Seems like the expansion is trying to put the function's value in there,
and this has already been compiled. If the function' code is expanded
in-place it works.
user=> (defmacro bar
[a]
(let [b (keyword a)
f `(fn [& args#] ~b)]
`(deftype ~a []
clojure.lang.ILookup
Flatten isn't the problem. You can't put together a special form with
apply. Try taking the class name as a symbol or string and use reflection.
On Wednesday, April 18, 2012 1:57:27 PM UTC-7, Thomas wrote:
>
> Hi,
>
> I'd like to write a macro which transforms
>
> (my-macro SomeClass. a b [x y] c
You could keep the board in an atom so it can mutate; then try to find
maybe two good places for mutation to happen, your move and the program's.
With the rest being functional you'll avoid the problems of global state
while not being forced to fit your logic into a loop of some re-binding
that
It's the other way around: false is boxed into Boolean/FALSE. Here's the if
stmt:
public Object eval() {
Object t = testExpr.eval();
if(t != null && t != Boolean.FALSE)
return thenExpr.eval();
return elseExpr.eval();
}
On Friday, April 13, 2012 12:45:02 PM UTC-7, Andy Fingerhut wrote:
>
> One li
>
> > 'false' is a clojure built-in,
>
> false and true are JVM built-ins.
>
LOL. Don't let him get away with anything!
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Maybe walking the result of
(read-string (str "(" (slurp "somefile.clj") ")"))
On Wednesday, April 11, 2012 9:20:31 AM UTC-7, Mark Fredrickson wrote:
>
> Hello,
>
> I have a web survey/survey experiment written in Clojure. The survey is
> currently in English and needs to be translated into Fren
>
> Is there a way to capture those kind of bugs earlier?
>
For each namespace I get a fresh repl and (use) the one in turn, then try
the whole program.
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an be the simpler, better
choice.
On Tuesday, March 27, 2012 12:25:16 PM UTC-7, David Nolen wrote:
>
> On Tue, Mar 27, 2012 at 3:12 PM, Armando Blancas wrote:
>
>> If anything, the java-in-parens gvec.clj *proves* how difficult it is to
>> get Java perf in Clojure. Th
You can spot a weak argument when euphemisms and stuff we are
yet-to-encounter start to pop up.
I find puzzler's experience exactly to mine, point by point, and given the
little talk of multi-threading coding in this board I'd expect the same to
apply to many others. If anything, the java-in-pa
An alternative to the complexities involved may be to write
number-crunching hot spots in Java. Thus I'd add to Tip 10 that it ain't so
bad if you exploit some JVM-platform-goodness *you* just wrote; by
definition it's not much code, it's much simpler and can be done in a
functional style.
On
>
> If invalid input will not throw an error
> immediately, then it DOES need to be documented that invalid input
> will result in undefined output.
>
> ~Justin
>
Documented by whom? By you and FrankS? Maybe the push back is for lotta
suggestin' but little doin'.
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You received this message be
(extend-type clojure.lang.IPersistentVector
> Fixo
> (fixo-push [vector value]
>(conj vector value)))
> [should FAIL - protocol name not allowed here unless all methods are
> implemented]
>
> => (extend-type clojure.lang.IPersistentVector
> nil
>
(Don't know why I can only respond to the first message.)
I come across partial implementation all the time, and with proxy, too. In
Eclipse this is so common that this is typical:
"This adapter class provides default implementations for the methods
described by the SelectionListener interface.
>
> user=> (boom (Record.))
> AbstractMethodError user.Record.boom()Ljava/lang/Object; user/eval55
> (NO_SOURCE_FILE:3)
>
> Apparently, types/records can implement a protocol "in name only."
>
That can't in name only since you obviously got an implementation, though
abstract.
> What is b
>
> What should I be using to check that the symbol .firstName and
> .fullName are defined in the current scope?
>
"fullName" is easier because it gets interned in the current namespace:
user=> (ns-interns 'user)
{fullName #'user/fullName, ->Person #'user/->Person,
> Can you provide some more specific examples of what's missing?
Surely you're joking, Mr. Hagelberg.
> I don't know any Java and was able to manage pretty well.
This is no time for modesty, lest the OP might feel his troubles
aren't even valid. Perhaps better to say that a rudimentary grasp of
eval doesn't mind lazy seqs as input:
user=> (map identity ['quote ()])
(quote ())
user=> (class (map identity ['quote ()]))
clojure.lang.LazySeq
user=> (eval (map identity ['quote ()]))
()
But it can't handle a form that contains an (evaluated) empty lazy
seq. Another example:
user=> (eval `(quo
Not sure if I understand your concern since I wonder how's that
different from, say, some ephemeral Java collection that happens to be
around after a given generational threshold and then becomes
unreachable.
On Feb 10, 4:01 am, pron wrote:
> And have you profiled the objects making it to the old
Well, you can always use the (time) macro and pick what runs faster:
(dorun (map some-fn-with-side-effects sequence-1 sequence-2))
(doseq [x (map some-fn-with-side-effects sequence-1 sequence-2))])
(doseq) could be faster in some cases because its implementation uses
chunked sequences. Now, (dos
Can you point to where that's happening? I can only see an iteration
of next over the sequence returned by map.
On Jan 23, 6:43 am, "Meikel Brandmeyer (kotarak)"
wrote:
> And (dorun (map )) is creating a cons with a random value (most likely nil)
> and traverses it and throws it away at every seq
user=> (first (read-string x))
a
On Jan 10, 12:36 pm, Bartek wrote:
> hello everyone,
>
> It's true that:
>
> (first '(a b))
> is:
> a
>
> And now I have:
>
> (def x "(a b)")
>
> How can I use 'x' as S-expression like in the example above?
>
> (first (>>some-functions<< x))
> and should give:
> a
> However, let's turn it around for a
> moment and ask another question: why is it that some newcommers year after
> year think that the choice of this syntax is arbitrary?
Some people come with lots of baggage from other languages they like.
That's why various complaints and proposals are so sup
If foo is their only caller, bar and baz can be locals inside foo and
thus giving baz direct access to foo's params. Checkout (letfn):
http://clojuredocs.org/clojure_core/1.2.0/clojure.core/letfn
On Dec 2, 7:34 pm, Jim Crossley wrote:
> Hi,
>
> I have a public function foo that uses two private f
Here's a patch:
http://code.google.com/p/clojure-jsr223/downloads/list
Feel free to file bugs here:
http://code.google.com/p/clojure-jsr223/issues/list
On Nov 13, 9:52 am, Francesco wrote:
> I was trying to write a simple script attribute definition for
> shibboleth as
> in:https://wiki.shibbol
The compile call is a no-op and makes no difference since the engine
evaluates the script. That looks like a bug in getAttribute(). I use
put and get from the engine directly and may have overlooked something
in the attr calls. I'll upload a fix in google code asap.
On Nov 13, 9:52 am, Francesco
There are two libs with that name; I maintain the one in google code.
In case that's the one you found, here's a status.
It supports the spec, but there are two differences described in
issues #4 and #5 (#3 is fixed) that arise from the spec's assumption
that you'll use an interpreter.
Works with
> (because test cases are written by the coder who has a
> specific intention in mind)
>
Good observation. When I see figures of tests coverage I wonder how
many flow paths aren't being covered simply because they don't exists
but they should.
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With 1.3/OSX this code worked up to:
user=> (sqrt 1)
100.0
and then hanged here:
user=> (sqrt 10)
~ $
On Oct 13, 7:04 pm, "Alan O'Donnell"
wrote:
> Hi everyone,
>
> I've encountered an unexpected NullPointerException while translating
> some early SICP code into Clo
> Seems to me that if you're going to use metadata to communicate intention
> about dynamic binding in *one* way of creating a new var, you should do it
> with *all* ways of creating a new var.
And you may be right. My point was that a var's dynamic nature is part
of its state: it's primarily da
> The metadata tells you why:
>
> user=> (meta #'*dynamo*)
> {:ns #, :name *dynamo*, :dynamic true, :line 1, :file ...}
The var tells you why:
user=> (.isDynamic (var *dynamo*))
true
>
> Now let's make another variable with `intern`, copying the metadata from
> `*dynamo*`:
> user=> (
I'd recommend that you file a bug; surely that's a regression.
As you pointed out, this fails:
user=> (defprotocol xyz)
CompilerException java.lang.UnsupportedOperationException: Unknown
Collection type, compiling:(NO_SOURCE_PATH:1)
But the expansion works if you evaluate it directly, which might
> You can also do it the other way around, use gen-class
> and write yourself a static entry point callable from Java.
That's the right way to do it, IMO. Better yet, write a Java wrapper
to offer Javadocs and to hide any interop code. That means extra work
on both ends, but in Java shops Clojure-
There are other nine defs in core that don't have a dash version,
either. I guess if they were to take def- they'd have to add the
others and then add any new defs in pairs. But there's no reason to
write ugly code; just write your own or use a contrib, if available.
On Sep 17, 7:54 am, Rob Lally
There's this page:
http://dev.clojure.org/display/doc/Clojure+Contrib
Here's the main page for the new repos:
https://github.com/clojure
On Sep 7, 5:44 am, Jan Rychter wrote:
> How do we mere mortals (that develop and maintain large apps) migrate
> to 1.3?
>
> I thought I'd be able to at least e
> (#(true)), is this not calling a function that has no arguments and
> returns true? But it still gives same exception
Not really:
user=> (macroexpand-1 '#(true))
(fn* [] (true))
> I guess I should forgo the macro
> and go directly with (fn [] true)
For something like "=> true" try:
user=> (de
> It seems like the loop/recur is non-idiomatic for this usage and could
> be done with either a map or reduce.
It could be that it's faster that way. How does you code perform?
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False alarm. Some trouble with the VPN line.
On Aug 29, 9:06 pm, Armando Blancas wrote:
> The change to beta2 isn't working for me:
>
>
> org.clojure
> clojure
> 1.3.0-beta2
>
>
> 1.3.0-beta1 works fine.
>
> On Aug 29
The change to beta2 isn't working for me:
org.clojure
clojure
1.3.0-beta2
1.3.0-beta1 works fine.
On Aug 29, 7:28 am, Christopher Redinger wrote:
> Clojure 1.3 Beta 2 is now available at
>
> http://clojure.org/downloads
>
> The list of changes:
>
> * clojure.test/*
> I think part of the reason for
> this is the conception (maybe misconception) that most people are
> familiar with java and since there is java interopt they should be
> able to figure this out. As more and more schools are starting to use
> Python as their beginning CS language, this may well n
You can put the line break back into each line (" added stuff\n") and
then do:
(spit "output.txt" (reduce str (map change-line old-data)))
On Aug 16, 8:26 am, Thomas wrote:
> Hi everyone,
>
> I have been struggling with this, hopefully, simple problem now for
> quite sometime, What I want to do i
> I think a function should generally return the same types for
> different input. A seq and a Java array are two very different things
> even though Clojure often lets us pass both to the same functions. It
> seemed like a small fix, but I guess not everyone agrees.
That's clearly a bug; they for
> My code calls a function in 3rd party library A, which in turn calls a
> function in 3rd party library B. The lib B function uses blacklisted Java
> classes, causing my app to crash when lib A calls it. I would like to
> replace that function with a safe version, so that lib A is forced to use
You can see a concrete example of Meikel's answer right there in the
Clojure sources: files core.clj, core_deftype.clj, core_print.clj, and
core_proxy.clj define the clojure.core namespace.
On Aug 5, 4:57 am, octopusgrabbus wrote:
> Sure. module = .clj file
>
> On Aug 5, 2:35 am, Laurent PETIT w
> It's encouraging to see the community is thinking of
> ways to improve this.
We shouldn't, however, expect any significant improvements, IMO. For
the reasons explained, and the fact that lisp has almost no syntax,
this is a difficult problem to solve. Not that it has prevented people
from trying
Sounds like you're looking for (load-file "test.clj")
http://clojure.org/evaluation
On Jun 7, 12:47 pm, octopusgrabbus wrote:
> I've been searching the documentation -- which is quite good by the
> way for experienced programmers new to Clojure -- to find out how to
> load a test.clj into REPL a
> I was a bit surprised and I wonder if Clojure is
> effectively generating abstract classes rather than concrete classes?
> (Do we have no way to specify the difference? Is that only an artifact
> of the Java compiler, not the JVM bytecode?)
I don't think Clojure will generate abstract classes; t
> I doubt it. Rather, m is now an int so (dec m) can be a valid recur for h.
Yeap, that makes more sense, after all the change was on m. Maybe the
error message could read "h must receive matching primitive."
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Coercing m to int somehow prevents h from being boxed:
user=> (defn bin-search [v k c]
(loop [l 0
h (dec (count v))]
(if (> l h) false
(let [m (int (quot (+ l h) 2))
m-v (v m)]
(cond (> m-v k) (recur (inc m) h)
(> k m-v) (recur l (dec
Maybe something like this:
Java for Programmers [Paperback]
Paul J. Deitel (Author), Harvey M. Deitel (Author)
You can start with the basics of the language and then move on to
using the libraries as needed. The docs api (linked above) is a great
reference but not a place for learning how to use t
That's right. Database tables are much flatter than the typical object
composition, which you can do after you bring in a tuple into a
record. Here's probably where this limitation in Clojure hurts the
most, even when tables are fully normalized.
On May 20, 11:37 am, pmbauer wrote:
> Use Case: Au
Just in case I'll mention that Meikel's use of (with-open) will
automatically close the reader.
On May 19, 11:40 am, dokondr wrote:
> On May 19, 6:52 pm, Meikel Brandmeyer wrote:
>
> > Hi,
>
> > something like the following should work.
>
> > (with-open [rdr (java.io.FileReader. "file.txt")]
> >
Thanks for the link to the new documentation.
> That's how one hints a non-primitive return type; that's been the case for a
> long time now.
I know, but haven't needed it; I guess it's for Java interop.
> hinting arg vectors in order to indicate function return types is a
> syntactically poor
Have you seen this?
http://www.assembla.com/wiki/show/clojure/Enhanced_Primitive_Support
•hint for return goes on arg vector
◦e.g. (defn ^:static foo ^long [x] …)
◦this so it supports multi-arity with varied returns
I couldn't find a practical use of doing (defn ^String foo [] ...)
what's hinting
This renames keys to avoid collisions, using an array map to preserve
the order of the keys:
user=> (rename-keys {1 :a 2 :b 3 :c} (array-map 3 4 2 3 1 2))
{2 :a, 3 :b, 4 :c}
On May 11, 7:22 am, Armando Blancas wrote:
> > (clojure.set/rename-keys {1 :a 2 :b 3 :c} {1 2 2 3 3 4})
>
> (clojure.set/rename-keys {1 :a 2 :b 3 :c} {1 2 2 3 3 4})
>
> returns
>
> {4 :a}
That's caused by the collision between new and existing keys. Renaming
1 to 2 blows [2 :b]: {2 :a, 3 :c}; then renaming 2 to 3 blows [3 :c],
leaving {3 :a}; and the last just renames 3 to 4: {4 :a}.
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Don't be put off by these initial difficulties; this stuff is really
different. I found this paper a very good read:
http://www.cs.kent.ac.uk/people/staff/dat/miranda/whyfp90.pdf
It puts the finger on a common problem:
"Such a catalogue of “advantages” is all very well, but one must not
be surpri
Cool. I look forward to having approved 1.0.0 releases of contrib
libraries.
On May 9, 3:28 pm, Sean Corfield wrote:
> On Mon, May 9, 2011 at 2:38 PM, Armando Blancas
>
> wrote:
> > Having no clue what to make of 0.0.1 precisely w.r.t. its previous
> > versions numbers, I
Having no clue what to make of 0.0.1 precisely w.r.t. its previous
versions numbers, I gathered it's because you can't make out anybody's
modules anyway, in which I agree.
On May 9, 11:34 am, Sean Corfield wrote:
> On Mon, May 9, 2011 at 8:22 AM, Armando Blancas
>
>
Yeap. Release numbers have become meaningless; your point is well
taken.
On May 8, 7:11 pm, Sean Corfield wrote:
> The library formerly known as clojure.contrib.sql has had it's first
> non-snapshot release.
>
> Features added:
> * returns generated keys for single record inserts
> * supports nam
In 1.3 the function will (eval) to itself:
Clojure 1.3.0-alpha6
user=> (defn id [x] (list id x))
#'user/id
user=> (id 7)
(# 7)
user=> (eval (id 7))
(# 7)
user=> (= (id 7) (eval (id 7)))
true
On May 5, 6:04 am, Dominikus wrote:
> My observation is best distilled with the following definition of a
> 3. (defmacro z [] `(let [a# ~((fn [x#] (fn [] x#)) 0)]))
>
> All three calls fail, (x) and (y) and (z).
> I see no plausible reason why it *should* be that way.
As it's been pointed out, the compiler won't re-compile compiled
code.
Those macros work if you don't unquote the expressions:
(defmacr
Keys from literal maps aren't sorted; you need a sorted map.
user=> (keys {:z 1 :f 2 :a 0})
(:z :a :f)
user=> (keys (sorted-map :z 1 :f 2 :a 0))
(:a :f :z)
On May 3, 4:08 am, David Jagoe wrote:
> Hey everyone,
>
> I'm busy implementing a macro whose usage looks like this:
>
> (defentity Person
>
Thanks for the link; that helped me read the pmap code properly. So
it's not a single thread but n that get initially started, and, if the
consumer keeps up, pmap will start a thread when a result value is
taken, this staying ahead with max cpu usage. If I understand this
correctly, it's the (drop
> does access to
> lets say second part of partitioned range cause first part to be
> materialized or no?
Yes, it does.
> My second question is connected to first. If we have 4 cores and *pmap *starts
> 4 threads to perform our function on 4 parts of partitioned range, is this
> happening in para
Check this out: http://clojure.org/Transients
On Apr 29, 10:54 am, Nathan Sorenson wrote:
> (transient (subvec [1 2 3 4 5] 0 2)) fails with a class cast
> exception. Is this expected/unavoidable? How do I know whether the
> vectors I'm passed are regular vectors or come via subvec?
>
> I'm assumi
Before maven, I used the repl and jar. My root dir had src\myapp
\*.clj, ... and "classes".
1-In directory classes: "jar xf path\to\clojure.jar", same for any
other deps.
2-In root, "java -cp src;classes clojure.main"; -> "(compile
'myapp.main)"
3-Back to classes: "jar cfe myapp.jar myapp.main *.*"
With regard to mistyped keys in general, a simple option is to use
named keys; then the compiler will flag undefined ones.
(def k :key)
...
(k m)
On Apr 21, 10:44 pm, Christian Schuhegger
wrote:
> I am taking up a discussion from
> 2010:https://groups.google.com/group/clojure/browse_frm/thread/6
A type hint makes no difference because the param "state" is treated
as an Object instance.
user=> (:x @*aa*)
3
user=> (.invoke :x @*aa*) ; [16] invoke : Object (Object)
3
Besides, I don't think it's a good idea trying to setup some sort of
static type-checker and strongly-typed functions. You're
You may want to follow this thread and look for the latest version of
Clojure in Small Pieces:
http://groups.google.com/group/clojure/browse_thread/thread/460417fe45f314c3/db1e7b58031efc7e
On Apr 17, 12:27 pm, Terje Dahl wrote:
> I would very much like to study and understand how Clojure works
>
> New development is happening in new, per-library
> repositories athttp://github.com/clojure
BTW, last night I noticed that this file hasn't been updated for 1.3:
https://github.com/clojure/clojure-contrib/blob/master/modules/repl-utils/src/main/clojure/clojure/contrib/repl_utils/javadoc.clj
bu
I'm using:
org.clojure.contrib
repl-utils
1.3.0-SNAPSHOT
...
clojure-snapshots
http://build.clojure.org/snapshots
...
My user.clj has: (use '[clojure.contrib.repl-utils :only (show run
run*)])
And I launch the repl with:
java -cp "C:\Documents and
Could "before next release" be changed to something like, er, "real
soon"? (at least for c.c namespaces)
Var *feeling-lucky-url* not marked :dynamic true, setting to :dynamic.
You should fix this before next release!
Var *feeling-lucky* not marked :dynamic true, setting to :dynamic. You
should fix
Interesting. Thanks for your response.
On Apr 14, 10:06 am, Ken Wesson wrote:
> On Thu, Apr 14, 2011 at 12:26 PM, Armando Blancas
>
> wrote:
> > I wonder in which cases this code is a good choice: a function that
> > returns uneval'ed code. Something about macros not b
I copy that. FWIW, I'm not in the eval-is-evil camp, so didn't have an
opinion one way or the other. I've seen code like that in posted
samples and wanted to know if that's a technique useful to have
around.
On Apr 14, 9:34 am, David McNeil wrote:
> > Will this be any
> > better or worse: (defn m
I wonder in which cases this code is a good choice: a function that
returns uneval'ed code. Something about macros not being an option
where a function is expected, or a kind of lazy eval? Will this be any
better or worse: (defn m [f s] (fn [] (map f s))) then doing (foo)
instead of (eval foo)?
On
You're right, I didn't consider that those methods are public. I don't
think you're making any mistakes; that's just not supported. In you
case I'd probably write a Java class with all the requirements and
internally consume Clojure functions done with a simpler usage of gen-
class or deftype. I cu
> what makes you think posting to a general-interest list will have the effect
> you desire?
(LOL) Indeed. And to prove it, here's the de rigueur retort of
opensourceland: you fix it.
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Write a Java interface with these two methods and have your gen'ed
class implement it. The gen'ed methods won't have a throws clause but
will work with the serialization mechanism all the same.
On Apr 11, 12:50 pm, Jules wrote:
> I'd like to provide :
>
> private void writeObject(java.io.ObjectO
That's because of the order of the definitions of foobar and let.
Thus:
guik.evil=> (macroexpand '(foobar 10))
(let* [a__44__auto__ 10] (clojure.core/+ a__44__auto__ a__44__auto__))
But defining let before foobar:
guik.evil=> (macroexpand-1 '(let))
(guik.evil/let*)
guik.evil=> (macroexpand-1 (ma
> My modest proposal: [snip]
Have you considered a grant from the National Science Foundation?
Dennis Ritchie is still around in what remains of Bell Labs; maybe he
could help us read from standard input.
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> Can anybody suggest anything
> that will enable me to write this simple program that any middle-
> school student would find, well, basic if written in BASIC? Thanks.
Write your own read function to delegate to (read-line) or, in debug
mode, read the next line from some file; then keep various f
There's nothing wrong there. Would need to see the java snippet how is
called.
On Apr 6, 11:03 pm, MohanR wrote:
> This is a beginner's question but I thought I might be missing
> something.
>
> I am setting a System property and testing for it like this. It
> passes.
>
> ( deftest testlogger
>
You may want to contact the library's developer to request it be
published as a component, or do it yourself since it's open source and
they won't mind the added exposure. Once that lib is up in clojars you
continue as normal.
On Apr 7, 6:49 am, j1n3l0 wrote:
> Hi,
>
> I've written a little cloju
> Should I file a bug about this ?
File it. Access to package-private fields is a legitimate
implementation decision. It's self-defeating for Clojure to put up
obstacles when its adoption will most likely grow mixed with Java, and
for maintenance. It makes no difference if you can use reflection o
> I could write a number of abstracts representing different approaches to
> presenting the same core material, but that would seem disingenuous...
Since you've got the credentials of "an otherwise great speaker",
should your topic be taken they might have you talk about Ruby. Or,
that call for t
use invoke.
On Apr 3, 11:18 am, monyag wrote:
> Hello, Armando! do you can give me short example? I have some
> RuntimeExaptions :(
>
> On 3 апр, 01:31, Armando Blancas wrote:
>
> > You need to use a few more classes from jvm/clojure/lang. For example,
> > with Persi
You need to use a few more classes from jvm/clojure/lang. For example,
with PersistentVector#create(Object...) and one of the
Keyword#intern() calls you should be able to construct myParams.
On Apr 2, 4:32 am, monyag wrote:
> Hi! I use clojure from java. And I don't know how to send params to
> c
You'd have to not back-quote Region and then eval the reseult:
user=> (def Country {'fields '((int x) (double y {reference
Region}))})
#'user/Country
user=> ((nth (nth (Country 'fields) 1) 2) 'reference)
Region
user=> (eval ((nth (nth (Country 'fields) 1) 2) 'reference) )
{fields ((datatype x) (da
> I particularly like the bleeding-edge attention Amazon gives to their AWS
>plugin[1] and the GUI builders that Google open-sourced sometime last year[2].
Well, those gui builders are now free of charge, so there's something
to like right there. If that were the way products get built, or even
p
That's how it is with these bloated IDEs. My day job is mainly Eclipse
plug-in/rcp dev, so I'm also guilty of putting an absurd burden on
others (disk footprint, startup time, memory use, unresponsiveness),
but that's what's passes for effective tooling these days.
On Apr 1, 4:10 am, Chas Emerick
> So, really, all the current ccw behaviour wrt auto-compile, in background or
> not, concept of "Clojure Application" will be reworked.
One thing that ccw handles with ease is compiling Java for use right
there in Clojure. With auto-compile one could do the opposite just as
easy for dependent pro
> Your problem is probably that you only export the clj file. But the clj file
> corresponds to a namespace with a gen-class. A gen-class must be compiled.
> And yours is probably not.
I'd think that's what the ccw.builder is there for. Then it'd be up to
the user to decide what to export. Having
> IntelliJ w/ La Clojure -
> Could get a REPL, couldn't figure out how to do anything else. In
> particular, I followed some specific instructions from somewhere
> (can't remember where) for how to set up a project, edit a source file
> (hello world or whatever), and "run" that source file. All I
For interop I write interfaces in Java. This way I can provide type-
specific signatures, constants, javadocs and generics; then implement
them all in Clojure. I also write exception classes in Java for use in
Clojure since I find it simpler and cleaner than gen-class. You don't
have to give up any
> I have been offered money
> to program in java in the past. I turned it down, turning the phrase
> "you couldn't pay me to program in java" into a reality. It's fair to
> state that I hate java more than any other language. I'd rather
> program in COBOL than java.
That's quite alright. Nine o
Here's a version with a similar simulated exception but caught in the
main loop, with a bit of tracing code to show the retries.
Clojure 1.2.0
user=> (import java.io.IOException)
java.io.IOException
user=>
user=> (defn some-io-operation []
(let [n (rand-int 30)]
(if (> n 10)
(throw (I
> However, the visited field has nothing to do with the actual Node
> class. It's simply for other functions to use as a marker.
>
> This solution is kludgy, but I cannot see any other *performant* way
> of doing this.
I don't think markers are a kludge. Besides modeling, data structures
must supp
> Yes, I know. It disproved the suggestion that it was expanding macros
> there *before* checking for special symbols. That was precisely my
> point with that demonstration.
I must have misread your comments.
> When the macro expands into a special form, or a form involving a
> special subform, t
Another choice is to construct shapes as closures with auto-dispatch.
So a circle could be made thus, with no data structure per se:
(defn make-circle [x y r]
(fn [method]
(case method
:draw (fn [color] ...)
:rotate (fn [degrees] ...)
:r (fn [] r)
:x (fn [] x)
:
> If so, it's only the subforms not in operator position that get
> macroexpanded first. Otherwise
>
> user=> (defmacro qqq [] 'if)
> #'user/qqq
> user=> ((qqq) (even? 42) "boo!")
> # in this context (NO_SOURCE_FILE:607)>
>
> would instead produce "boo!", as (qqq) would be expanded to if and
> then
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