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

From: Jean Abou Samra
Subject: Re: [PATCH] Add 'bytevector-slice'.
Date: Wed, 11 Jan 2023 16:29:56 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0

Hi Ludovic,

Le 11/01/2023 à 16:00, Ludovic Courtès a écrit :
+@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.

What do you think about making it more similar to substrings?
There the 'substring' procedure makes a copy-on-write substring,
and you have substring/shared if you really want shared mutation.
Would something like this be meaningful / feasible / useful
for bytevectors?


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