Re: A problem about position of function used by binding

[guid]

 @Matching Socks, thank you very much.

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Re: A problem about position of function used by binding

[Matching Socks]

There is a manual! https://clojure.org/reference/documentation - see 
especially under Vars and Compilation.

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Re: A problem about position of function used by binding

[guid]

James, thank you very much 

Yes, I can fix it by using ^:dynamic or using #'test1 in test4, but I want 
to know what happened when I call test4.

>so it'll optimise out the var for performance.
if you mean it will not check bounding list when I call test1 within test4

Does any document or book can help me to understand it ?

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Re: A problem about position of function used by binding

[James Reeves]

When you define test4 in your first example, the compiler doesn't know that
test1 is dynamic, so it'll optimise out the var for performance.

To fix it, ensure that the var is declared as dynamic:

  (declare ^:dynamic test1)

- James

On 7 February 2017 at 03:26, guid  wrote:

> hello everyone
>
> I have a problem about binding function in clojure1.8.
> when I changed position of function which call a bound function I got
> different result.
>
> If I define test4 (call test1 within it) before test1, binding would not
> work
>
> (declare test1)
>
> (defn test2 [](prn "test2"))
>
>
> (defn test4 [] (test1))
>
>
> (defn ^:dynamic test1 [] (prn "dynamic test1"))
>
>
> (defn testB []
>   (binding [test1 test2]
> (test1)
> (test4)
> ))
>
>
> when I call (testB) result is
>
> "test2"
> "dynamic test1"
>
>
> But if I change postion of (defn test4 xxx) and (defn ^:dynamic test1 ), 
> binding will work well.
>
>
> (declare test1)
>
> (defn test2 [](prn "test2"))
>
>
> (defn ^:dynamic test1 [] (prn "dynamic test1"))
>
>
> (defn test4 [] (test1))
>
>
> (defn testB []
>
>   (binding [test1 test2]
> (test1)
> (test4)
> ))
>
>
> result is
>
> "test2"
> "test2"
>
>
> Any way, with-bindings is the same as binding, but why ?
>
>
> 
>
> any help would be appreciated
>
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