[parenscript-devel] help: question about eval-when usage

[Canhua]

great explanation! thank you so much!

On Sat, Jan 21, 2012 at 6:03 AM, Vladimir Sedach <vsedach at gmail.com> wrote:
> Hi,
>
> It is indeed an omission in the reference manual - EVAL-WHEN is a
> supported Parenscript form. I will add it to the manual soon.
> EVAL-WHEN in Parenscript has the following meaning:
>
> The code in BODY is assumed to be Common Lisp code
> in :compile-toplevel and :load-toplevel sitations, and Parenscript
> code in :execute
>
> So for example, this is how the Parenscript macro IN-PACKAGE is defined:
>
> (defpsmacro in-package (package-designator)
>  `(eval-when (:compile-toplevel)
>     (in-package ,package-designator)))
>
> It just executes CL code - handy when you're writing .paren files that
> only have Parenscript code.
>
> Vladimir
>
> On Thu, Jan 19, 2012 at 10:44 PM, Canhua <dreameration at gmail.com> wrote:
>> I am reading codes of paren-util. I find that it use "eval-when"
>> inside defpsmacro.
>> But I don't find that parenscript reference says eva-when is supported.
>> As I understand, defpsmacro should expand into a valid parenscript code. Does
>> parenscript support eval-when that although doesn't appear in reference.
>>
>> Thanks.
>>
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>
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