Re: bit-wise operators for bigint in Clojure

[Niels van Klaveren]

Clojure often leaves implementations to the backing platforms, and 
Clojurescript probably has no difference in the methods of the different 
numerical types.
Java does, so you'd have to fall back on that. Something like:

(defn big-or
  [f & r]
  (reduce (fn [acc v] (.or acc (biginteger v))) (biginteger f) r))

(defn big-and
  [f & r]
  (reduce (fn [acc v] (.and acc (biginteger v))) (biginteger f) r))

(defn big-xor
  [f & r]
  (reduce (fn [acc v] (.xor acc (biginteger v))) (biginteger f) r))

A lot of (mathemathical) operations need falling back to the platform, and 
this is by design for clojure. There are however libraries that are 
intended to abstract away the differences, and one of those for math is 
clojure.math.numeric-tower.

A numeric type independent implementation for bitwise operations would be a 
fitting pull request there.


On Tuesday, May 26, 2020 at 6:39:51 PM UTC+2, Harmon Nine wrote:
>
> Hello.
>
> I noticed a post about this from 2013, so doing a bump.
>
> The bit-wise operators appear to be supported for 'bigint' in 
> ClojureScript, but not in Clojure.  Is support for these operations on 
> 'bigint' in Clojure a future enhancement?
>
> Thanks :)
> -- Harmon
>

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Re: bit-wise operators for bigint in Clojure

[Niels van Klaveren]

Clojure 1.10:

(and 4N 8N (bigint Integer/MAX_VALUE))
=> 2147483647N

(or 4N 8N (bigint Integer/MAX_VALUE))
=> 4N


On Tuesday, May 26, 2020 at 6:39:51 PM UTC+2, Harmon Nine wrote:
>
> Hello.
>
> I noticed a post about this from 2013, so doing a bump.
>
> The bit-wise operators appear to be supported for 'bigint' in 
> ClojureScript, but not in Clojure.  Is support for these operations on 
> 'bigint' in Clojure a future enhancement?
>
> Thanks :)
> -- Harmon
>

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Re: bit-wise operators for bigint in Clojure

[Alan Thompson]

In Clojure, it is probably easiest to just use Java interop, eg:
https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/math/BigInteger.html#setBit(int)
Alan


On Tue, May 26, 2020 at 9:39 AM Harmon Nine  wrote:

> Hello.
>
> I noticed a post about this from 2013, so doing a bump.
>
> The bit-wise operators appear to be supported for 'bigint' in
> ClojureScript, but not in Clojure.  Is support for these operations on
> 'bigint' in Clojure a future enhancement?
>
> Thanks :)
> -- Harmon
>
> --
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> 
> .
>

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bit-wise operators for bigint in Clojure

[Harmon Nine]

Hello.

I noticed a post about this from 2013, so doing a bump.

The bit-wise operators appear to be supported for 'bigint' in 
ClojureScript, but not in Clojure.  Is support for these operations on 
'bigint' in Clojure a future enhancement?

Thanks :)
-- Harmon

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