On Jan 21, 11:48 pm, Mark Engelberg mark.engelb...@gmail.com wrote:
Thanks for the thread links. This is basically what I suspected -- if
you want to use structs in multimethods, you have to roll your own
constructor which adds some kind of type tag to either the hashmap
or the metadata.
On 22.01.2009, at 07:48, Mark Engelberg wrote:
Is there any way to determine whether something is a struct (versus
an ordinary hash map), and if so, determine which kind of struct it
was built from?
Not that I know. I have been searching for a while, and ended up
using my own tag attached
Finally started a GitHub repo just for this project.
http://github.com/swannodette/cljos/tree/master
The earlier version of course was very flawed/buggy. OK start, but the
macros in it were written with little/no understanding about how symbols are
resolved into their namespaces in Clojure (or
I am not entirely happy with this approach though. If everyone starts
to use metadata for various purposes, such type tags may well
disappear by some function replacing the metadata on an object
without preserving the tags that are already there. This is all the
more likely because there is
Konrad Hinsen a écrit :
there is nothing in the standard library to add a
tag to an existing metadata map. All there is is (with-meta ...),
which replaces the metadata map completely.
It itched me before and since there's already alter-meta! maybe there
should also be an alter-meta
On 22.01.2009, at 09:30, Konrad Hinsen wrote:
Not that I know. I have been searching for a while, and ended up
using my own tag attached to the struct as metadata. In clojure.zip
there is a similar use of metadata: methods are implemented as
functions passed in the metadata.
After a quick
On Jan 21, 9:39 pm, Frank ffai...@gmail.com wrote:
I am interested in trying to use Clojure to develop web-based
applications. Can someone point me to any Clojure libraries that have
been written that I can use. Thanks.
There's Compojure, which looks like this:
(defservlet demo-servlet
On 22.01.2009, at 10:51, Konrad Hinsen wrote:
At the end of this message is a simple illustration of what can be
done with these changes. Any feedback is welcome of course!
Maybe I should reply immediately to some objections I expect to come:
1) Why create a secondary type system around
Thanks Tim, I'll have a look at that.
To clarify my use case, I was thinking of events that can be processed
sequentially but that may take a non-trivial amount of time to
complete (both CPU and IO bound at different stages of processing) so
it's ideal to have a thread pool to process different
Hi Meikel,
On Jan 21, 3:01 pm, Meikel Brandmeyer m...@kotka.de wrote:
There was a breakage some time ago, which made it necessary
to release a bug fix release. The revisions are named on the
vim.org page, where you can download Gorilla. Please check
there if this solves your problem. If not,
On Jan 22, 12:53 am, Mark H. mark.hoem...@gmail.com wrote:
On Jan 21, 5:21 pm, e evier...@gmail.com wrote:
I would think it would be useful to have something exactly like a stream but
that allowed as many iterators as you like but that a mutex prevented any
two from consuming the same
Now imagine two threads T1 and T2 accessing this generator at the same
time. Suppose they reach the same node at the same time, and suppose
that you've protected file deletion and link deletion each
individually with a mutex (and forbade multiple deletions silently).
T1 might delete the
I like the example, and I should be able to adapt it. I do have one
question about the example (probably not related to agents:
; queue up some work to be done
(defn add-job [func]
(let [a (agent nil)]
(send a (fn [_] (func)))
(swap! jobs #(conj %1 a
What is the notation fn [_]? I
On 21.01.2009, at 20:33, Rich Hickey wrote:
I've started documenting the streams work I have been doing, for those
interested:
http://clojure.org/streams
Nice!
I have played a bit with the stream implementation, and I came across
a behaviour that I do not understand:
First, define a
On Jan 22, 4:46 am, Christophe Grand christo...@cgrand.net wrote:
Konrad Hinsen a écrit : there is nothing in the standard library to add a
tag to an existing metadata map. All there is is (with-meta ...),
which replaces the metadata map completely.
It itched me before and since there's
Hi Rich,
It is a small real problem: in the book I demonstrate an incorrect,
stack-consuming recursion that blows up on a deeply nested structure.
When the recursion is fixed, it *still* blows up because the REPL
cannot print it, so I introduce *print-level*.
I don't think printing
On Thu, Jan 22, 2009 at 2:52 PM, Greg Harman ghar...@gmail.com wrote:
I like the example, and I should be able to adapt it. I do have one
question about the example (probably not related to agents:
; queue up some work to be done
(defn add-job [func]
(let [a (agent nil)]
(send a (fn
On Jan 22, 2:48 am, Mark Engelberg mark.engelb...@gmail.com wrote:
Thanks for the thread links. This is basically what I suspected -- if
you want to use structs in multimethods, you have to roll your own
constructor which adds some kind of type tag to either the hashmap
or the metadata.
On Thu, Jan 22, 2009 at 2:18 PM, Rich Hickey richhic...@gmail.com wrote:
Those are important things to think about.
There are, in fact, thread semantics for the streams mechanism, as for
the rest of Clojure. Currently, I've made it such that the stream/iter/
seq combination ensures
I'd suggest using Compojure for your first project - its fairly widely
used, is easy to pick up, and has a growing set of docs.
I'm not sure that Webjure is maintained anymore (i.e. no commits to
its repo in a few months).
Weld is still a work in progress - I'm trying to stabilize it now but
it
On 22.01.2009, at 15:26, Rich Hickey wrote:
It's pretty easy to write a trivial struct system, much harder to
address performance, interop, compilability, dynamicity etc
constraints.
Indeed.
As a simple case, if a defstruct is re-evaluated, will objects created
after that be of the same
On Jan 22, 9:08 am, Konrad Hinsen konrad.hin...@laposte.net wrote:
On 21.01.2009, at 20:33, Rich Hickey wrote:
I've started documenting the streams work I have been doing, for those
interested:
http://clojure.org/streams
Nice!
I have played a bit with the stream implementation, and
(both CPU and IO bound at different stages of processing) so
it's ideal to have a thread pool to process different tasks in
parallel, even though they are independent.
If you use the agents, the underlying implementation uses two thread
pools:
(1) static relative to your processors, use send
On 22.01.2009, at 16:27, Rich Hickey wrote:
Now it works - fine. But what happened to the seq that now owns the
stream? Nothing refers to it, so it should be gone.
No, the stream must refer to it, in order to keep its promise to
return the same seq every time.
OK.
Did it perhaps
Hi Frank,
I'd also recommend looking at Restlet http://www.restlet.org/ and
the Java Servlets API.
-Stuart Sierra
On Jan 21, 4:39 pm, Frank ffai...@gmail.com wrote:
Hi,
I am interested in trying to use Clojure to develop web-based
applications. Can someone point me to any Clojure libraries
On Thu, Jan 22, 2009 at 12:33 AM, Allen Rohner aroh...@gmail.com wrote:
Chouser, how usable is clojurescript to generate extremely simple
javascript calls? When creating HTML templates, I find myself using
ugly string interpolation to generate the .js. I would really love it
if I could do
Tim,
Could you explain atoms the way you explained agents?\
Emeka
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http://lispnyc.org/soc2009.clp
Forget most of what I said, it seems the BDFL already has these things in
mind ;) Enough of types and structs for me, time for me dive into the less
familiar territory of Clojure.
On Thu, Jan 22, 2009 at 12:25 PM, David Nolen dnolen.li...@gmail.comwrote:
Can't
On Jan 21, 2:33 pm, Rich Hickey richhic...@gmail.com wrote:
I've started documenting the streams work I have been doing, for those
interested:
Cool! 3 questions:
1. Can you feed things into a stream?
2. Could streams be used for I/O?
3. Can streams have clean-up/close code when they are
Hi,
Am 22.01.2009 um 18:25 schrieb David Nolen:
Can't some elements of the problem be solved with some form of
predicate dispatching as proposed by Meikel? Predicate dispatching
would allows us to use _anything_ as a type (i.e. structs
themselves), as well as allowing user defined
Here's a dumb question which has been answered before... but I can't
find it in the docs.
How does one find out the file and line number upon which a symbol was
defined? I want to use it for go-to-defintion in the IntelliJ plugin.
Also, is there any way to find all the code that is
On Thu, Jan 22, 2009 at 1:20 PM, Peter Wolf opus...@gmail.com wrote:
Here's a dumb question which has been answered before... but I can't
find it in the docs.
user= (map (meta (var take)) [:file :line])
(core.clj 1434)
Which is to say, the file and line number are stored in the metadata of
On Jan 22, 2009, at 11:17 AM, Konrad Hinsen wrote:
On 22.01.2009, at 16:27, Rich Hickey wrote:
Now it works - fine. But what happened to the seq that now owns the
stream? Nothing refers to it, so it should be gone.
No, the stream must refer to it, in order to keep its promise to
return
On Jan 22, 2009, at 12:36 PM, Stuart Sierra wrote:
On Jan 21, 2:33 pm, Rich Hickey richhic...@gmail.com wrote:
I've started documenting the streams work I have been doing, for
those
interested:
Cool! 3 questions:
1. Can you feed things into a stream?
Yes, you can put a generator on
Suppose I have a clojure file called app.clj that contains something
like:
(ns app)
(defn foo [] (println hello))
(defn reader [filename] (load-file filename))
and a file called data that simply contains
(foo)
What I would like to see, from the REPL, is:
user= (load-file app.clj)
user=
On Jan 22, 2009, at 12:46 PM, Paul Henning wrote:
As described, this doesn't work. load-file looks up symbols in the
current namespace (user in this case), but foo is interned in app.
At some point in this process, Clojure needs to know which foo you're
talking about. It can't retrieve
At some point in this process, Clojure needs to know which foo you're
talking about. It can't retrieve the var associated with foo without
knowing which namespace it's in. That determination can either be
explicit or it can be made via the current namespace (*ns*), but it
has to be
Hello,
Here is how I get an hierarchical data structure of information on ns
in clojure-dev :
The tree has really just 3 levels : one root node representing all ns,
one child node of the root node representing one ns each, one child
node per ns node for ns interned symbols.
Each node is
This is a rejuvenation of the old calling Java from Clojure thread
I have been looking at the solutions from Mark
/
1) From a Java application, read a text file containing Clojure code
and invoke specific functions it defines from Java code.
2) Compile Clojure code to bytecode and use
On Jan 22, 2009, at 3:56 PM, Paul Henning wrote:
As long as no one cares if I muck with *ns*, I can make it work [...]
That brings up an important point. The var *ns* may look like a global
variable in C++, but it's really a dynamic variable--something quite
a bit safer and more
Thanks to everyone for their responses. I will be looking into all
these libraries. I wanted to add two other references to this thread
that I will also be researching. I found two libraries written by
Christophe Grand:
Ring - http://github.com/mmcgrana/ring/tree/master
Enlive -
On Thu, Jan 22, 2009 at 4:43 PM, Peter Wolf opus...@gmail.com wrote:
This is a rejuvenation of the old calling Java from Clojure thread
I have been looking at the solutions from Mark
/
1) From a Java application, read a text file containing Clojure code
and invoke specific functions it
Peter,
A weird thing seems to happen often those days, and I have remarked
it's related to you.
You start a new post, but it appears to be in the continuation of a
previous one, with the subject changed.
This does not look good to me. Are you doing something like this to
start a new post :
On Jan 22, 10:15 pm, Frank ffai...@gmail.com wrote:
I found two libraries written by Christophe Grand:
Only Enlive was written my Christophe; Ring was written by Mark. From
what I gather Ring is an abstraction layer like Rack, and isn't
designed to be used directly to build web applications.
Hi folks,
Is there any way to make a function that takes primitive parameters?
It seems you can't, but I might be missing something.
I have the following code (a start to playing with mandelbrot sets):
(defn step [x0, y0, xn, yn]
(let [xm (+(-(* xn xn)(* yn yn)) x0)
ym (+(* 2 xn yn)
Ooops! How embarrassing :-(
Yes, that's exactly what I am doing. It did not occur to me that there
is extra information embedded in the reply that marks it as being part
of a thread.
Sorry, won't happen again
P
lpetit wrote:
Peter,
A weird thing seems to happen often those days, and
Thanks for the lengthy reply Laurent, Replies in-line
lpetit wrote:
Peter,
We asked us the same question some weeks ago, on clojuredev.
We took the path to follow how eclipse launches a java application
when the user requires it to test it.
So we created a customized launch configuration
Hi,
Here is def of merge:
(defn merge
[ maps]
(when (some identity maps)
(reduce #(conj (or %1 {}) %2) maps)))
How can I interpret when (some identity maps)?
Thanks
-sun
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wow. I wonder if I could use this for the quicksort I was talking about. I
would need to have the function being added as a job be able to add it's own
jobs recursively . . . .and kill jobs when they are done. But do you have
to sleep, or is there a way to join the children when they are done?
Hi,
It means that some of the maps can be nil, but at least one of them
has to be non-nil. some requires a predicate, but since nil is
logical false, we can just use identity. Here's the behavior:
user (merge nil nil nil)
nil
user (merge {:a 1} nil {:b 2})
{:b 2, :a 1}
-Stuart
On Jan 22, 6:51 pm, Peter Wolf opus...@gmail.com wrote:
However, if there is only one Clojure image used for references and the
like, what happens if someone calls an infinite loop, or infinite
recursion, in a file. Does the Clojure server hang/blow up?
If you code an infinite loop, the
On Jan 21, 1:33 pm, Rich Hickey richhic...@gmail.com wrote:
I've started documenting the streams work I have been doing, for those
interested:
http://clojure.org/streams
Feedback welcome,
Rich
This work reminds me in a general way of the old Dylan iteration
protocol. They're not the
On Jan 19, 12:38 am, David Nolen dnolen.li...@gmail.com wrote:
Of course it might be the case that not many people are interested in the
implementing ideas from CLOS for Clojure
It's definitely interesting. I'd like to have eql specializers and the
ability to build hierarchies of arbitrary
On Jan 22, 4:24 pm, e evier...@gmail.com wrote:
At first, there will only be one thread for the first pass, but the number
will grow as subtasks fire sub-sub tasks. I am sure this is a silly way to
sort because the threadspawning time is so much longer than the filtering
time, but it's just
Under the suggestion of some people in the #clojure channel, I started
working on a date library for Clojure since the built-in Java one is
kind of a mess. It's not totally complete, but I think it could be
quite useful. It supports getting the current date and time, and
creating dates based on
By the way, I'm in the process of sending in my contributor agreement.
Just so you know :)
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[sorry for duplicating content from the email i sent you David]
Would anyone be interested in simplifying some of the boilerplate for
defining methods in clojs? Currently you have to do this,
(defclass circle [shape]
(:radius 10))
(defmulti area :tag)
(defmethod area ::circle [this] (*
That sounds interesting; you might take a look at Joda
Timehttp://joda-time.sourceforge.net/.
Although I've never used it myself, from what I've heard it's the Java
library that people actually use for dates/times (I do know that Google uses
it). Doing a quick search, it looks like Mark
We discussed Joda Time, but it was decided that it wasn't a good idea
to add another dependency, since this is something so integral to the
language. I don't know what other people think, though. This was just
an informal decision on #clojure.
On Jan 23, 12:05 am, Nick Vogel voge...@gmail.com
Hi folks;
Is there any way to get an updated dump of clojure.org as a pdf file?
I like to print out stuff and read it on the train, and the
clojure_manual.pdf available on the google groups site is a tad old,
good for an introduction, but I'd like to read the bleeding edge stuff
off-line.
-
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