Just to be clear, it is namespace resolved because of syntax quote:
(defmacro deftest
[name & body]
(when *load-tests*
`(def ~(vary-meta name assoc :test `(fn [] ~@body))
(fn [] (test-var (var ~name))))))
On Mon, Aug 15, 2011 at 7:23 PM, Alan Malloy <a...@malloys.org> wrote:
> Is it? That's neat; I guess I've never thought about how the compiler
> treats def. Thanks for the explanation.
>
> On Aug 15, 3:03 pm, Mark Rathwell <mark.rathw...@gmail.com> wrote:
>> deftest is a macro. Macros are expanded at compile time. So, in this
>> case, at compile time, a function called namespace2 is def'd with meta
>> data :test set to the body of your deftest.
>>
>> All of that body is namespace resolved in macro expansion, before
>> in-ns is ever executed (which happens when you actually call the
>> namespace2 function created by the macro). Put another way, (def
>> anything 10) is namespace resolved to (def
>> learn.clojure.test.core/anything 10) at macro expansion time (compile
>> time), before the test function is ever called, and thereby before
>> in-ns is ever executed.
>>
>> Hope this helps.
>> On Mon, Aug 15, 2011 at 5:07 PM, Richard Rattigan <ratti...@gmail.com>
>> wrote:
>>
>> > I'm finding that namespaces don't seem to behave as I expect
>> > intuitively, or according to the reference. It's quite possible I'm in
>> > the wrong here though, as I'm just kicking clojure's tires at this
>> > point.
>>
>> > Here is the relevant doc:
>>
>> >http://clojure.org/special_forms
>> > (def symbol init?)
>> > Creates and interns or locates a global var with the name of symbol
>> > and a namespace of the value of the current namespace (*ns*).
>>
>> > In the test below, which succeeds, the var does not appear to end up
>> > in the "current namespace" per this definition. Am I misinterpreting
>> > something, or is this a deviation from the spec/reference?
>>
>> > (ns learn.clojure.test.core
>> > (:use [clojure.test]))
>> > (deftest namespace2
>> > (in-ns 'my.new.namespace)
>> > ;confirm the current namespace
>> > (is (= "my.new.namespace" (str *ns*)))
>> > ;attempt to def a var in the current namespace
>> > (def anything 10)
>> > ;the var is not defined in the current namespace
>> > (is (nil? (ns-resolve *ns* 'anything)))
>> > ;the var is however definined in the orginal namespace
>> > (is (not (nil? (ns-resolve (find-ns 'learn.clojure.test.core)
>> > 'anything))))
>> > (is (= 10 learn.clojure.test.core/anything)))
>
> --
> You received this message because you are subscribed to the Google
> Groups "Clojure" group.
> To post to this group, send email to clojure@googlegroups.com
> Note that posts from new members are moderated - please be patient with your
> first post.
> To unsubscribe from this group, send email to
> clojure+unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/clojure?hl=en
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
