Re: GOOPS functional setter

[tomas@tuxteam.de]

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On Sat, Jan 14, 2017 at 03:16:10PM -0600, Christopher Allan Webber wrote:
> tomas@tuxteam.de writes:
> 
> > Curiously, Jan (also in this thread) came up with "clone",
> > independently.
> 
> Yes you're right. :)
> 
> Speaking of Jan and I both thinking about clone'ish things [...]

> Here's what it looks like in practice, adapting from the
> (srfi srfi-9 gnu) code:
> 
>   (define fsf-address
>     (make <address>
>       #:street "Franklin Street"
>       #:city "Boston"
>       #:country "USA"))
> 
>   (define rms
>     (make <person>
>       #:age 30
>       #:email "rms@gnu.org"
>       #:address fsf-address))
> 
>   (define new-rms
>     (clone rms
>            ((.age) 60)
>            ((.address .street) "Temple Place")))
> 
>   scheme@(guile-user)> (.age rms)
>   $12 = 30
>   scheme@(guile-user)> (.age new-rms)
>   $13 = 60
>   scheme@(guile-user)> (.street (.address rms))
>   $14 = "Franklin Street"
>   scheme@(guile-user)> (.street (.address new-rms))
>   $15 = "Temple Place"
> 
> ... not bad, eh?

You folks rock, seriously :-)

> Updated copy of goops-functional-setter.scm attached!  What do other
> people think?  Should I try to get this upstream in Guile?

I'd love that kind of interface. Feels pretty natural.

regards
- -- t
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