[
https://issues.apache.org/jira/browse/GROOVY-12097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Paul King resolved GROOVY-12097.
--------------------------------
Fix Version/s: 6.0.0-alpha-2
Resolution: Fixed
> a[index] = expr evaluates RHS before index, breaking left-to-right evaluation
> order
> -----------------------------------------------------------------------------------
>
> Key: GROOVY-12097
> URL: https://issues.apache.org/jira/browse/GROOVY-12097
> Project: Groovy
> Issue Type: Bug
> Reporter: Paul King
> Assignee: Paul King
> Priority: Major
> Labels: breaking
> Fix For: 6.0.0-alpha-2
>
>
> bq. AI read: The intent of GROOVY-2556 was to stop double-evaluating the
> object/index in compound subscript assignments (x[i] += v) — the first hunk
> of that commit. Reordering plain = was an unintended side effect of the
> "related problems" cleanup.
> GROOVY-2556 fixed some cases involved array expressions with side effects but
> also changed the index value on the LHS of an assignment. The following Java
> and Groovy program gave the same result prior to the change (Groovy 1.5.2ish)
> but the behavior below since then:
> {code:groovy}
> public class C {
> public static void main(String[] args) {
> int[] a = new int[]{-1, -1, -1, -1};
> int x = 0;
> int y = 3;
> a[x] = x++;
> a[y] = --y;
> System.out.println("[" + a[0] + "," + a[1] + "," + a[2] + "," + a[3] +
> "]");
> // Groovy: [-1,0,2,-1], Java: [0,-1,-1,2]
> }
> }
> {code}
> JLS Links for comparison with Java (Java SE 21 JLS):
> * §15.7 (left-to-right):
> https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.7
> * §15.26.1 (the array-assignment order):
> https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.26.1
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
