Thank you! I didn't know you could do .newInstance
oh that's a nice trick with eval and list 'new
So it's not impossible after all, thanks Aaron!
Here's what I got from what you said:
=> *(defmacro mew [cls & restt]
`(eval (list 'new ~cls ~@restt))
)*
#'runtime.q/mew
=> *(let [a java.lang.RuntimeException]
(mew a)
)*
#<RuntimeException java.lang.RuntimeException>
it makes sense now, using eval at runtime not at compile time as I was
trying
and also the newInstance variant:
=> *(defmacro mew [cls & restt]
`(.newInstance ~cls ~@restt)
)*
#'runtime.q/mew
=> *(let [a java.lang.RuntimeException]
(mew a)
)*
#<RuntimeException java.lang.RuntimeException>
Really, thank you Aaron,
On Thu, Feb 14, 2013 at 11:02 PM, Aaron Cohen <[email protected]> wrote:
> Yes, since this is runtime you should use reflection.
>
> (let [a java.lang.RuntimeException]
> (.newInstance a))
>
> Alternatively, you can use eval:
>
> (let [a java.lang.RuntimeException]
> (eval (list 'new a)))
>
>
> On Thu, Feb 14, 2013 at 4:53 PM, AtKaaZ <[email protected]> wrote:
>
>> I figure since new is expecting a class at compiletime, we can never pass
>> it a class that we evaluate at runtime(those locals), ergo => impossible to
>> macro around "new" like that
>>
>> like this => impossible:
>> *(let [a java.lang.RuntimeException]
>> (macro-that-eventually-calls-new a))*
>>
>> maybe someone could suggest another way? clojure.reflect ?
>>
>>
>>
>> On Thu, Feb 14, 2013 at 10:40 PM, AtKaaZ <[email protected]> wrote:
>>
>>> thanks for the reply,
>>>
>>> => *(defmacro mew [cls & args]
>>> `(new ~cls ~@args))*
>>> #'runtime.q/mew
>>> =>* (let [a java.lang.RuntimeException]
>>> (mew a)
>>> )*
>>>
>>> CompilerException java.lang.IllegalArgumentException: Unable to resolve
>>> classname: a, compiling:(NO_SOURCE_PATH:2:3)
>>>
>>> that would be the equivalent macro of what *new* is doing
>>> it's like
>>> *(new a)*
>>> CompilerException java.lang.IllegalArgumentException: Unable to resolve
>>> classname: a, compiling:(NO_SOURCE_PATH:2:3)
>>>
>>>
>>> This is the goal:
>>>
>>> The goal is to can write this form:
>>> => *(let [a java.lang.RuntimeException]
>>> (new a))*
>>>
>>> but I think it's impossible, at least by using "new" it is
>>>
>>>
>>> On Thu, Feb 14, 2013 at 10:34 PM, Andy Fingerhut <
>>> [email protected]> wrote:
>>>
>>>>
>>>> On Feb 14, 2013, at 1:27 PM, AtKaaZ wrote:
>>>>
>>>> The goal is to can write this form:
>>>> => *(let [a java.lang.RuntimeException]
>>>> (new a)
>>>> )*
>>>> CompilerException java.lang.IllegalArgumentException: Unable to resolve
>>>> classname: a, compiling:(NO_SOURCE_PATH:2:3)
>>>>
>>>> attempt with macro:
>>>> =>* (defmacro mew [cls & restt]
>>>> `(new ~(eval cls) ~@restt)
>>>> )*
>>>> #'runtime.q/mew
>>>>
>>>>
>>>> This is probably your closest attempt. Try this variation on the above:
>>>>
>>>> (defmacro mew [cls & args]
>>>> `(new ~cls ~@args))
>>>>
>>>> user=> (macroexpand-1 '(mew java.lang.RuntimeException))
>>>> (new java.lang.RuntimeException)
>>>>
>>>> Andy
>>>>
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>>>
>>>
>>>
>>> --
>>> Please correct me if I'm wrong or incomplete,
>>> even if you think I'll subconsciously hate it.
>>>
>>>
>>
>>
>> --
>> Please correct me if I'm wrong or incomplete,
>> even if you think I'll subconsciously hate it.
>>
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>
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--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
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