[#CLJ-952] bigdec does not properly convert a clojure.lang.BigInt - Clojure JIRA

Details

Type: Defect
Status: Closed
Priority: Major
Resolution: Completed
Affects Version/s: Release 1.3, Release 1.4
Fix Version/s: Release 1.5
Component/s: None
Labels:
None

Patch:
Code and Test
Approval:
Ok

Description

bigdec handles java.math.BigInteger when converting to java.math.BigDecimal, but it does not handle clojure.lang.BigInt. Instead it treats a clojure.lang.BigInt as a Number, by casting it to long. This causes the following error:

Clojure 1.4.0-beta3
user=> (bigdec (inc (bigint Long/MAX_VALUE)))
IllegalArgumentException Value out of range for long: 9223372036854775808 clojure.lang.RT.longCast (RT.java:1123)

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Attachments

clj-952-make-bigdec-work-on-bigints-patch1.txt

21/Mar/12 10:55 AM

2 kB

Andy Fingerhut

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Andy Fingerhut added a comment - 21/Mar/12 10:55 AM

Add a case to bigdec to handle BigInts. Also eliminate a reflection warning in the ratio case while we are in there. Paul's failing case has been added to tests, fails before the fix, and passes after. Attempted to make it as run-time efficient as possible by creating a new BigInt/toBigDecimal, patterned after the existing BigInt/toBigInteger.

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Andy Fingerhut added a comment - 21/Mar/12 10:55 AM Add a case to bigdec to handle BigInts. Also eliminate a reflection warning in the ratio case while we are in there. Paul's failing case has been added to tests, fails before the fix, and passes after. Attempted to make it as run-time efficient as possible by creating a new BigInt/toBigDecimal, patterned after the existing BigInt/toBigInteger.

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Paul Stadig added a comment - 21/Mar/12 11:51 AM - edited

I was originally thinking of something like (BigDecimal. (.toBigInteger ^clojure.lang.BigInt x)). Adding a toBigDecimal method to clojure.lang.BigInt saves some object allocations and such. Probably more of a micro optimization, but it works.

Clojure 1.4.0-master-SNAPSHOT
user=> (bigdec (inc (bigint Long/MAX_VALUE)))
9223372036854775808M

Thanks, Andy!

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Paul Stadig added a comment - 21/Mar/12 11:51 AM - edited I was originally thinking of something like (BigDecimal. (.toBigInteger ^clojure.lang.BigInt x)). Adding a toBigDecimal method to clojure.lang.BigInt saves some object allocations and such. Probably more of a micro optimization, but it works.

Clojure 1.4.0-master-SNAPSHOT user=> (bigdec (inc (bigint Long/MAX_VALUE))) 9223372036854775808M Thanks, Andy! +1

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Alan Dipert added a comment - 20/Apr/12 1:35 PM

Looks good to me, thanks.

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Alan Dipert added a comment - 20/Apr/12 1:35 PM Looks good to me, thanks.

People

Assignee:

Unassigned

Reporter:

Paul Stadig

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Dates

Created:

12/Mar/12 2:21 PM

Updated:

18/May/12 12:32 PM

Resolved:

18/May/12 12:32 PM