[jira] [Resolved] (GROOVY-5746) Array assignment with operator does double call for index expression and array part

["Eric Milles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-5746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles resolved GROOVY-5746.
---------------------------------
    Fix Version/s: 4.0.0-beta-2
       Resolution: Fixed

> Array assignment with operator does double call for index expression and array part
> -----------------------------------------------------------------------------------
>
>                 Key: GROOVY-5746
>                 URL: https://issues.apache.org/jira/browse/GROOVY-5746
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static compilation
>    Affects Versions: 2.0.5, 2.3.0, 2.4.0-rc-1
>            Reporter: Jochen Theodorou
>            Assignee: Eric Milles
>            Priority: Major
>             Fix For: 4.0.0-beta-2
>
>
> {code:Java}
> @groovy.transform.CompileStatic
> class IndexTest {
>     private int f = 0
>     public int getIndex() {f++;0}
>     def foo() {
>         List<String> x = ["1","2"]
>         x[index] += "1"
>         assert x[0] == "11"
>         assert f == 1
>     }
> }
> def x = new IndexTest()
> x.foo()
> {code}
> The program above shows code in which we use an operator in combination with array assignment and an index with a side effect. This code must run without calling getIndex() twice. Since the field f is incremented twice, this is not the case. Normal Groovy executed the code as wished. The probable implementation is x[index] = x[index] + "1", which not only evals index twice, but also x. x and index must be evaluated only once!



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