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https://issues.apache.org/jira/browse/GROOVY-10597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles reassigned GROOVY-10597:
------------------------------------
Assignee: Eric Milles
> STC: support spread arguments for varargs
> -----------------------------------------
>
> Key: GROOVY-10597
> URL: https://issues.apache.org/jira/browse/GROOVY-10597
> Project: Groovy
> Issue Type: Improvement
> Components: Static Type Checker
> Affects Versions: 4.0.2
> Reporter: Christopher Smith
> Assignee: Eric Milles
> Priority: Minor
>
> I have a varargs method that takes many parameters for inclusion into an
> output JSON array. I am needing to preprocess some of these parameters, and I
> tried to use the spread operator to deconstruct them inline. However, I'm
> receiving the error "The spread operator cannot be used" because the compiler
> can't determine arity.
> This is perfectly sensible, but in the specific case where the spread
> operator would be applied in a position where its values expand into a
> varargs, as long as the element type produced by the spread is a subtype of
> the declared varargs type, it would be helpful for the spread to succeed.
> Sample:
> {code:groovy}
> @CompileStatic
> class Groovy10597 {
> static void output(int code, String... widgets) {
> println "$code: ${Arrays.toString(widgets)}"
> }
> static List<String> createWidgets() {
> ['w1', 'w2']
> }
> static void sample() {
> output(42, 'w0', *createWidgets(), 'w3')
> }
> }
> {code}
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