Re: [jamboost] container.jam question

From: Rene Rivera (grafik666_at_[hidden])
Date: 2002-07-02 11:09:39

[2002-07-02] Vladimir Prus wrote:

>
>I want to write a rule which returns a pair of lists. Looking at 
>container.jam, it is not obvious how to do it. Rene, can you suggest 
>something -- now it looks like one cannot use ordinary jam lists as
elements 
>of "list" class. I'd like to be able to:
>
> l = new list ;
> $(l). push-back 1 2 3 4 5 ;
> $(l).push-back 1 2 3 ;

That should mostly work, but yes it will produce only one list, ( 1 2 3 4 5
1 2 3).

What you want is this instead...

l = [ new list ] ;
$(l).push-back [ new list 1 2 3 4 5 ] ;
$(l).push-back [ new list 1 2 3 ];

Getting at subelements is bit tricky, but jam doesn't have an easy way :-(

l0 = [ $(l).at 0 ] ;
ECHO [ $(l0).at 0 ] ; # >> 1

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