How to copy hash table?

How to copy hash table?

[Roland Orre]

In earlier guiles, where hash-tables were vectors, I used copy-tree to
copy a hash table. Now in guile-1.7 copy-tree of the hash-table gives me
the same hash table back, which I assume is correct for atomic objects.

What I want is a table where the handles are copies so when modifying the
values in the new table it won't affect the original.

I guess there exists no trick to generally copy objects.

(Of course, for now, to overcome this I'm using hash-for-each but I'm
 curios about the general issue)

/Roland




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Re: How to copy hash table?

[Mikael Djurfeldt]

Roland Orre <roland.orre@neurologic.se> writes:

> In earlier guiles, where hash-tables were vectors, I used copy-tree to
> copy a hash table. Now in guile-1.7 copy-tree of the hash-table gives me
> the same hash table back, which I assume is correct for atomic objects.
>
> What I want is a table where the handles are copies so when modifying the
> values in the new table it won't affect the original.
>
> I guess there exists no trick to generally copy objects.
>
> (Of course, for now, to overcome this I'm using hash-for-each but I'm
>  curios about the general issue)

You're right that hash-for-each is currently the best way to do it.

Do people feel that we should have a primitive

  hash-copy

?

M


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