I think the reason why we could redirect the *out* or *err* is that, all
Clojure functions staffs USE these 2 writers. But in places where it
doesn't (such as places where it uses System/out, System/err directly), it
would cause problem.
Here is a proof:
(with-out-str
(with-open [out-writer (clojure.java.io/writer System/out)]
(.write out-writer "hello")))
This statement returns empty string: ""
Which means the output is never captured because it does not use the *out*
writer.
2013/3/5 Jim - FooBar(); <jimpil1...@gmail.com>
> I can see why you would think that but it would be the same story for
> *out* wouldn't it. Noone redirects System.out when you bind *out* to some
> writer, however still it works...
> I don't exactly have time to look into this now but I may do this
> afternoon :)
>
> Jim
>
>
> On 05/03/13 15:07, bruce li wrote:
>
> Thanks. Then I think I've caught some idea.
>
> When binding *err* with other writer (say a StringWriter s), anything that
> use the *err* writer will actually write to s. But the original stderr
> stream is not redirected. It is still preserved as System/err. Thus
> anything that does not use the *err* writer, but instead use the System/err
> stream will not get affected.
>
> Hope this makes sense.
>
> 2013/3/5 Jim - FooBar(); <jimpil1...@gmail.com>
>
>> On 05/03/13 14:50, bruce li wrote:
>>
>> What is the difference between *err* and System/err?!
>>
>> its the same but wrapped in a PrintWriter
>>
>>
>> http://richhickey.github.com/clojure/clojure.core-api.html#clojure.core/*err*
>>
>> Jim
>>
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