Ah, okay, I see the idea. I'm not sure why it doesn't work.
For now, I think, using an atom and reset! seems to do the job!
Phil
atkaaz <atk...@gmail.com> writes:
> The following idea came to me in the shower, sort of out of the blue, and I
> don't know why I didn't think of it before(I'm disappointed with myself)
> so, why not use the same thing as clojure does? even though it does it in
> java, you can do it in clojure, the only thing is that you have to do it
> once, probably where you define the var, such as(well unfortunately it
> doesn't work O_o maybe someone can explain?):
> (I was gonna try java interop but I notice there's *
> clojure.core/push-thread-bindings*)
>
> =>* (def ^:dynamic *test4* false)*
> #'cgws.notcore/*test4*
> => *(push-thread-bindings {#'*test4* true})*
> nil
> => **test4**
> *false*
> => (pop-thread-bindings)
> nil
> => *test4*
> false
>
> => (def ^:dynamic a 1)
> #'cgws.notcore/a
> => (push-thread-bindings {#'a 2})
> nil
> => a
> 1
> => (set! a 3)
> IllegalStateException Can't change/establish root binding of: a with set
> clojure.lang.Var.set (Var.java:233)
>
> (defn *push-thread-bindings*
> "WARNING: This is a low-level function. Prefer high-level macros like
> binding where ever possible.
>
> Takes a map of Var/value pairs. Binds each Var to the associated value for
> the current thread. Each call *MUST* be accompanied by a matching call to
> pop-thread-bindings wrapped in a try-finally!
>
> (push-thread-bindings bindings)
> (try
> ...
> (finally
> (pop-thread-bindings)))"
> {:added "1.1"
> :static true}
> [bindings]
> (clojure.lang.Var/pushThreadBindings bindings))
> nil
>
> =>* *clojure-version**
> {:interim true, :major 1, :minor* 6*, :incremental 0, :qualifier "master"}
>
>
> so if this worked as I expected then the following two statements would be
> in the same place:
> => (def ^:dynamic *test1*)
> #'cgws.notcore/*test1*
> => (push-thread-bindings {#'test1 "default value here"})
> nil
>
> ;and the third could be anywhere (in current thread, 'cause just as
> clojure's *warn-on-reflection* when on a different thread you still can't
> set! it)
> => (set! test1 "user value")
> IllegalStateException Can't change/establish root binding of: test1 with
> set clojure.lang.Var.set (Var.java:233)
>
> *So, is **push-thread-bindings broken(unlikely) or am I missing
> something(most certainly so) ?*
>
>
>
> On Fri, May 17, 2013 at 6:49 PM, Phillip Lord
> <phillip.l...@newcastle.ac.uk>wrote:
>
>> Jim <jimpil1...@gmail.com> writes:
>>
>> > On 17/05/13 11:00, Phillip Lord wrote:
>> >> It's a nice language, I think. It inherits however the some of the
>> >> nastiness of Java, in particular it doesn't integrate at all into the
>> >> OS; the makes it not a good fit for little scripting, one-off jobs which
>> >> form the basis of a lot of scientific computing.
>> >
>> >
>> > aaa yes indeed...the jvm is indeed very heavy-weight for such scripting
>> > tasks...on the other hand have you looked at clojure-py? I'm not
>> up-to-date
>> > with its current state/features but it should be viable for little
>> scripting
>> > jobs... :)
>>
>>
>> Well, I an proficient in python, so it's probably easier just to use
>> python. Even if the documentation sucks.
>>
>>
>> >> Which gives me the dynamic scoped behaviour, but not the global
>> >> resetting behaviour.
>> > I quickly wrote the following but I get an exception which I
>> > don't have the time to sort at the moment...maybe later this evening...
>> :)
>>
>>
>> It's okay! I have a workable solution now, even if it still seems a
>> little unfair that I cannot take the same approach that clojure.core
>> does under the same circumstances!
>>
>> Phil
>>
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>
> --
--
Phillip Lord, Phone: +44 (0) 191 222 7827
Lecturer in Bioinformatics, Email: phillip.l...@newcastle.ac.uk
School of Computing Science,
http://homepages.cs.ncl.ac.uk/phillip.lord
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