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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"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" aria-expanded="true" href="../h-b-object-creation-and-initialization.html">7. Objects</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="../h-b-object-creation-and-initialization.html">7.1 Object Creation and Initialization</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="../h-c-changing-the-class-of-an-instance.html">7.2 Changing the Class of an Instance</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="../h-d-reinitializing-an-instance.html">7.3 Reinitializing an Instance</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="../h-e-metaobjects.html">7.4 Meta</a></li><li class="theme-doc-sidebar-item-link 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href="add-method_standard-generic-function.html">add-method</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="allocate-instance_standard-generic-function.html">allocate-instance</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="call-method_make-method_local-macro.html">call-method, make-method</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="call-next-method_local-function.html">call-next-method</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="change-class_standard-generic-function.html">change-class</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" 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href="function-keywords_standard-generic-function.html">function-keywords</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="initialize-instance_standard-generic-function.html">initialize-instance</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-instance_standard-generic-function.html">make-instance</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-instances-obsolete_standard-generic-function.html">make-instances-obsolete</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-load-form-saving-slots_function.html">make-load-form-saving-slots</a></li><li class="theme-doc-sidebar-item-link 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href="unbound-slot-instance_function.html">unbound-slot-instance</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="unbound-slot_condition-type.html">unbound-slot</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="update-instance-for-different-class_standard-generic-function.html">update-instance-for-different-class</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="update-instance-for-redefined-class_standard-generic-function.html">update-instance-for-redefined-class</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-accessors_macro.html">with-accessors</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-slots_macro.html">with-slots</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="../../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. 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">7. Objects</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/77-objects-dictionary.html"><span itemprop="name">7.7 Objects 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">make-load-form</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>make-load-form</h1>
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<p><strong>make-load-form</strong> <span><i>Standard Generic Function</i></span></p>
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<p><strong>Syntax:</strong></p>
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<p><span><b>make-load-form</b></span> <span><i>object</i></span> &optional <em>environment → creation-form</em>[<em>, initialization-form</em>]</p>
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<p><strong>Method Signatures:</strong></p>
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<p><span><b>make-load-form</b></span> (<span><i>object</i></span> <span><b>standard-object</b></span>) &optional <span><i>environment</i></span></p>
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<p><span><b>make-load-form</b></span> (<span><i>object</i></span> <span><b>structure-object</b></span>) &optional <span><i>environment</i></span></p>
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<p><span><b>make-load-form</b></span> (<span><i>object</i></span> <span><b>condition</b></span>) &optional <span><i>environment</i></span></p>
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<p><span><b>make-load-form</b></span> (<span><i>object</i></span> <span><b>class</b></span>) &optional <span><i>environment</i></span></p>
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<p><strong>Arguments and Values:</strong></p>
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<p><span><i>object</i></span>—an <span><i>object</i></span>.</p>
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<p><span><i>environment</i></span>—an <span><i>environment object</i></span>.</p>
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<p><em>creation-form</em>—a <span><i>form</i></span>.</p>
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<p><em>initialization-form</em>—a <span><i>form</i></span>.</p>
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<p><strong>Description:</strong></p>
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<p>The <span><i>generic function</i></span> <span><b>make-load-form</b></span> creates and returns one or two <span><i>forms</i></span>, a <em>creation-form</em> and an <em>initialization-form</em>, that enable <span><b>load</b></span> to construct an <span><i>object</i></span> equivalent to <span><i>object</i></span>. <span><i>Environment</i></span> is an <span><i>environment object</i></span> corresponding to the <span><i>lexical environment</i></span> in which the <span><i>forms</i></span> will be processed.</p>
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<p>The <span><i>file compiler</i></span> calls <span><b>make-load-form</b></span> to process certain <em>classes</em> of <em>literal objects</em>; see Section 3.2.4.4 (Additional Constraints on Externalizable Objects).</p>
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<p><span><i>Conforming programs</i></span> may call <span><b>make-load-form</b></span> directly, providing <span><i>object</i></span> is a <span><i>generalized instance</i></span> of <span><b>standard-object</b></span>, <span><b>structure-object</b></span>, or <span><b>condition</b></span>.</p>
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<p>The creation form is a <span><i>form</i></span> that, when evaluated at <span><b>load</b></span> time, should return an <span><i>object</i></span> that is equivalent to <span><i>object</i></span>. The exact meaning of equivalent depends on the <span><i>type</i></span> of <span><i>object</i></span> and is up to the programmer who defines a <span><i>method</i></span> for <span><b>make-load-form</b></span>; see Section 3.2.4 (Literal Objects in Compiled Files).</p>
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<span><b>make-load-form</b></span>
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<p>The initialization form is a <span><i>form</i></span> that, when evaluated at <span><b>load</b></span> time, should perform further initialization of the <span><i>object</i></span>. The value returned by the initialization form is ignored. If <span><b>make-load-form</b></span> returns only one value, the initialization form is <span><b>nil</b></span>, which has no effect. If <span><i>object</i></span> appears as a constant in the initialization form, at <span><b>load</b></span> time it will be replaced by the equivalent <span><i>object</i></span> constructed by the creation form; this is how the further initialization gains access to the <span><i>object</i></span>.</p>
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<p>Both the <em>creation-form</em> and the <em>initialization-form</em> may contain references to any <span><i>externalizable object</i></span>. However, there must not be any circular dependencies in creation forms. An example of a circular dependency is when the creation form for the object X contains a reference to the object Y, and the creation form for the object Y contains a reference to the object X. Initialization forms are not subject to any restriction against circular dependencies, which is the reason that initialization forms exist; see the example of circular data structures below.</p>
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<p>The creation form for an <span><i>object</i></span> is always <em>evaluated</em> before the initialization form for that <span><i>object</i></span>. When either the creation form or the initialization form references other <span><i>objects</i></span> that have not been referenced earlier in the <span><i>file</i></span> being <em>compiled</em>, the <span><i>compiler</i></span> ensures that all of the referenced <span><i>objects</i></span> have been created before <em>evaluating</em> the referencing <span><i>form</i></span>. When the referenced <span><i>object</i></span> is of a <span><i>type</i></span> which the <span><i>file compiler</i></span> processes using <span><b>make-load-form</b></span>, this involves <em>evaluating</em> the creation form returned for it. (This is the reason for the prohibition against circular references among creation forms).</p>
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<p>Each initialization form is <em>evaluated</em> as soon as possible after its associated creation form, as determined by data flow. If the initialization form for an <span><i>object</i></span> does not reference any other <span><i>objects</i></span> not referenced earlier in the <span><i>file</i></span> and processed by the <span><i>file compiler</i></span> using <span><b>make-load-form</b></span>, the initialization form is evaluated immediately after the creation form. If a creation or initialization form <em>F</em> does contain references to such <span><i>objects</i></span>, the creation forms for those other objects are evaluated before <em>F</em>, and the initialization forms for those other <span><i>objects</i></span> are also evaluated before <em>F</em> whenever they do not depend on the <span><i>object</i></span> created or initialized by <em>F</em>. Where these rules do not uniquely determine an order of <span><i>evaluation</i></span> between two creation/initialization forms, the order of <span><i>evaluation</i></span> is unspecified.</p>
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<p>While these creation and initialization forms are being evaluated, the <span><i>objects</i></span> are possibly in an uninitialized state, analogous to the state of an <span><i>object</i></span> between the time it has been created by <span><b>allocate-instance</b></span> and it has been processed fully by <span><b>initialize-instance</b></span>. Programmers writing</p>
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<p><span><i>methods</i></span> for <span><b>make-load-form</b></span> must take care in manipulating <span><i>objects</i></span> not to depend on <span><i>slots</i></span> that have not yet been initialized.</p>
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<p>It is <span><i>implementation-dependent</i></span> whether <span><b>load</b></span> calls <span><b>eval</b></span> on the <span><i>forms</i></span> or does some other operation that has an equivalent effect. For example, the <span><i>forms</i></span> might be translated into different but equivalent <span><i>forms</i></span> and then evaluated, they might be compiled and the resulting functions called by <span><b>load</b></span>, or they might be interpreted by a special-purpose function different from <span><b>eval</b></span>. All that is required is that the effect be equivalent to evaluating the <span><i>forms</i></span>.</p>
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<p>The <em>method specialized</em> on <span><b>class</b></span> returns a creation <span><i>form</i></span> using the <span><i>name</i></span> of the <span><i>class</i></span> if the <span><i>class</i></span> has a <span><i>proper name</i></span> in <span><i>environment</i></span>, signaling an error of <span><i>type</i></span> <span><b>error</b></span> if it does not have a <span><i>proper name</i></span>. <span><i>Evaluation</i></span> of the creation <span><i>form</i></span> uses the <span><i>name</i></span> to find the <span><i>class</i></span> with that <span><i>name</i></span>, as if by</p>
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<span><b>make-load-form</b></span>
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<p><em>calling</em> <span><b>find-class</b></span>. If a <span><i>class</i></span> with that <span><i>name</i></span> has not been defined, then a <span><i>class</i></span> may be computed in an <span><i>implementation-defined</i></span> manner. If a <span><i>class</i></span> cannot be returned as the result of <em>evaluating</em> the creation <span><i>form</i></span>, then an error of <span><i>type</i></span> <span><b>error</b></span> is signaled.</p>
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<p>Both <span><i>conforming implementations</i></span> and <span><i>conforming programs</i></span> may further <span><i>specialize</i></span> <span><b>make-load-form</b></span>.</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 punctuation" style="color:#393A34">(</span><span class="token car">defclass</span><span class="token plain"> obj </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 punctuation" style="color:#393A34">(</span><span class="token car">x</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">:x</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> obj-x</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">y</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">:y</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> obj-y</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">dist</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:accessor</span><span class="token plain"> obj-dist</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">→ #<STANDARD-CLASS OBJ 250020030> </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">defmethod</span><span class="token plain"> shared-initialize </span><span class="token lisp-property property" style="color:#36acaa">:after</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 car">self</span><span class="token plain"> obj</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> slot-names &rest keys</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 declare keyword" style="color:#00009f">declare</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">ignore</span><span class="token plain"> slot-names keys</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 keyword" style="color:#00009f">unless</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">slot-boundp</span><span class="token plain"> self ’dist</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">setf</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">obj-dist</span><span class="token plain"> self</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">sqrt</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">+</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">expt</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">obj-x</span><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</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 car">expt</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">obj-y</span><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">2</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 punctuation" style="color:#393A34">)</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">→ #<STANDARD-METHOD SHARED-INITIALIZE </span><span class="token punctuation" style="color:#393A34">(</span><span class="token lisp-property property" style="color:#36acaa">:AFTER</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 car">OBJ</span><span class="token plain"> T</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> 26266714> </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">defmethod</span><span class="token plain"> make-load-form </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">self</span><span class="token plain"> obj</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> &optional environment</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 declare keyword" style="color:#00009f">declare</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">ignore</span><span class="token plain"> environment</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 comment" style="color:#999988;font-style:italic">;; Note that this definition only works because X and Y do not </span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">;; contain information which refers back to the object itself. </span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">;; For a more general solution to this problem, see revised example below. </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">make-instance</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">,(</span><span class="token car">class-of</span><span class="token plain"> self</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 lisp-property property" style="color:#36acaa">:x</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">,(</span><span class="token car">obj-x</span><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:y</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">,(</span><span class="token car">obj-y</span><span class="token plain"> self</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">→ #<STANDARD-METHOD MAKE-LOAD-FORM </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">OBJ</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> 26267532> </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 keyword" style="color:#00009f">setq</span><span class="token plain"> obj1 </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">make-instance</span><span class="token plain"> ’obj </span><span class="token lisp-property property" style="color:#36acaa">:x</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3.0</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:y</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4.0</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → #<OBJ 26274136> </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">obj-dist</span><span class="token plain"> obj1</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> → </span><span class="token number" style="color:#36acaa">5.0</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">make-load-form</span><span class="token plain"> obj1</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 car">MAKE-INSTANCE</span><span class="token plain"> ’OBJ </span><span class="token lisp-property property" style="color:#36acaa">:X</span><span class="token plain"> ’3.0 </span><span class="token lisp-property property" style="color:#36acaa">:Y</span><span class="token plain"> ’4.0</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">In the above example, an equivalent *instance* of obj is reconstructed by using the values of two of its *slots*. The value of the third *slot* is derived from those two values. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Another way to write the **make-load-form** *method* in that example is to use **make-load-form-saving-slots**. The code it generates might yield a slightly different result from the **make-load-form** *method* shown above, but the operational effect will be the same. For example: </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">;; Redefine method defined above. </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">defmethod</span><span class="token plain"> make-load-form </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">self</span><span class="token plain"> obj</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> &optional environment</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">make-load-form-saving-slots</span><span class="token plain"> self </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:slot-names</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">x</span><span class="token plain"> y</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 lisp-property property" style="color:#36acaa">:environment</span><span class="token plain"> environment</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">→ #<STANDARD-METHOD MAKE-LOAD-FORM </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">OBJ</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> 42755655> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">**make-load-form** </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">;; Try MAKE-LOAD-FORM on object created above. </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">make-load-form</span><span class="token plain"> obj1</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">ALLOCATE-INSTANCE</span><span class="token plain"> ’#<STANDARD-CLASS OBJ 250020030></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">PROGN</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">SETF</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">SLOT-VALUE</span><span class="token plain"> ’#<OBJ 26274136> ’X</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> ’3.0</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">SETF</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">SLOT-VALUE</span><span class="token plain"> ’#<OBJ 26274136> ’Y</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> ’4.0</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">INITIALIZE-INSTANCE</span><span class="token plain"> ’#<OBJ 26274136></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">In the following example, *instances* of my-frob are “interned” in some way. An equivalent *instance* is reconstructed by using the value of the name slot as a key for searching existing *objects*. In this case the programmer has chosen to create a new *object* if no existing *object* is found</span><span class="token comment" style="color:#999988;font-style:italic">; alternatively an error could have been signaled in that case. </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">defclass</span><span class="token plain"> my-frob </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 punctuation" style="color:#393A34">(</span><span class="token car">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">:name</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:reader</span><span class="token plain"> my-name</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"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">defmethod</span><span class="token plain"> make-load-form </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">self</span><span class="token plain"> my-frob</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> &optional environment</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 declare keyword" style="color:#00009f">declare</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">ignore</span><span class="token plain"> environment</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 car">find-my-frob</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">,(</span><span class="token car">my-name</span><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:if-does-not-exist</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:create</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">In the following example, the data structure to be dumped is circular, because each parent has a list of its children and each child has a reference back to its parent. If **make-load-form** is called on one *object* in such a structure, the creation form creates an equivalent *object* and fills in the children slot, which forces creation of equivalent *objects* for all of its children, grandchildren, etc. </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">At this point none of the parent *slots* have been filled in. The initialization form fills in the parent *slot*, which forces creation of an equivalent *object* for the parent if it was not already created. Thus the entire tree is recreated at **load** time. At compile time, **make-load-form** is called once for each *object* in the tree. All of the creation forms are evaluated, in *implementation-dependent* order, and then all of the initialization forms are evaluated, also in *implementation-dependent* order. </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">defclass</span><span class="token plain"> tree-with-parent </span><span class="token punctuation" style="color:#393A34">(</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 car">parent</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:accessor</span><span class="token plain"> tree-parent</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">children</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">:children</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"></span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">defmethod</span><span class="token plain"> make-load-form </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">x</span><span class="token plain"> tree-with-parent</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> &optional environment</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 declare keyword" style="color:#00009f">declare</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">ignore</span><span class="token plain"> environment</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 car">values</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">;; creation form </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">make-instance</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">,(</span><span class="token car">class-of</span><span class="token plain"> x</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token lisp-property property" style="color:#36acaa">:children</span><span class="token plain"> ’</span><span class="token punctuation" style="color:#393A34">,(</span><span class="token car">slot-value</span><span class="token plain"> x ’children</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 comment" style="color:#999988;font-style:italic">;; initialization form </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">setf</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">tree-parent</span><span class="token plain"> ’</span><span class="token splice symbol variable" style="color:#36acaa">,x</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 car">slot-value</span><span class="token plain"> x ’parent</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">In the following example, the data structure to be dumped has no special properties and an equivalent structure can be reconstructed simply by reconstructing the *slots*’ contents. </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">defstruct</span><span class="token plain"> my-struct a b c</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">defmethod</span><span class="token plain"> make-load-form </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token car">s</span><span class="token plain"> my-struct</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> &optional environment</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">make-load-form-saving-slots</span><span class="token plain"> s </span><span class="token lisp-property property" style="color:#36acaa">:environment</span><span class="token plain"> environment</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" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></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" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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<p><strong>Exceptional Situations:</strong></p>
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<p>The <em>methods specialized</em> on <span><b>standard-object</b></span>, <span><b>structure-object</b></span>, and <span><b>condition</b></span> all signal an error of <span><i>type</i></span> <span><b>error</b></span>.</p>
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<p>It is <span><i>implementation-dependent</i></span> whether <em>calling</em> <span><b>make-load-form</b></span> on a <span><i>generalized instance</i></span> of a <span><i>system class</i></span> signals an error or returns creation and initialization <span><i>forms</i></span>.</p>
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<p><strong>See Also:</strong></p>
|
||
<p><span><b>compile-file</b></span>, <span><b>make-load-form-saving-slots</b></span>, Section 3.2.4.4 (Additional Constraints on Externaliz able Objects) Section 3.1 (Evaluation), Section 3.2 (Compilation)</p>
|
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<p><strong>Notes:</strong></p>
|
||
<p>The <span><i>file compiler</i></span> calls <span><b>make-load-form</b></span> in specific circumstances detailed in Section 3.2.4.4 (Additional Constraints on Externalizable Objects).</p>
|
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<p>Some <span><i>implementations</i></span> may provide facilities for defining new <em>subclasses</em> of <em>classes</em> which are specified as <em>system classes</em>. (Some likely candidates include <span><b>generic-function</b></span>, <span><b>method</b></span>, and <span><b>stream</b></span>). Such <span><i>implementations</i></span> should document how the <span><i>file compiler</i></span> processes <span><i>instances</i></span> of such <em>classes</em> when encountered as <em>literal objects</em>, and should document any relevant <span><i>methods</i></span> for <span><b>make-load-form</b></span>.</p>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="expanded-reference-make-load-form">Expanded Reference: make-load-form<a href="make-load-form_standard-generic-function.html#expanded-reference-make-load-form" class="hash-link" aria-label="Direct link to Expanded Reference: make-load-form" title="Direct link to Expanded Reference: make-load-form"></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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