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https://issues.apache.org/jira/browse/GROOVY-7772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15185802#comment-15185802
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ASF GitHub Bot commented on GROOVY-7772:
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GitHub user uehaj opened a pull request:
https://github.com/apache/groovy/pull/287
Javalike method pointer groovy 7772
This is a change for method pointer semantics in groovy discussed in
following issue.
https://issues.apache.org/jira/browse/GROOVY-7772
ref.
http://docs.groovy-lang.org/latest/html/documentation/index.html#method-pointer-operator
https://docs.oracle.com/javase/tutorial/java/javaOO/methodreferences.html#type
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/uehaj/groovy
javalike-method-pointer-GROOVY-7772
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/groovy/pull/287.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 #287
----
commit 0308f6fe44ba354ba3eaf61d45f924895d09483d
Author: UEHARA Junji <[email protected]>
Date: 2016-03-07T21:18:54Z
GROOVY-7772: Change method pointer like Java 8
commit f2ab90ea1ee0960d2a87b0feb536c4134841eb82
Author: UEHARA Junji <[email protected]>
Date: 2016-03-08T20:00:44Z
GROOVY-7772: Add test cases.
commit 280a27b6b4715d153e01258670dda5131ebed187
Author: UEHARA Junji <[email protected]>
Date: 2016-03-08T20:28:32Z
GROOVY-7772: Handle too few arguments as missing method exception.
----
> Class.&instanceMethod had better to have same meaning of
> Class::instanceMethod of Java8
> ---------------------------------------------------------------------------------------
>
> Key: GROOVY-7772
> URL: https://issues.apache.org/jira/browse/GROOVY-7772
> Project: Groovy
> Issue Type: Improvement
> Components: groovy-runtime
> Affects Versions: 2.4.6
> Reporter: UEHARA Junji
> Assignee: Jochen Theodorou
> Priority: Minor
>
> Groovy's operator .& for method is similar functionality to Java8's method
> reference operator ::.
> ||No.||lhs||rhs||meaing of Groovy's .& (Closure) ||meaning of java8's ::
> (FunctionalInterface)||
> |1|instance|instanceMethod| { ..args -> instance.instanceMethod(args) | same
> as groovy |
> |2|Class|staticMethod| { ..args -> Class.staticMethod(args) | same as groovy |
> |3|instance|staticMethod| ERROR groovy.lang.MissingMethodException: | Error
> same as groovy (compile error) |
> |4|Class|instanceMethod|error| Function<RetType,Class,Args..>, where method
> instance method of Class which is declared as ```RetType
> instanceMethod(Args..) {...}```. In other words it is interpreted as a
> function which takes LHS Class as the first parameter which additionally
> inserted to the method.)|
> IMHO, i'd like to propose to change the No 4 pattern semantics of groovy
> same as Java 8 's. Because:
> * You can write:
> {code}
> ["a,b,c"].collect ( String.&toUpperCase )
> {code}
> instaed of
> {code}
> ["a,b,c"].collect { it.toUpperCase() }
> {code}
> * Can have correspond operator to java8's ::. which is understandablea and
> needed for Java programmers.
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