[Chicken-users] ANN: eping
Hi all! those interested in network management/monitoring might find this egg useful: https://wiki.call-cc.org/eggref/4/eping Happy pinging. Ciao, Michele ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] ANN: eping
Michele La Monaca scripsit: Happy pinging. Cool! I made a minor documentation change on the wiki to encourage strings over symbols as hostnames, and to remove the suggestion to use dotted-decimal symbols like '192.168.1.1. Such a symbol violates both R5RS and R7RS, is not portable, and might stop working some day. (You could write it as '|192.168.1.1|, but that is more verbose than the string form.) -- John Cowanhttp://ccil.org/~cowanco...@ccil.org Mr. Henry James writes fiction as if it were a painful duty. --Oscar Wilde ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
[Chicken-users] dynamic scoping
add binds a to 1 at the moment of definition. #;48 (define a 1) #;49 (define (add x) (+ x a) ) #;50 (add 10) 11 #;51 (let ((a 100) ) (add 10) ) 11 Is there a way to give a different value of a to add, so that, something like this happens: (let ((a 100) ) (add 10) ) 110 Daniel ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] dynamic scoping
Have a look at parameter objects. http://api.call-cc.org/doc/chicken/parameters Evan ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] dynamic scoping
By using parameters; see also: http://api.call-cc.org/doc/chicken/parameters/make-parameter http://api.call-cc.org/doc/miscmacros/define-parameter http://api.call-cc.org/doc/chicken/special-forms/parameterize -Dan On 6/26/2013 2:47 PM, Daniel Ajoy wrote: add binds a to 1 at the moment of definition. #;48 (define a 1) #;49 (define (add x) (+ x a) ) #;50 (add 10) 11 #;51 (let ((a 100) ) (add 10) ) 11 Is there a way to give a different value of a to add, so that, something like this happens: (let ((a 100) ) (add 10) ) 110 Daniel ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] dynamic scoping
On 26/06/2013 23:47, Daniel Ajoy wrote: add binds a to 1 at the moment of definition. #;48 (define a 1) #;49 (define (add x) (+ x a) ) #;50 (add 10) 11 #;51 (let ((a 100) ) (add 10) ) 11 Is there a way to give a different value of a to add, so that, something like this happens: (let ((a 100) ) (add 10) ) 110 (define a (make-parameter 1)) (define (add x) (+ x (a))) (add 10) (parameterize ((a 100)) (add 10)) (add 10) yields 11 110 11 ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] dynamic scoping
See http://api.call-cc.org/doc/chicken/special-forms#def:fluid-let #;1 (define a 1) #;2 (define (add x) (+ x a) ) #;3 (let ((a 100) ) (add 10) ) 11 #;4 (fluid-let ((a 100) ) (add 10) ) 110 On Jun 26, 2013, at 2:47 PM, Daniel Ajoy da.a...@gmail.com wrote: add binds a to 1 at the moment of definition. #;48 (define a 1) #;49 (define (add x) (+ x a) ) #;50 (add 10) 11 #;51 (let ((a 100) ) (add 10) ) 11 Is there a way to give a different value of a to add, so that, something like this happens: (let ((a 100) ) (add 10) ) 110 Daniel ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] dynamic scoping
Oh you just had to be different. ;) The related SRFI is withdrawn, is it safe to assume that fluid-let will be available outside of Chicken? -Dan On 6/26/2013 2:56 PM, Kon Lovett wrote: See http://api.call-cc.org/doc/chicken/special-forms#def:fluid-let #;1 (define a 1) #;2 (define (add x) (+ x a) ) #;3 (let ((a 100) ) (add 10) ) 11 #;4 (fluid-let ((a 100) ) (add 10) ) 110 On Jun 26, 2013, at 2:47 PM, Daniel Ajoy da.a...@gmail.com wrote: add binds a to 1 at the moment of definition. #;48 (define a 1) #;49 (define (add x) (+ x a) ) #;50 (add 10) 11 #;51 (let ((a 100) ) (add 10) ) 11 Is there a way to give a different value of a to add, so that, something like this happens: (let ((a 100) ) (add 10) ) 110 Daniel ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] dynamic scoping
Sadly, John Cowan's fine table of SRFI support by implementation doesn't cover SRFI 15. In practice real dynamic variables - parameters - are the way to go for library or other distributed code. they are in R7RS! On Jun 26, 2013, at 3:01 PM, Dan Leslie d...@ironoxide.ca wrote: Oh you just had to be different. ;) The related SRFI is withdrawn, is it safe to assume that fluid-let will be available outside of Chicken? -Dan On 6/26/2013 2:56 PM, Kon Lovett wrote: See http://api.call-cc.org/doc/chicken/special-forms#def:fluid-let #;1 (define a 1) #;2 (define (add x) (+ x a) ) #;3 (let ((a 100) ) (add 10) ) 11 #;4 (fluid-let ((a 100) ) (add 10) ) 110 On Jun 26, 2013, at 2:47 PM, Daniel Ajoy da.a...@gmail.com wrote: add binds a to 1 at the moment of definition. #;48 (define a 1) #;49 (define (add x) (+ x a) ) #;50 (add 10) 11 #;51 (let ((a 100) ) (add 10) ) 11 Is there a way to give a different value of a to add, so that, something like this happens: (let ((a 100) ) (add 10) ) 110 Daniel ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] dynamic scoping
Dan Leslie scripsit: The related SRFI is withdrawn, is it safe to assume that fluid-let will be available outside of Chicken? The implementation of fluid-let is trivial, provided you don't have more than one thread to deal with. That's why they were withdrawn, bad behavior when multiple threads are involved. Parameters have their own problems, especially when mutated rather than rebound, but they're an advance on fluid-let. -- John Cowan co...@ccil.org http://ccil.org/~cowan Micropayment advocates mistakenly believe that efficient allocation of resources is the purpose of markets. Efficiency is a byproduct of market systems, not their goal. The reasons markets work are not because users have embraced efficiency but because markets are the best place to allow users to maximize their preferences, and very often their preferences are not for conservation of cheap resources. --Clay Shirky ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] dynamic scoping
Kon Lovett scripsit: Sadly, John Cowan's fine table of SRFI support by implementation doesn't cover SRFI 15. When I did it, I wasn't dealing with withdrawn SRFIs. As I just said, fluid-let's definition is highly portable in a single-threaded context. In practice real dynamic variables - parameters - are the way to go for library or other distributed code. they are in R7RS! Yes, indeed. Also unlike fluid-let, parameters are first class objects. -- With techies, I've generally found John Cowan If your arguments lose the first round http://www.ccil.org/~cowan Make it rhyme, make it scan co...@ccil.org Then you generally can Make the same stupid point seem profound! --Jonathan Robie ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
