Re: [Help-smalltalk] Dispatching blocks to another context and break for collections

[Paolo Bonzini]

On 06/28/2011 07:49 PM, Holger Hans Peter Freyther wrote:
> copy do: [:each |
>         each isTooOld ifTrue: [^true].
>         each doStuff
>         orig remove: each
> ].
>
>
> Now I started to dispatch the block to another process (to avoid some locking
> issues right now..) but obviously I get a BadReturn when invoking it in
> another Context. Is there something like a 'break' for Iterable>>do:? is there
> any other selector to help me?

There's of course exception handling, but that's pretty heavyweight. 
I've seen people use this:

Iterable>>withBreakDo: aBlock
    break := [ :value | ^self].
    self do: [ :each | aBlock value: each value: break].

so that you can do

copy do: [ :each |
    each isTooOld ifTrue: [break value: true].
    each doStuff
    orig remove: each ]

> One thing I can think of is something like this...
>
> [copy isEmpty not and: [copy first isJounEnough]] whileTrue: [].
>
> anything else?

This one definitely has better performance.

Paolo