(Point. x y) is resolved as if "Point." was a special form. Nothing Lisp-2
about it. :)


On Thu, Oct 31, 2013 at 11:48 AM, Mars0i <marsh...@logical.net> wrote:

> OK, I get it now.  By using Point. I'm ... temporarily descending into the
> Java world, on top of which Clojure is built.
>
> By using ->Point I remain in the more harmonious Clojure world, which
> usually hides the darkness of Java from me.
>
> (No offense meant to Java afficionados.  One of the things I love about
> Clojure is its Java interop.)
>
> On Thursday, October 31, 2013 10:38:31 AM UTC-5, Mauricio Aldazosa wrote:
>
>> On Thu, Oct 31, 2013 at 9:15 AM, Mars0i <mars...@logical.net> wrote:
>>
>>> Excellent.  Thanks Tassilo.  I had attempted to do the same sort of
>>> thing using
>>>     Point.
>>> rather than
>>>     ->Point
>>> which didn't work:
>>>     user => (doc Point.)
>>>     nil
>>>     user=> Point.
>>>     CompilerException java.lang.ClassNotFoundException: Point.,
>>> compiling:(NO_SOURCE_PATH:0:0)
>>>     user=> ->Point
>>>     #<user$eval254$__GT_Point__269 user$eval254$__GT_Point__269@
>>> 3c90fa05>
>>>
>>> I had assumed that Point. and ->Point were the same thing, but they are
>>> apparently not.  ->Point names something real, while Point. is just some
>>> kind of magic, I guess.
>>>
>>
>> The thing to remember here is that by defining a record you are creating
>> a new Java class. As a convenience a factory function (Point->) is created
>> for you, but you can always create instances of your record via the
>> constructor (Point.). Point. is a macro that expands to (new Point).
>>
>> Take a look at http://clojure.org/datatypes for an introduction of what
>> is going on when you use defrecord and http://clojure.org/java_
>> interop#Java%20Interop-The%20Dot%20special%20form-(new%
>> 20Classname%20args*) for the constructor documentation.
>>
>> Mauricio
>>
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