Hi Phil,
Try using multimethods. You'll need to unpack your 3-element sequence
first, though.
USE: multi-methods
GENERIC: foo
METHOD: foo { integer string integer } ... ;
{ 1 "hello" 3 } first3 foo
Slava
On 4-Mar-08, at 9:29 AM, Phil Dawes wrote:
> Hi Dan, Hi Factor List
>
> Last night I was looking for a pattern matching library and found your
> post on extra/inverse. I just wanted to check that I'm not missing
> a trick:
>
> I want to match 3 elt sequences, but after the match I want the seq as
> it was (i.e. not destructured). I'm doing the following:
>
> e.g. matching { 1 "hello" 3 }
>
> {
> ! this one doesn't match
> { [ >r >r >fixnum r> >fixnum r> >string 3array ] [ 3array
> dosomething ] }
>
> ! this one matches
> { [ >r >r >fixnum r> >string r> >fixnum 3array ] [ 3array
> dosomething2 ] }
>
> } switch
>
> Is this a reasonable way to achieve this with inverse or am I
> overlooking something simpler?
>
> Many thanks,
>
> Phil
>
>
>
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