that one doesn't actually work, maybe, not sure why exactly but the assert
is ignored
=> (def component? number?)
#'runtime.q/component?
=> (defmacro defcomponent [name co]
`(assert (component? ~co) "Not a valid IComponent")
`(def ~name ~co))
#'runtime.q/defcomponent
=> (defcomponent a "a")
#'runtime.q/a
The `(do ...) one works though,
=> (defmacro a []
`(println 1)
`(println 2)
)
#'runtime.q/a
=> (a)
2
nil
=> (defmacro a []
`(do
(println 1)
(println 2)
)
)
#'runtime.q/a
=> (a)
1
2
nil
On Thu, Feb 21, 2013 at 3:14 PM, Jim foo.bar <jimpil1...@gmail.com> wrote:
> I tried this and it works, but I need 2 backticks and I'm essentially
> generating the assert-form when the macro is called...I'd like to generate
> only the def-form at run-time...
>
> (defmacro defcomponent [name co]
> `(assert (component? ~co) "Not a valid IComponent")
> `(def ~name ~co))
>
> it looks ugly doesn't it?
>
> Jim
>
>
>
>
> On 21/02/13 14:11, AtKaaZ wrote:
>
> or you could place the assert inside the backquote
>
>
> On Thu, Feb 21, 2013 at 3:10 PM, Jim foo.bar <jimpil1...@gmail.com> wrote:
>
>> On 21/02/13 14:07, Jim foo.bar wrote:
>>
>>> Hi all,
>>>
>>> I''d like to have a macro like the following but preferably without the
>>> 'eval' inside the assertion form:
>>>
>>> (defmacro defcomponent [name co]
>>> (assert (component? (eval co)) "Not a valid IComponent")
>>> `(def ~name ~co))
>>>
>>> If I don't use eval, everything works as long as I pass a var
>>> in...However if I pass in something like (String. "jam") it is not being
>>> evaluated and thus is a list not an object...and it will never satisfy
>>> IComponent.
>>>
>>> any thoughts?
>>> thanks in advance :)
>>>
>>> Jim
>>>
>>>
>>>
>> I could have phrased this better...One of my arguments has to NOT be
>> evaluated (name) but the other needs to be evaluated (co) so I can assert
>> whatever I want to assert on it...I cannot use 'defn' (it will cause 'name'
>> to be evaluated) so my only option is a macro that forces eval on the
>> second arg, yes?
>>
>>
>> Jim
>>
>> --
>> --
>> 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 unsubscribe from this group and stop receiving emails from it, send an
>> email to clojure+unsubscr...@googlegroups.com.
>> For more options, visit https://groups.google.com/groups/opt_out.
>>
>>
>>
>
>
> --
> Please correct me if I'm wrong or incomplete,
> even if you think I'll subconsciously hate it.
>
> --
> --
> 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 unsubscribe from this group and stop receiving emails from it, send an
> email to clojure+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/groups/opt_out.
>
>
>
>
> --
> --
> 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 unsubscribe from this group and stop receiving emails from it, send an
> email to clojure+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/groups/opt_out.
>
>
>
--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
--
--
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 unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
