Hi Michael,
See my response to Rich for a more complete example of what I am
trying to do.
The unquoted let doesn't seem to work for me, e.g.
(defmacro doit [thing]
(let [evaled-thing thing]
evaled-thing))
(macroexpand '(doit "foo"))
-> "foo"
(macroexpand-1 '(doit (.toUpperCase "foo")))
-> (.toUpperCase "foo")
Even with the let, I sill don't get "FOO"...
Stuart
> Hi,
>
>> On Nov 7, 3:48 pm, Stuart Halloway <[EMAIL PROTECTED]> wrote:
>>> The following macro in lancet defines an ant task.
>>>
>>> (defmacro define-ant-task [task-name]
>>> `(def ~(symbol task-name) (create-ant-task ~task-name)))
>>>
>>> (At least) one of the following assumptions is wrong:
>>>
>>> (1) define-ant-task needs to be a macro so it can drop args into
>>> def.
>>>
>>> (2) define-ant-task needs to be a function because task-name needs
>>> to
>>> be evaled on the way in.
>>>
>>> (3) using eval (which would solve the contradiction in 1 & 2) is
>>> evil
>>> and should be avoided.
>>>
>
> As Rich pointed out, its unclear what you are trying to do, so I'm
> making assumptions here, but this strikes me as similar to something I
> encountered. I believe I got what I needed by wrapping an unquoted let
> around the syntax-quote in order to force evaluation:
>
> (defmacro definte-ant-task [task-name]
> (let [evaled-task-name task-name] ;; Force evaluation of task-name
> `(def ~(symbol evaled-task-name) (create-ant-task ~evaled-task-
> name))))
>
> Using (eval) will work, but I agree, it feels wrong to use eval which
> is why I sought after this solution here.
>
> /mike.
>
> >
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