On Monday 22 December 2008 05:55, Mark Volkmann wrote:
> On Sun, Dec 21, 2008 at 3:44 PM, Stephen C. Gilardi wrote:
> > ...
>
> I thought that every symbol and keyword was in some namespace,
> defaulting to the current namespace when the symbol or keyword is
> defined. Since the default namespace in the REPL is user, that's what
> I expected. I get the same error though with any symbol that I def.
> For example,
>
> (def n 1)
> (namespace n)
> java.lang.IncompatibleClassChangeError (NO_SOURCE_FILE:0)
>
> Shouldn't the namespace of n be user?
Starting with this:
user=> (doc namespace)
-------------------------
clojure.core/namespace
([x])
Returns the namespace String of a symbol or keyword, or nil if not
present.
Note that namespace is a function, not a macro or special form. That
means its arguments are _always_ evaluated before it is invoked. So in
the example you gave is the same as:
user=> (namespace 1)
java.lang.IncompatibleClassChangeError (repl-1:5)
Presumably (as I mentioned earlier) you want to examine the Var
associated with the name "n" (as you def'ed in your example):
user=> ^#'n
{:ns #<Namespace user>, :name n, :file "repl-1", :line 6}
user=> (str (:ns ^#'n))
"user"
You could create a macro to do this:
(defmacro var-namespace-name [v] `(str (:ns ^(var ~v))))
user=> (var-namespace-name n)
"user"
Randall Schulz
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