From: John Cowan co...@mercury.ccil.org
Subject: Re: [Chicken-users] dynamic scoping
Date: Wed, 26 Jun 2013 20:17:38 -0400
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The related SRFI is withdrawn, is it safe to assume that fluid-let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
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
Have a look at parameter objects.
http://api.call-cc.org/doc/chicken/parameters
Evan
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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
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)
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
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The related SRFI is withdrawn, is it safe to assume that fluid-let will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)
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
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The related SRFI is withdrawn, is it safe to assume that fluid-let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 That's why they were withdrawn,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
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 -
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