86 lines
3.8 KiB
HTML
86 lines
3.8 KiB
HTML
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>SRFI-4 and Bytevectors (Guile Reference Manual)</title>
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<meta name="description" content="SRFI-4 and Bytevectors (Guile Reference Manual)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="SRFI_002d4.html" rel="up" title="SRFI-4">
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<link href="SRFI_002d4-Extensions.html" rel="next" title="SRFI-4 Extensions">
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<body lang="en">
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<div class="subsubsection-level-extent" id="SRFI_002d4-and-Bytevectors">
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<div class="nav-panel">
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<p>
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Next: <a href="SRFI_002d4-Extensions.html" accesskey="n" rel="next">SRFI-4 - Guile extensions</a>, Previous: <a href="SRFI_002d4-API.html" accesskey="p" rel="prev">SRFI-4 - API</a>, Up: <a href="SRFI_002d4.html" accesskey="u" rel="up">SRFI-4 - Homogeneous numeric vector datatypes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsubsection" id="SRFI_002d4-_002d-Relation-to-bytevectors"><span>7.5.5.3 SRFI-4 - Relation to bytevectors<a class="copiable-link" href="#SRFI_002d4-_002d-Relation-to-bytevectors"> ¶</a></span></h4>
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<p>Guile implements SRFI-4 vectors using bytevectors (see <a class="pxref" href="Bytevectors.html">Bytevectors</a>). Often
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when you have a numeric vector, you end up wanting to write its bytes somewhere,
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or have access to the underlying bytes, or read in bytes from somewhere else.
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Bytevectors are very good at this sort of thing. But the SRFI-4 APIs are nicer
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to use when doing number-crunching, because they are addressed by element and
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not by byte.
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</p>
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<p>So as a compromise, Guile allows all bytevector functions to operate on numeric
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vectors. They address the underlying bytes in the native endianness, as one
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would expect.
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</p>
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<p>Following the same reasoning, that it’s just bytes underneath, Guile also allows
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uniform vectors of a given type to be accessed as if they were of any type. One
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can fill a <code class="code">u32vector</code>, and access its elements with
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<code class="code">u8vector-ref</code>. One can use <code class="code">f64vector-ref</code> on bytevectors. It’s
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all the same to Guile.
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</p>
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<p>In this way, uniform numeric vectors may be written to and read from
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input/output ports using the procedures that operate on bytevectors.
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</p>
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<p>See <a class="xref" href="Bytevectors.html">Bytevectors</a>, for more information.
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</p>
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</div>
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</body>
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</html>
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