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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"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" aria-expanded="true" href="../j-b-condition-system-concepts.html">9. Conditions</a></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="../j-b-condition-system-concepts.html">9.1 Condition System Concepts</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--active" aria-expanded="true" tabindex="0" href="../../category/92-conditions-dictionary.html">9.2 Conditions Dictionary</a><button aria-label="Collapse sidebar category '9.2 Conditions Dictionary'" type="button" class="clean-btn menu__caret"></button></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="assert_macro.html">assert</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="break-on-signals_variable.html">break-on-signals</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="break_function.html">break</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="cell-error-name_function.html">cell-error-name</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="cell-error_condition-type.html">cell-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="cerror_function.html">cerror</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="check-type_macro.html">check-type</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="compute-restarts_function.html">compute-restarts</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="condition_condition-type.html">condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="debugger-hook_variable.html">debugger-hook</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="define-condition_macro.html">define-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="error_condition-type.html">error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="error_function.html">error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="find-restart_function.html">find-restart</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="handler-bind_macro.html">handler-bind</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="handler-case_macro.html">handler-case</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="ignore-errors_macro.html">ignore-errors</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="invalid-method-error_function.html">invalid-method-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="invoke-debugger_function.html">invoke-debugger</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="invoke-restart-interactively_function.html">invoke-restart-interactively</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="invoke-restart_function.html">invoke-restart</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="make-condition_function.html">make-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="method-combination-error_function.html">method-combination-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="parse-error_condition-type.html">parse-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="restart-bind_macro.html">restart-bind</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="restart-case_macro.html">restart-case</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="restart-name_function.html">restart-name</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="restart_system-class.html">restart</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="serious-condition_condition-type.html">serious-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="signal_function.html">signal</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="simple-condition_condition-type.html">simple-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="simple-error_condition-type.html">simple-error</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="simple-warning_condition-type.html">simple-warning</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="storage-condition_condition-type.html">storage-condition</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="style-warning_condition-type.html">style-warning</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="warn_function.html">warn</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="warning_condition-type.html">warning</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="with-condition-restarts_macro.html">with-condition-restarts</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="with-simple-restart_macro.html">with-simple-restart</a></li></ul></li></ul></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. Portability</a></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="../../dictionary-entries.html">dictionary-entries</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-26/intro.html">Glossary</a></div></li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="../../index.html"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">9. Conditions</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="../../category/92-conditions-dictionary.html"><span itemprop="name">9.2 Conditions Dictionary</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">define-condition</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>define-condition</h1>
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<!-- -->
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<!-- -->
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<p><strong>define-condition</strong> <span><i>Macro</i></span></p>
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<p><strong>Syntax:</strong></p>
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<p><span><b>define-condition</b></span> <span><i>name</i></span> (<em>{parent-type}</em>*) (<em>{↓slot-spec}</em>*) <em>{option}</em>*</p>
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<p>→ name</p>
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<p><em>slot-spec::</em>=<em>slot-name |</em> (<em>slot-name ↓slot-option</em>)</p>
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<p><em>slot-option::</em>=[[ <em>{</em>:reader<!-- --> <span><i>symbol}</i></span>* <em>|</em></p>
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<p><em>{</em>:writer<!-- --> <em>↓function-name}</em>* <em>|</em></p>
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<p><em>{</em>:accessor<!-- --> <span><i>symbol}</i></span>* <em>|</em></p>
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<p><em>{</em>:allocation<!-- --> <em>↓allocation-type} |</em></p>
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<p><em>{</em>:initarg<!-- --> <span><i>symbol}</i></span>* <em>|</em></p>
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<p><em>{</em>:initform<!-- --> <em>form} |</em></p>
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<p><em>{</em>:type<!-- --> <em>type-specifier}</em> ]]</p>
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<p><em>option::</em>=[[(<!-- -->:default-initargs<!-- --> . <em>initarg-list</em>) <em>|</em></p>
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<p>(<!-- -->:documentation<!-- --> <span><i>string</i></span>) <em>|</em></p>
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<p>(<!-- -->:report<!-- --> <em>report-name</em>) ]]</p>
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<span><b>define-condition</b></span>
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<p><em>function-name::</em>=<em>{symbol |</em> (setf <span><i>symbol</i></span>)<em>}</em></p>
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<p><em>allocation-type::</em>=<!-- -->:instance<!-- --> <em>|</em> <!-- -->:class</p>
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<p><em>report-name::</em>=<em>string | symbol | lambda expression</em></p>
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<p><strong>Arguments and Values:</strong></p>
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<p><span><i>name</i></span>—a <span><i>symbol</i></span>.</p>
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<p><em>parent-type</em>—a <span><i>symbol</i></span> naming a <em>condition type</em>. If no <em>parent-types</em> are supplied, the <em>parent-types</em> default to (condition).</p>
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<p><em>default-initargs</em>—a <span><i>list</i></span> of <span><i>keyword/value pairs</i></span>.</p>
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<p><em>Slot-spec</em> – the <span><i>name</i></span> of a <span><i>slot</i></span> or a <span><i>list</i></span> consisting of the <em>slot-name</em> followed by zero or more <em>slot-options</em>.</p>
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<p><em>Slot-name</em> – a slot name (a <span><i>symbol</i></span>), the <span><i>list</i></span> of a slot name, or the <span><i>list</i></span> of slot name/slot form pairs. <em>Option</em> – Any of the following:</p>
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<p>:reader</p>
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<p>:reader<!-- --> can be supplied more than once for a given <span><i>slot</i></span> and cannot be <span><b>nil</b></span>.</p>
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<p>:writer</p>
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<p>:writer<!-- --> can be supplied more than once for a given <span><i>slot</i></span> and must name a <span><i>generic function</i></span>. <!-- -->:accessor</p>
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<p>:accessor<!-- --> can be supplied more than once for a given <span><i>slot</i></span> and cannot be <span><b>nil</b></span>.</p>
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<p>:allocation</p>
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<p>:allocation<!-- --> can be supplied once at most for a given <span><i>slot</i></span>. The default if <!-- -->:allocation<!-- --> is not supplied is <!-- -->:instance<!-- -->.</p>
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<p>:initarg</p>
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<p>:initarg<!-- --> can be supplied more than once for a given <span><i>slot</i></span>.</p>
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<p>:initform</p>
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<p>:initform<!-- --> can be supplied once at most for a given <span><i>slot</i></span>.</p>
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<p>:type</p>
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<p>:type<!-- --> can be supplied once at most for a given <span><i>slot</i></span>.</p>
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<span><b>define-condition</b></span>
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<p>:documentation</p>
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<p>:documentation<!-- --> can be supplied once at most for a given <span><i>slot</i></span>.</p>
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<p>:report</p>
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<p>:report<!-- --> can be supplied once at most.</p>
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<p><strong>Description:</strong></p>
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<p><span><b>define-condition</b></span> defines a new condition type called <span><i>name</i></span>, which is a <span><i>subtype</i></span> of the <span><i>type</i></span> or <span><i>types</i></span> named by <em>parent-type</em>. Each <em>parent-type</em> argument specifies a direct <span><i>supertype</i></span> of the new <span><i>condition</i></span>. The new <span><i>condition</i></span> inherits <span><i>slots</i></span> and <span><i>methods</i></span> from each of its direct <span><i>supertypes</i></span>, and so on.</p>
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<p>If a slot name/slot form pair is supplied, the slot form is a <span><i>form</i></span> that can be evaluated by <span><b>make-condition</b></span> to produce a default value when an explicit value is not provided. If no slot form is supplied, the contents of the <span><i>slot</i></span> is initialized in an <span><i>implementation-dependent</i></span> way.</p>
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<p>If the <span><i>type</i></span> being defined and some other <span><i>type</i></span> from which it inherits have a slot by the same name, only one slot is allocated in the <span><i>condition</i></span>, but the supplied slot form overrides any slot form that might otherwise have been inherited from a <em>parent-type</em>. If no slot form is supplied, the inherited slot form (if any) is still visible.</p>
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<p>Accessors are created according to the same rules as used by <span><b>defclass</b></span>.</p>
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<p>A description of <em>slot-options</em> follows:</p>
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<p>:reader</p>
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<p>The <!-- -->:reader<!-- --> slot option specifies that an <span><i>unqualified method</i></span> is to be defined on the <span><i>generic function</i></span> named by the argument to <!-- -->:reader<!-- --> to read the value of the given <span><i>slot</i></span>.</p>
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<p><em>•</em> The <!-- -->:initform<!-- --> slot option is used to provide a default initial value form to be used in the initialization of the <span><i>slot</i></span>. This <span><i>form</i></span> is evaluated every time it is used to initialize the <span><i>slot</i></span>. The <span><i>lexical environment</i></span> in which this <span><i>form</i></span> is evaluated is the lexical <span><i>environment</i></span> in which the <span><b>define-condition</b></span> form was evaluated. Note that the <span><i>lexical environment</i></span> refers both to variables and to <span><i>functions</i></span>. For <span><i>local slots</i></span>, the <span><i>dynamic environment</i></span> is the dynamic <span><i>environment</i></span> in which <span><b>make-condition</b></span> was called; for <span><i>shared slots</i></span>, the <span><i>dynamic environment</i></span> is the <span><i>dynamic environment</i></span> in which the <span><b>define-condition</b></span> form was evaluated.</p>
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<p>No implementation is permitted to extend the syntax of <span><b>define-condition</b></span> to allow (<em>slot-name form</em>) as an abbreviation for (<em>slot-name</em> <!-- -->:initform<!-- --> <span><i>form</i></span>).</p>
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<p>:initarg</p>
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<p>The <!-- -->:initarg<!-- --> slot option declares an initialization argument named by its <span><i>symbol</i></span> argument and specifies that this initialization argument initializes the given <span><i>slot</i></span>. If the initialization</p>
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<span><b>define-condition</b></span>
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<p>argument has a value in the call to <span><b>initialize-instance</b></span>, the value is stored into the given <span><i>slot</i></span>, and the slot’s <!-- -->:initform<!-- --> slot option, if any, is not evaluated. If none of the initialization arguments specified for a given <span><i>slot</i></span> has a value, the <span><i>slot</i></span> is initialized according to the <!-- -->:initform<!-- --> slot option, if specified.</p>
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<p>:type</p>
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<p>The <!-- -->:type<!-- --> slot option specifies that the contents of the <span><i>slot</i></span> is always of the specified <span><i>type</i></span>. It effectively declares the result type of the reader generic function when applied to an <span><i>object</i></span> of this <span><i>condition</i></span> type. The consequences of attempting to store in a <span><i>slot</i></span> a value that does not satisfy the type of the <span><i>slot</i></span> is undefined.</p>
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<p>:default-initargs</p>
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<p>This option is treated the same as it would be <span><b>defclass</b></span>.</p>
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<p>:documentation</p>
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<p>The <!-- -->:documentation<!-- --> slot option provides a <span><i>documentation string</i></span> for the <span><i>slot</i></span>.</p>
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<p>:report</p>
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<p><span><i>Condition</i></span> reporting is mediated through the <span><b>print-object</b></span> method for the <span><i>condition</i></span> type in question, with <span><b>*print-escape*</b></span> always being <span><b>nil</b></span>. Specifying (<!-- -->:report<!-- --> <em>report-name</em>) in the definition of a condition type C is equivalent to:</p>
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<p>(defmethod print-object ((x c) stream)</p>
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<p>(if *print-escape* (call-next-method) (<em>report-name</em> x stream)))</p>
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<p>If the value supplied by the argument to <!-- -->:report<!-- --> (<em>report-name</em>) is a <span><i>symbol</i></span> or a <span><i>lambda expression</i></span>, it must be acceptable to <span><b>function</b></span>. (function <em>report-name</em>) is evaluated in the current <span><i>lexical environment</i></span>. It should return a <span><i>function</i></span> of two arguments, a <span><i>condition</i></span> and a <span><i>stream</i></span>, that prints on the <span><i>stream</i></span> a description of the <span><i>condition</i></span>. This <span><i>function</i></span> is called whenever the <span><i>condition</i></span> is printed while <span><b>*print-escape*</b></span> is <span><b>nil</b></span>.</p>
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<p>If <em>report-name</em> is a <span><i>string</i></span>, it is a shorthand for</p>
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<p>(lambda (condition stream)</p>
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<p>(declare (ignore condition))</p>
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<p>(write-string <em>report-name</em> stream))</p>
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<p>This option is processed after the new <span><i>condition</i></span> type has been defined, so use of the <span><i>slot</i></span> accessors within the <!-- -->:report<!-- --> function is permitted. If this option is not supplied, information about how to report this type of <span><i>condition</i></span> is inherited from the <em>parent-type</em>.</p>
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<p>The consequences are unspecifed if an attempt is made to <span><i>read</i></span> a <span><i>slot</i></span> that has not been explicitly initialized and that has not been given a default value.</p>
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<p>The consequences are unspecified if an attempt is made to assign the <span><i>slots</i></span> by using <span><b>setf</b></span>.</p>
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<span><b>define-condition</b></span>
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<p>If a <span><b>define-condition</b></span> <span><i>form</i></span> appears as a <span><i>top level form</i></span>, the <span><i>compiler</i></span> must make <span><i>name</i></span> recognizable as a valid <span><i>type</i></span> name, and it must be possible to reference the <em>condition type</em> as the <em>parent-type</em> of another <em>condition type</em> in a subsequent <span><b>define-condition</b></span> <span><i>form</i></span> in the <span><i>file</i></span> being compiled.</p>
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<p><strong>Examples:</strong></p>
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<div class="language-lisp codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-lisp codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">The following form defines a condition of *type* peg/hole-mismatch which inherits from a condition type called blocks-world-error: </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">define-condition</span><span class="token plain"> peg/hole-mismatch </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">blocks-world-error</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">peg-shape</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:peg-shape</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> peg/hole-mismatch-peg-shape</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">hole-shape</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:hole-shape</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> peg/hole-mismatch-hole-shape</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lambda keyword" style="color:#00009f">lambda</span><span class="token lambda"> </span><span class="token lambda punctuation" style="color:#393A34">(</span><span class="token lambda arguments argument variable" style="color:#36acaa">condition</span><span class="token lambda arguments"> </span><span class="token lambda arguments argument variable" style="color:#36acaa">stream</span><span class="token lambda punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">format</span><span class="token plain"> stream </span><span class="token string" style="color:#e3116c">"</span><span class="token string argument" style="color:#e3116c">A</span><span class="token string" style="color:#e3116c"> ~</span><span class="token string argument" style="color:#e3116c">A</span><span class="token string" style="color:#e3116c"> peg cannot go in a ~</span><span class="token string argument" style="color:#e3116c">A</span><span class="token string" style="color:#e3116c"> hole."</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">peg/hole-mismatch-peg-shape</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">peg/hole-mismatch-hole-shape</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">The new type has slots peg-shape and hole-shape, so **make-condition** accepts </span><span class="token lisp-property property" style="color:#36acaa">:peg-shape</span><span class="token plain"> and </span><span class="token lisp-property property" style="color:#36acaa">:hole-shape</span><span class="token plain"> keywords. The *readers* peg/hole-mismatch-peg-shape and peg/hole-mismatch-hole-shape apply to objects of this type, as illustrated in the </span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> information. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">The following form defines a *condition type* named machine-error which inherits from **error**: </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">define-condition</span><span class="token plain"> machine-error </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">error</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">machine-name</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:machine-name</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> machine-error-machine-name</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lambda keyword" style="color:#00009f">lambda</span><span class="token lambda"> </span><span class="token lambda punctuation" style="color:#393A34">(</span><span class="token lambda arguments argument variable" style="color:#36acaa">condition</span><span class="token lambda arguments"> </span><span class="token lambda arguments argument variable" style="color:#36acaa">stream</span><span class="token lambda punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">format</span><span class="token plain"> stream </span><span class="token string" style="color:#e3116c">"There is a problem with ~</span><span class="token string argument" style="color:#e3116c">A</span><span class="token string" style="color:#e3116c">."</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">machine-error-machine-name</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Building on this definition, a new error condition can be defined which is a subtype of machine-error for use when machines are not available: </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">define-condition</span><span class="token plain"> machine-not-available-error </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">machine-error</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lambda keyword" style="color:#00009f">lambda</span><span class="token lambda"> </span><span class="token lambda punctuation" style="color:#393A34">(</span><span class="token lambda arguments argument variable" style="color:#36acaa">condition</span><span class="token lambda arguments"> </span><span class="token lambda arguments argument variable" style="color:#36acaa">stream</span><span class="token lambda punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">format</span><span class="token plain"> stream </span><span class="token string" style="color:#e3116c">"The machine ~</span><span class="token string argument" style="color:#e3116c">A</span><span class="token string" style="color:#e3116c"> is not available."</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">machine-error-machine-name</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">This defines a still more specific condition, built upon machine-not-available-error, which provides a slot initialization form for machine-name but which does not provide any new slots or report information. It just gives the machine-name slot a default initialization: </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">define-condition</span><span class="token plain"> my-favorite-machine-not-available-error </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">machine-not-available-error</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">machine-name</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initform</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"mc.lcs.mit.edu"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Note that since no </span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> clause was given, the information inherited from machine-not-available-error is used to report this type of condition. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">define-condition</span><span class="token plain"> ate-too-much </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">error</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">person</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:person</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> ate-too-much-person</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">weight</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:weight</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> ate-too-much-weight</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">kind-of-food</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:kind-of-food</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:ate-too-much-kind-of-food</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ ATE-TOO-MUCH </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">define-condition</span><span class="token plain"> ate-too-much-ice-cream </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">ate-too-much</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">kind-of-food</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initform</span><span class="token plain"> ’ice-cream</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">flavor</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initarg</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:flavor</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> ate-too-much-ice-cream-flavor </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:initform</span><span class="token plain"> ’vanilla </span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lisp-property property" style="color:#36acaa">:report</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lambda keyword" style="color:#00009f">lambda</span><span class="token lambda"> </span><span class="token lambda punctuation" style="color:#393A34">(</span><span class="token lambda arguments argument variable" style="color:#36acaa">condition</span><span class="token lambda arguments"> </span><span class="token lambda arguments argument variable" style="color:#36acaa">stream</span><span class="token lambda punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">format</span><span class="token plain"> stream </span><span class="token string" style="color:#e3116c">"~</span><span class="token string argument" style="color:#e3116c">A</span><span class="token string" style="color:#e3116c"> ate too much ~</span><span class="token string argument" style="color:#e3116c">A</span><span class="token string" style="color:#e3116c"> ice-cream"</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">ate-too-much-person</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">ate-too-much-ice-cream-flavor</span><span class="token plain"> condition</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ ATE-TOO-MUCH-ICE-CREAM </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">make-condition</span><span class="token plain"> ’ate-too-much-ice-cream </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:person</span><span class="token plain"> ’fred </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:weight</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">300</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:flavor</span><span class="token plain"> ’chocolate</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ #<ATE-TOO-MUCH-ICE-CREAM 32236101> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">format</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">t</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"~A"</span><span class="token plain"> \*</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">▷ FRED ate too much CHOCOLATE ice-cream </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ NIL </span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" 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<p><strong>See Also:</strong></p>
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<p><span><b>make-condition</b></span>, <span><b>defclass</b></span>, Section 9.1 (Condition System Concepts)</p>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="expanded-reference-define-condition">Expanded Reference: define-condition<a href="define-condition_macro.html#expanded-reference-define-condition" class="hash-link" aria-label="Direct link to Expanded Reference: define-condition" title="Direct link to Expanded Reference: define-condition"></a></h2>
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<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>TODO: Please contribute to this page by adding explanations and examples</p></div></div>
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