin...@laposte.net> wrote: >> It's the approach of "cloning and >> mutating" something that smells of "quick and dirty", although I >> agree it is quite convenient in the prototyping phase. > > I disagree that incremental extension of a module is a "quick and > dirty" prototyping technique, and would argue that this is a > fundamentally desirable feature. > > As an example, I authored clojure.contrib.math. Someone came up with > a slightly faster algorithm for one of the functions (which is used in > turn by other functions in the library), but I can't include it unless > he signs a contributor agreement. If he wants to create his own > version of the module for his own personal use, in which he swaps out > my function for his faster one, there appears to be no good way to do > this, short of copying my entire file, commenting out my function, and > replacing it with his. Clearly this is not an acceptable solution, > because then he won't benefit from any future updates I make to the > module. He can't use the "load" trick, all because of the (ns > clojure.contrib.math) declaration at the top of the file. > > Based on this discussion, it sounds like I (and all library authors) > should have provided all of my math functions in one file (say, > math_functions.clj), and then had a separate file (math.clj) > containing: > (ns clojure.contrib.math > (:load "math_functions")) > > just to make it possible for users to get at my code in its > uncompiled, unlinked-to-clojure.contrib.math-namespace form for the > purposes of incremental extension.
What's wrong with this: user=> (ns test (:use [clojure.contrib.math :exclude (lcm)])) nil test=> (sqrt 2) 1.4142135623730951 test=> (lcm 3 6) java.lang.Exception: Unable to resolve symbol: lcm in this context (NO_SOURCE_FILE:3) test=> (defn lcm [a b] 1) #'test/lcm test=> (lcm 3 6) 1 test=> It doesn't solve your problem with global vars, of course. -- Michael Wood <esiot...@gmail.com> --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
