[jira] [Commented] (GROOVY-7428) Change precedence priority of ** compared to pre/post inc/dec and unary plus/minus

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-7428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14549340#comment-14549340 ] 

ASF GitHub Bot commented on GROOVY-7428:
----------------------------------------

GitHub user paulk-asert opened a pull request:

    https://github.com/apache/incubator-groovy/pull/18

    GROOVY-7428: Change precedence priority of ** compared to pre/post in…

    …c/dec and unary plus/minus

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/paulk-asert/incubator-groovy groovy7428

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-groovy/pull/18.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #18
    
----
commit a0afb0e814bdaec656fa48e53d417b0bb7051348
Author: Paul King <pa...@asert.com.au>
Date:   2015-05-18T22:04:34Z

    GROOVY-7428: Change precedence priority of ** compared to pre/post inc/dec and unary plus/minus

----


> Change precedence priority of ** compared to pre/post inc/dec and unary plus/minus
> ----------------------------------------------------------------------------------
>
>                 Key: GROOVY-7428
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7428
>             Project: Groovy
>          Issue Type: Improvement
>            Reporter: Paul King
>              Labels: breaking
>
> Currently the precedence order is:
> {noformat}
> level 1: post inc/dec
> level 2: power
> level 3: pre inc/dec
> {noformat}
> The original intention, I believe, was always:
> {noformat}
> level 1: post inc/dec
> level 2: pre inc/dec
> level 3: power
> {noformat}
> This leads to some unintuitive behavior:
> while these are the same:
> {code}
> println (-9 + 2)  //  -7
> println ((-9) + 2)  //  -7
> {code}
> these are different:
> {code}
> println (-9 ** 2)  //  -81  actually: println (-(9 ** 2))
> println ((-9) ** 2)  //  81
> {code}
> Similar anomalies occur between {{**}} and {{++}}/{{--}}



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