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Re: various comments

This page is part of the web mail archives of SRFI 25 from before July 7th, 2015. The new archives for SRFI 25 contain all messages, not just those from before July 7th, 2015.

Jussi Piitulainen <jpiitula@xxxxxxxxxxxxxxxx> writes:

> If I do so:
> (define vec (vector "a" "b" "c"))
> (define arr (share-array vec (shape 0 3) (lambda (j) (- 2 j))))
> Then vec is a simple R5RS vector, but it is also the backing vector of
> arr, and thus sharable and indeed shared, though it does not know it,
> so to speak.
> Now if I do further:
> (define arr1 (share-array arr (shape 0 3) (lambda (j) (- 2 j))))
> Then I get essentially the same array as vec. Its implementation might
> be more expensive, though, while vec remains oblivious to all that is
> going on.

In fact SCM will define arr1 as the original vector vec in this case.