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Re: [PATCH] Add 'bytevector-slice'.

From: Thompson, David
Subject: Re: [PATCH] Add 'bytevector-slice'.
Date: Wed, 11 Jan 2023 10:21:31 -0500

Hi Ludovic,

On Wed, Jan 11, 2023 at 10:00 AM Ludovic Courtès <> wrote:
> +@node Bytevector Slices
> +@subsubsection Bytevector Slices
> +
> +@cindex subset, of a bytevector
> +@cindex slice, of a bytevector
> +@cindex slice, of a uniform vector
> +As an extension to the R6RS specification, the @code{(rnrs bytevectors
> +gnu)} module provides the @code{bytevector-slice} procedure, which
> +returns a bytevector aliasing part of an existing bytevector.
> +
> +@deffn {Scheme Procedure} bytevector-slice @var{bv} @var{offset} [@var{size}]
> +@deffnx {C Function} scm_bytevector_slice (@var{bv}, @var{offset}, 
> @var{size})
> +Return the slice of @var{bv} starting at @var{offset} and counting
> +@var{size} bytes.  When @var{size} is omitted, the slice covers all
> +of @var{bv} starting from @var{offset}.  The returned slice shares
> +storage with @var{bv}: changes to the slice are visible in @var{bv}
> +and vice-versa.

Just wanted to chime in to say that this is a really great new
feature! Bytevector slices will be very useful for performance
sensitive code that could benefit from using a pre-allocated memory

Really really great stuff! Thank you!

- Dave

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