Thanks Alex, That was just what I needed.
I ended up using the (mapcar copy List) code in some disturbingly
inefficient code. I still
don't know enough to turn it into something that doesn't need it, but my
hope is that
as I work on it I'll find it.

On Wed, Dec 7, 2016 at 4:05 PM, Danilo Kordic <danilo.kor...@gmail.com>
wrote:

> `symbols'?  :) Although I can imagine only "tiny" namespaces.
>
> On 12/5/16, Alexander Burger <a...@software-lab.de> wrote:
> > Hi Jakob,
> >
> >> I like how you give both a rationale (of sorts) against, then a
> >> demonstration nevertheless of a deep copy. Very friendly! :)
> >
> > The main reason against deep copy is efficiency. In a typical application
> > with
> > huge data structures, you will want to change parts of it often. If you
> copy
> > the
> > whole structure each time, you need lots of computing time and processing
> > power.
> >
> > For a demonstration - as I said - I have none ;)
> >
> > Cheers,
> > - Alex
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