[GROOVY-3553] Update Multiple Assignment feature to allow arbitrary expressions, not just simple variables

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.6.3
• Component/s: Compiler
• Assignee: Unassigned
• Reporter: alpheratz
• Created: 27/May/09 02:06
• Updated: 27/May/09 02:06

Description

Consider this simple test:

def f()

{ [1, 2] }

class X

{ def a def b }

// OK
def (int a, int b) = f()
def (aok, bok) = f()

// error: expecting ')', found ',' at line: 16, column: 5
def x = new X()
(x.a, x.b) = f()
(x.@a, x.@b) = f()

println "$x.a, $x.b"

I found this error surprising...I would like to see fields/arrays/etc. (general lvalues) supported.

The current "Multiple simple variable initialisation" facility leads to surprise and cumbersome code, as in what got me fired up:

def (int centerX, int centerY) = findCenter(model.boundingPolygon)
model.boundingPolygonCenterX = centerX
model.boundingPolygonCenterY = centerY

Strikes ME as being appropriate for 1.7...

Sub-Tasks

• Update documentation to reflect current limitation of Multiple Assignment feature: Closed