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docSidebarContainer_YfHR"><div class="sidebarViewport_aRkj"><div class="sidebar_njMd"><nav aria-label="Docs sidebar" class="menu thin-scrollbar menu_SIkG"><ul class="theme-doc-sidebar-menu menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="../index.html">Introduction</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-0/intro.html">Contents and Figures</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-1/b-b-scope-purpose-and-history.html">1. Introduction</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-2/c-b-character-syntax.html">2. Syntax</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-3/d-b-evaluation.html">3. Evaluation and Compilation</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-4/e-b-introduction.html">4. Types and Classes</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-5/f-b-generalized-reference.html">5. Data and Control Flow</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-6/g-b-the-loop-facility.html">6. Iteration</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-7/h-b-object-creation-and-initialization.html">7. Objects</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../category/81-structures-dictionary.html">8. Structures</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-9/j-b-condition-system-concepts.html">9. Conditions</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-10/ba-b-symbol-concepts.html">10. Symbols</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-11/bb-b-package-concepts.html">11. Packages</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-12/bc-b-number-concepts.html">12. Numbers</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-13/bd-b-character-concepts.html">13. Characters</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-14/be-b-cons-concepts.html">14. Conses</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-15/bf-b-array-concepts.html">15. Arrays</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-16/bg-b-string-concepts.html">16. Strings</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-17/bh-b-sequence-concepts.html">17. Sequences</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-18/bi-b-hash-table-concepts.html">18. Hash Tables</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-19/bj-b-overview-of-filenames.html">19. Filenames</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-20/ca-b-file-system-concepts.html">20. Files</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-21/cb-b-stream-concepts.html">21. Streams</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-22/cc-b-the-lisp-printer.html">22. Printer</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-23/cd-b-reader-concepts.html">23. Reader</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-24/ce-b-system-construction-concepts.html">24. System Construction</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../chap-25/cf-b-the-external-environment.html">25. External Environment</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../environments.html">26. Environments</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../meta-object-protocol.html">27. Meta Object Protocol</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../data-structures.html">28. Data Structures</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="../portability/trivial-packages.html">29. 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1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Glossary</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">I</span><meta itemprop="position" content="2"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>I</h1></header><p><strong>I</strong></p>
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<p><strong>I/O customization variable</strong> <em>n.</em> one of the <span><i>stream variables</i></span> in Figure 26–2, or some other (<span><i>implementation-defined</i></span>) <span><i>stream variable</i></span> that is defined by the <span><i>implementation</i></span> to be an <em>I/O customization variable</em>.</p>
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<p>|</p><p>*debug-io* *error-io* query-io* </p><p>*standard-input* *standard-output* *trace-output*</p>|<p></p>
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<p>| :- |</p>
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<p><strong>Figure 26–2. Standardized I/O Customization Variables</strong></p>
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<p><strong>identical</strong> <em>adj.</em> the <span><i>same</i></span> under <span><b>eq</b></span>.</p>
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<p><strong>identifier</strong> <em>n.</em> 1. a <span><i>symbol</i></span> used to identify or to distinguish <span><i>names</i></span>. 2. a <span><i>string</i></span> used the same way.</p>
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<p><strong>immutable</strong> <em>adj.</em> not subject to change, either because no <span><i>operator</i></span> is provided which is capable of effecting such change or because some constraint exists which prohibits the use of an <span><i>operator</i></span> that might otherwise be capable of effecting such a change. Except as explicitly indicated otherwise, <span><i>implementations</i></span> are not required to detect attempts to modify <em>immutable objects</em> or <span><i>cells</i></span>; the consequences of attempting to make such</p>
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<p>modification are undefined. “Numbers are immutable.”</p>
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<p><strong>implementation</strong> <em>n.</em> a system, mechanism, or body of <span><i>code</i></span> that implements the semantics of Common Lisp.</p>
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<p><strong>implementation limit</strong> <em>n.</em> a restriction imposed by an <span><i>implementation</i></span>.</p>
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<p><strong>implementation-defined</strong> <em>adj. implementation-dependent</em>, but required by this</p>
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<p>specification to be defined by each <span><i>conforming implementation</i></span> and to be documented by the corresponding implementor.</p>
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<p><strong>implementation-dependent</strong> <em>adj.</em> describing a behavior or aspect of Common</p>
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<p>Lisp which has been deliberately left unspecified, that might be defined in some</p>
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<p><span><i>conforming implementations</i></span> but not in others, and whose details may differ between <span><i>implementations</i></span>. A <span><i>conforming implementation</i></span> is encouraged (but not required) to document its treatment of each item in this specification which is marked</p>
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<p><span><i>implementation-dependent</i></span>, although in some cases such documentation might simply identify the item as “undefined.”</p>
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<p><strong>implementation-independent</strong> <em>adj.</em> used to identify or emphasize a behavior or aspect of Common Lisp which does not vary between <span><i>conforming implementations</i></span>.</p>
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<p><strong>implicit block</strong> <em>n.</em> a <span><i>block</i></span> introduced by a <span><i>macro form</i></span> rather than by an explicit <span><b>block</b></span> <span><i>form</i></span>.</p>
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<p><strong>implicit compilation</strong> <em>n. compilation</em> performed during <span><i>evaluation</i></span>.</p>
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<p><strong>implicit progn</strong> <em>n.</em> an ordered set of adjacent <span><i>forms</i></span> appearing in another <span><i>form</i></span>, and defined by their context in that <span><i>form</i></span> to be executed as if within a <span><b>progn</b></span>.</p>
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<p><strong>implicit tagbody</strong> <em>n.</em> an ordered set of adjacent <span><i>forms</i></span> and/or <span><i>tags</i></span> appearing in another <span><i>form</i></span>, and defined by their context in that <span><i>form</i></span> to be executed as if within a <span><b>tagbody</b></span>.</p>
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<p><span><b>import</b></span> <em>v.t.</em> (a <span><i>symbol</i></span> into a <span><i>package</i></span>) to make the <span><i>symbol</i></span> be <span><i>present</i></span> in the <span><i>package</i></span>. <strong>improper list</strong> <em>n.</em> a <span><i>list</i></span> which is not a <span><i>proper list</i></span>: a <span><i>circular list</i></span> or a <span><i>dotted list</i></span>.</p>
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<p><strong>inaccessible</strong> <em>adj.</em> not <span><i>accessible</i></span>.</p>
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<p><strong>indefinite extent</strong> <em>n.</em> an <span><i>extent</i></span> whose duration is unlimited. “Most Common Lisp objects have indefinite extent.”</p>
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<p><strong>indefinite scope</strong> <em>n. scope</em> that is unlimited.</p>
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<p><strong>indicator</strong> <em>n.</em> a <span><i>property indicator</i></span> .</p>
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<p><strong>indirect instance</strong> <em>n.</em> (of a <em>class C</em><sub>1</sub>) an <span><i>object</i></span> of <em>class C</em><sub>2</sub>, where <em>C</em><sub>2</sub> is a <span><i>subclass</i></span> of <em>C</em><sub>1</sub>. “An integer is an indirect instance of the class <span><b>number</b></span>.”</p>
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<p><strong>inherit</strong> <em>v.t.</em> 1. to receive or acquire a quality, trait, or characteristic; to gain access to a feature defined elsewhere. 2. (a <span><i>class</i></span>) to acquire the structure and behavior defined by a <span><i>superclass</i></span>. 3. (a <span><i>package</i></span>) to make <em>symbols exported</em> by another <em>package accessible</em> by using <span><b>use-package</b></span>.</p>
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<p><strong>initial pprint dispatch table</strong> <em>n.</em> the <span><i>value</i></span> of <span><b>*print-pprint-dispatch*</b></span> at the time the <em>Lisp image</em> is started.</p>
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<p><strong>initial readtable</strong> <em>n.</em> the <span><i>value</i></span> of <span><b>*readtable*</b></span> at the time the <em>Lisp image</em> is started.</p>
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<p><strong>initialization argument list</strong> <em>n.</em> a <span><i>property list</i></span> of initialization argument <span><i>names</i></span> and <span><i>values</i></span> used in the protocol for initializing and reinitializing <span><i>instances</i></span> of <em>classes</em>. See Section 7.1 (Object Creation and Initialization).</p>
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<p><strong>initialization form</strong> <em>n.</em> a <span><i>form</i></span> used to supply the initial <span><i>value</i></span> for a <span><i>slot</i></span> or <span><i>variable</i></span>. “The initialization form for a slot in a <span><b>defclass</b></span> form is introduced by the keyword <!-- -->:initform<!-- -->.”</p>
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<p><strong>input</strong> <em>adj.</em> (of a <span><i>stream</i></span>) supporting input operations (<em>i.e.</em>, being a “data source”). An <em>input stream</em> might also be an <em>output stream</em>, in which case it is sometimes called a <em>bidirectional stream</em>. See the <span><i>function</i></span> <strong>input-stream-p</strong>.</p>
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<p><strong>instance</strong> <em>n.</em> 1. a <span><i>direct instance</i></span>. 2. a <span><i>generalized instance</i></span>. 3. an <span><i>indirect instance</i></span>. <span><b>integer</b></span> <em>n.</em> an <span><i>object</i></span> of <span><i>type</i></span> <span><b>integer</b></span>, which represents a mathematical integer.</p>
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<p><strong>interactive stream</strong> <em>n.</em> a <span><i>stream</i></span> on which it makes sense to perform interactive</p>
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<p>querying. See Section 21.1.1.1.3 (Interactive Streams).</p>
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<p><span><b>intern</b></span> <em>v.t.</em> 1. (a <span><i>string</i></span> in a <span><i>package</i></span>) to look up the <span><i>string</i></span> in the <span><i>package</i></span>, returning either a <span><i>symbol</i></span> with that <span><i>name</i></span> which was already <span><i>accessible</i></span> in the <span><i>package</i></span> or a newly created <span><i>internal symbol</i></span> of the <span><i>package</i></span> with that <span><i>name</i></span>. 2. <em>Idiom.</em> generally, to observe a protocol whereby objects which are equivalent or have equivalent names under some predicate defined by the protocol are mapped to a single canonical object.</p>
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<p><strong>internal symbol</strong> <em>n.</em> (of a <span><i>package</i></span>) a symbol which is <span><i>accessible</i></span> in the <span><i>package</i></span>, but which is not an <span><i>external symbol</i></span> of the <span><i>package</i></span>.</p>
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<p><strong>internal time</strong> <em>n. time</em>, represented as an <em>integer</em> number of <span><i>internal time units</i></span>. <em>Absolute internal time</em> is measured as an offset from an arbitrarily chosen,</p>
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<p><span><i>implementation-dependent</i></span> base. See Section 25.1.4.3 (Internal Time).</p>
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<p><strong>internal time unit</strong> <em>n.</em> a unit of time equal to 1*/n* of a second, for some <em>implementation defined integer</em> value of <em>n</em>. See the <span><i>variable</i></span> <span><b>internal-time-units-per-second</b></span>.</p>
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<p><strong>interned</strong> <em>adj. Trad.</em> 1. (of a <span><i>symbol</i></span>) <span><i>accessible</i></span><sub>3</sub> in any <span><i>package</i></span>. 2. (of a <span><i>symbol</i></span> in a specific <span><i>package</i></span>) <span><i>present</i></span> in that <span><i>package</i></span>.</p>
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<p><strong>interpreted function</strong> <em>n.</em> a <span><i>function</i></span> that is not a <span><i>compiled function</i></span>. (It is possible for there to be a <span><i>conforming implementation</i></span> which has no <span><i>interpreted functions</i></span>, but a <span><i>conforming program</i></span> must not assume that all <span><i>functions</i></span> are <span><i>compiled functions</i></span>.)</p>
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<p><strong>interpreted implementation</strong> <em>n.</em> an <span><i>implementation</i></span> that uses an execution strategy for <span><i>interpreted functions</i></span> that does not involve a one-time semantic analysis pre-pass, and instead uses “lazy” (and sometimes repetitious) semantic analysis of <span><i>forms</i></span> as they are encountered during execution.</p>
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<p><strong>interval designator</strong> <em>n.</em> (of <em>type T</em>) an ordered pair of <span><i>objects</i></span> that describe a <span><i>subtype</i></span> of <span><i>T</i></span> by delimiting an interval on the real number line. See Section 12.1.6 (Interval Designators).</p>
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<p><strong>invalid</strong> <em>n.</em>, <em>adj.</em> 1. <em>n.</em> a possible <span><i>constituent trait</i></span> of a <span><i>character</i></span> which if present signifies that the <span><i>character</i></span> cannot ever appear in a <span><i>token</i></span> except under the control of a <em>single escape character</em> . For details, see Section 2.1.4.1 (Constituent Characters). 2. <em>adj.</em> (of a <span><i>character</i></span> ) being a <span><i>character</i></span> that has <em>syntax type constituent</em> in the <span><i>current readtable</i></span> and that has the <em>constituent trait invalid</em> <sub>1</sub>. See Figure 2–8.</p>
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<p><strong>iteration form</strong> <em>n.</em> a <span><i>compound form</i></span> whose <span><i>operator</i></span> is named in Figure 26–3, or a <span><i>compound form</i></span> that has an <em>implementation-defined operator</em> and that is defined by the <span><i>implementation</i></span> to be an <span><i>iteration form</i></span>.</p>
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<p>|</p><p><strong>do do-external-symbols dotimes do* do-symbols loop</strong> </p><p><strong>do-all-symbols dolist</strong></p>|<p></p>
|
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<p>| :- |</p>
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<p><strong>Figure 26–3. Standardized Iteration Forms</strong></p>
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<p><strong>iteration variable</strong> <em>n.</em> a <em>variable V</em> , the <span><i>binding</i></span> for which was created by an <span><i>explicit use</i></span> of <em>V</em> in an <span><i>iteration form</i></span>.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/lisp-docs/cl-language-reference/tree/main/docs/chap-26/i.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> by <b>daninus14</b></span></div></div></footer></article><nav class="pagination-nav 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