83 lines
3.5 KiB
HTML
83 lines
3.5 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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>Prompts (Guile Reference Manual)</title>
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<meta name="description" content="Prompts (Guile Reference Manual)">
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<meta name="keywords" content="Prompts (Guile Reference Manual)">
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<meta name="Generator" content=".texi2any-real">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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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="Control-Mechanisms.html" rel="up" title="Control Mechanisms">
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<link href="Continuations.html" rel="next" title="Continuations">
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<link href="while-do.html" rel="prev" title="while do">
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Prompts">
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<div class="nav-panel">
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<p>
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Next: <a href="Continuations.html" accesskey="n" rel="next">Continuations</a>, Previous: <a href="while-do.html" accesskey="p" rel="prev">Iteration mechanisms</a>, Up: <a href="Control-Mechanisms.html" accesskey="u" rel="up">Controlling the Flow of Program Execution</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="subsection" id="Prompts-1"><span>6.11.5 Prompts<a class="copiable-link" href="#Prompts-1"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-prompts"></a>
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<a class="index-entry-id" id="index-delimited-continuations"></a>
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<a class="index-entry-id" id="index-composable-continuations"></a>
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<a class="index-entry-id" id="index-non_002dlocal-exit"></a>
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<p>Prompts are control-flow barriers between different parts of a program. In the
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same way that a user sees a shell prompt (e.g., the Bash prompt) as a barrier
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between the operating system and her programs, Scheme prompts allow the Scheme
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programmer to treat parts of programs as if they were running in different
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operating systems.
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</p>
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<p>We use this roundabout explanation because, unless you’re a functional
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programming junkie, you probably haven’t heard the term, “delimited, composable
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continuation”. That’s OK; it’s a relatively recent topic, but a very useful
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one to know about.
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</p>
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<ul class="mini-toc">
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<li><a href="Prompt-Primitives.html" accesskey="1">Prompt Primitives</a></li>
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<li><a href="Shift-and-Reset.html" accesskey="2">Shift, Reset, and All That</a></li>
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</ul>
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</div>
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</body>
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</html>
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