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<p><em>Generic Function</em> <strong>ADD-METHOD</strong></p>
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<p><strong>Syntax:</strong></p>
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<p><strong>add-method</strong> <em>generic-function</em> <em>method</em> => <em>generic-function</em></p>
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<p><strong>Arguments and values:</strong></p>
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<p><em>generic-function</em> -- A generic function metaobject.</p>
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<p><em>method</em> -- A method metaobject.</p>
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<p><strong>Description:</strong></p>
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<p>This generic function associates an unattached method with a generic function.</p>
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<p>An error is signaled if the lambda list of the method is not congruent with the lambda list of the generic function. An error is also signaled if the method is already associated with some other generic function.</p>
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<p>If the given method agrees with an existing method of the generic function on parameter specializers and qualifiers, the existing method is removed by calling<a href="https://lisp-docs.github.io/cl-language-reference/meta-object-protocol/remove-method"><strong>remove-method</strong></a> before the new method is added. See the section of the CLOS Specification called <a href="http://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node280.md#SECTION003216300000000000000" target="_blank" rel="noopener noreferrer">``Agreement on Parameter Specializers and Qualifiers''</a> for a definition of agreement in this context.</p>
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<p>Associating the method with the generic function then proceeds in four steps:</p>
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<ol>
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<li>add <em>method</em> to the set returned by <a href="https://lisp-docs.github.io/cl-language-reference/meta-object-protocol/generic-function-methods">generic-function-methods</a> arrange for <a href="https://lisp-docs.github.io/cl-language-reference/meta-object-protocol/method-generic-function">method-generic-function</a> to return <em>generic-function</em>;</li>
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<li>call <a href="https://lisp-docs.github.io/cl-language-reference/meta-object-protocol/add-direct-method">add-direct-method</a> for each of the method's specializers;</li>
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<li>call <a href="https://lisp-docs.github.io/cl-language-reference/meta-object-protocol/compute-discriminating-function">compute-discriminating-function</a> and install its result with <a href="https://lisp-docs.github.io/cl-language-reference/meta-object-protocol/set-funcallable-instance-function">set-funcallable-instance-function</a>; and</li>
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<li>update the dependents of the generic function.</li>
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</ol>
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<p>The generic function <strong>add-method</strong> can be called by the user or the implementation.</p>
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<p><strong>Methods:</strong></p>
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<hr>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="add-method-generic-function-standard-generic-function-method-standard-method"><a href="https://lisp-docs.github.io/cl-language-reference/meta-object-protocol/add-method-standard-generic-function-standard-method"><strong>add-method</strong> (<em>generic-function</em> standard-generic-function) (<em>method</em> standard-method)</a><a href="add-method.html#add-method-generic-function-standard-generic-function-method-standard-method" class="hash-link" aria-label="Direct link to add-method-generic-function-standard-generic-function-method-standard-method" title="Direct link to add-method-generic-function-standard-generic-function-method-standard-method"></a></h2></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/lisp-docs/cl-language-reference/tree/main/docs/meta-object-protocol/dictionary/add-method.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> by <b>daninus14</b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="add-method-standard-generic-function-standard-method.html"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">add-method-standard-generic-function-standard-method</div></a><a class="pagination-nav__link pagination-nav__link--next" href="all-no-methods.html"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Index of all functions excluding methods</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="add-method.html#add-method-generic-function-standard-generic-function-method-standard-method" class="table-of-contents__link toc-highlight"><strong>add-method</strong> (<em>generic-function</em> standard-generic-function) (<em>method</em> standard-method)</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Docs</div><ul class="footer__items clean-list"><li class="footer__item"><a href="../../../docs/tutorial.html" target="_blank" rel="noopener noreferrer" class="footer__link-item">Common Lisp Tutorial</a></li><li class="footer__item"><a href="../../index.html" target="_blank" rel="noopener noreferrer" class="footer__link-item">Common Lisp Technical Reference</a></li><li class="footer__item"><a href="../../../docs/help.html" target="_blank" rel="noopener noreferrer" class="footer__link-item">Help</a></li></ul></div><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/common-lisp" target="_blank" rel="noopener noreferrer" class="footer__link-item">Stack Overflow<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://discord.gg/hhk46CE" target="_blank" rel="noopener noreferrer" class="footer__link-item">Discord<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.0
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