Hi,
On Aug 10, 9:10 pm, jvt wrote:
> Be this as it may, you can still get weird run-time behavior from this
> kind of macro in the following situation:
>
> (def *v1* 10)
> (def var-map {:*v1* 100})
> (def wrong-map {:*v2* 10})
>
> (with-bindings-from-map var-map (+ v1 100)) ; -> 200, does what
I'm also concerned about the implementation, which seems to rely on
what appears to me to be a little magical. An alternative that I was
considering was to just break backwards compatibility and combine all
of the variables into one variable containing a map in a new major
version of my library. B
Really, this should be
(with-bindings-from-map var-map (+ *v1* 100)) ; -> 200, does what we
expect
(with-bindings-from-map wrong-map (+ *v1* 100)) ; -> 110, does the
wrong thing entirely, silently
Anyway, you may want to think about why common-lisp does not have a
with-all-slots macro for use
Meikel,
What concerns me is that this macro lets you write code which depends
on names which are not present at compile time (someplace). Coming
from scheme, not only would you _not_ do this, but you _can't_ do it
without using eval in your macro body, which is considered bad form.
That we can d
On Thu, Aug 6, 2009 at 10:12 PM, samppi wrote:
>
> I have about six variables that are often rebound together using
> binding; these variables are used to access and set data in a state
> object (whose type is of the user's choice). These variables' values
> (the accessors and setters) are often
Hi,
Am 10.08.2009 um 03:24 schrieb jvt:
(defmacro with-a-b-c [m & body] `(let [mp# ,mp] a (:a mp#) b (:b mp#)
c (:c mp#)] ~...@body))
Is this a more "idiomatic" solution or a more "lispy" one, or am I
laboring under a misunderstanding?
I find this not very elegant. Tomorrow you need b, c and
When I encountered this post, my instinct was to suggest that he write
a specific macro to bind these particular variables rather than depend
on magic to make new bindings at run-time from symbols known only at
run-time, a la:
(defmacro with-a-b-c [m & body] `(let [mp# ,mp] a (:a mp#) b (:b mp#)
On Sat, Aug 8, 2009 at 9:52 AM, Rich Hickey wrote:
>
> On Sat, Aug 8, 2009 at 5:53 AM, Meikel Brandmeyer wrote:
> > Hi,
> >
> > Am 08.08.2009 um 02:52 schrieb samppi:
> >
> >> Great, thanks. Is clojure.lang.Var/pushThreadBindings a public,
> >> supported part of the API? Can I use it without fear
Hi,
Am 08.08.2009 um 15:52 schrieb Rich Hickey:
get-/push-/pop-thread-bindings wrapping Var.get/push/popThreadBindings
would be a welcome issue/patch.
Note the addition of getThreadBindings(), which returns a map of all
the current bindings. This could be used to define a
function-returning ma
On Sat, Aug 8, 2009 at 5:53 AM, Meikel Brandmeyer wrote:
> Hi,
>
> Am 08.08.2009 um 02:52 schrieb samppi:
>
>> Great, thanks. Is clojure.lang.Var/pushThreadBindings a public,
>> supported part of the API? Can I use it without fear of suddenly
>> dropped support?
>
> It is was `binding` uses intern
Hi,
Am 08.08.2009 um 02:52 schrieb samppi:
Great, thanks. Is clojure.lang.Var/pushThreadBindings a public,
supported part of the API? Can I use it without fear of suddenly
dropped support?
It is was `binding` uses internally. Unfortunately
this is not exported by Clojure's public API. I -
unf
Great, thanks. Is clojure.lang.Var/pushThreadBindings a public,
supported part of the API? Can I use it without fear of suddenly
dropped support?
On Aug 6, 10:56 pm, Meikel Brandmeyer wrote:
> Hi,
>
> On Aug 7, 7:12 am, samppi wrote:
>
> > So is this possible without arcane stuff?
> > Inhttp:/
Hi,
On Aug 7, 7:12 am, samppi wrote:
> So is this possible without arcane stuff?
> Inhttp://groups.google.com/group/clojure/browse_thread/thread/23fe1a5c9...,
> I asked about using a macro to do this, and the consensus seems to be
> that it's possible with magic, but it's generally a bad idea.
I have about six variables that are often rebound together using
binding; these variables are used to access and set data in a state
object (whose type is of the user's choice). These variables' values
(the accessors and setters) are often used together.
I'd like to be able to bundle these values
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