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<!-- -->
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<!-- -->
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<p><strong>defmethod</strong> <span><i>Macro</i></span></p>
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<p><strong>Syntax:</strong></p>
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<p><span><b>defmethod</b></span> <em>function-name {method-qualifier}</em>* <em>specialized-lambda-list</em></p>
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<p>[[ <span><i>{declaration}</i></span>* <em>| documentation</em> ]] <span><i>{form}</i></span>*</p>
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<p>→ new-method</p>
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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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<span><b>defmethod</b></span>
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<p><em>method-qualifier</em>::= <span><i>non-list</i></span></p>
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<p><em>specialized-lambda-list</em>::= (<em>{var |</em> (<em>var parameter-specializer-name</em>)<em>}</em>*</p>
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<p>[&optional <em>{var |</em> (var [<em>initform</em> [<em>supplied-p-parameter</em>] ])<em>}</em>*]</p>
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<p>[&rest <em>var</em>]</p>
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<p>[&key*{var |* (<em>{var |</em> (<em>keywordvar</em>)<em>}</em> [<em>initform</em> [<em>supplied-p-parameter</em>] ])<em>}</em>*</p>
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<p>[<strong>&allow-other-keys</strong>] ]</p>
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<p>[&aux <em>{var |</em> (<em>var</em> [<em>initform</em>] )<em>}</em>*] )</p>
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<p><em>parameter-specializer-name</em>::= <em>symbol |</em> (eql <em>eql-specializer-form</em>)</p>
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<p><strong>Arguments and Values:</strong></p>
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<p><span><i>declaration</i></span>—a <span><b>declare</b></span> <span><i>expression</i></span>; not evaluated.</p>
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<p><em>documentation</em>—a <span><i>string</i></span>; not evaluated.</p>
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<p><em>var</em>—a <em>variable name</em>.</p>
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<p><em>eql-specializer-form</em>—a <span><i>form</i></span>.</p>
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<p><span><i>Form</i></span>—a <span><i>form</i></span>.</p>
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<p><em>Initform</em>—a <span><i>form</i></span>.</p>
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<p><em>Supplied-p-parameter</em>—variable name.</p>
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<p><em>new-method</em>—the new <em>method object</em>.</p>
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<p><strong>Description:</strong></p>
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<p>The macro <span><b>defmethod</b></span> defines a <span><i>method</i></span> on a <em>generic function</em>.</p>
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<p>If (fboundp <em>function-name</em>) is <span><b>nil</b></span>, a <em>generic function</em> is created with default values for the argument precedence order (each argument is more specific than the arguments to its right in the argument list), for the generic function class (the <span><i>class</i></span> <span><b>standard-generic-function</b></span>), for the method class (the <span><i>class</i></span> <span><b>standard-method</b></span>), and for the method combination type (the standard method combination</p>
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<p>type). The <em>lambda list</em> of the <em>generic function</em> is congruent with the <em>lambda list</em> of the <span><i>method</i></span> being defined; if the <span><b>defmethod</b></span> form mentions keyword arguments, the <em>lambda list</em> of the <em>generic function</em> will mention &key (but no keyword arguments). If <em>function-name</em> names an <em>ordinary function</em>, a <span><i>macro</i></span>, or a <em>special operator</em> , an error is signaled.</p>
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<p>If a <em>generic function</em> is currently named by <em>function-name</em>, the <em>lambda list</em> of the <span><i>method</i></span> must be congruent with the <em>lambda list</em> of the <em>generic function</em>. If this condition does not hold, an error is signaled. For a definition of congruence in this context, see Section 7.6.4 (Congruent Lambda-lists for all Methods of a Generic Function).</p>
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<p>Each <em>method-qualifier</em> argument is an <span><i>object</i></span> that is used by method combination to identify the given <span><i>method</i></span>. The method combination type might further restrict what a method <span><i>qualifier</i></span> can be. The standard method combination type allows for <em>unqualified methods</em> and <span><i>methods</i></span> whose sole</p>
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<span><b>defmethod</b></span>
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<p><span><i>qualifier</i></span> is one of the keywords <!-- -->:before<!-- -->, <!-- -->:after<!-- -->, or <!-- -->:around<!-- -->.</p>
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<p>The <em>specialized-lambda-list</em> argument is like an ordinary <em>lambda list</em> except that the <span><i>names</i></span> of required parameters can be replaced by specialized parameters. A specialized parameter is a list of the form (<em>var parameter-specializer-name</em>). Only required parameters can be specialized. If <em>parameter-specializer-name</em> is a <span><i>symbol</i></span> it names a <span><i>class</i></span>; if it is a <span><i>list</i></span>, it is of the form (eql <em>eql-specializer-form</em>). The parameter specializer name (eql <em>eql-specializer-form</em>) indicates that the corresponding argument must be <span><b>eql</b></span> to the <span><i>object</i></span> that is the value of <em>eql-specializer-form</em> for the <span><i>method</i></span> to be applicable. The <em>eql-specializer-form</em> is evaluated at the time that the expansion of the <span><b>defmethod</b></span> macro is evaluated. If no <em>parameter specializer name</em> is specified for a given required parameter, the <em>parameter specializer</em> defaults to the <span><i>class</i></span> <span><b>t</b></span>. For further discussion, see Section 7.6.2 (Introduction to Methods).</p>
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<p>The <span><i>form</i></span> arguments specify the method body. The body of the <span><i>method</i></span> is enclosed in an <em>implicit block</em>. If <em>function-name</em> is a <span><i>symbol</i></span>, this block bears the same <span><i>name</i></span> as the <em>generic function</em>. If <em>function-name</em> is a <span><i>list</i></span> of the form (setf <span><i>symbol</i></span>), the <span><i>name</i></span> of the block is <span><i>symbol</i></span>.</p>
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<p>The <span><i>class</i></span> of the <em>method object</em> that is created is that given by the method class option of the <span><i>generic function</i></span> on which the <span><i>method</i></span> is defined.</p>
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<p>If the <span><i>generic function</i></span> already has a <span><i>method</i></span> that agrees with the <span><i>method</i></span> being defined on <span><i>parameter specializers</i></span> and <span><i>qualifiers</i></span>, <span><b>defmethod</b></span> replaces the existing <span><i>method</i></span> with the one now being defined. For a definition of agreement in this context. see Section 7.6.3 (Agreement on Parameter Specializers and Qualifiers).</p>
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<p>The <span><i>parameter specializers</i></span> are derived from the <span><i>parameter specializer names</i></span> as described in Section 7.6.2 (Introduction to Methods).</p>
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<p>The expansion of the <span><b>defmethod</b></span> macro “refers to” each specialized parameter (see the description of <span><b>ignore</b></span> within the description of <span><b>declare</b></span>). This includes parameters that have an explicit <span><i>parameter specializer name</i></span> of <span><b>t</b></span>. This means that a compiler warning does not occur if the body of the <span><i>method</i></span> does not refer to a specialized parameter, while a warning might occur if the body of the <span><i>method</i></span> does not refer to an unspecialized parameter. For this reason, a parameter that specializes on <span><b>t</b></span> is not quite synonymous with an unspecialized parameter in this context.</p>
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<p>Declarations at the head of the method body that apply to the method’s <span><i>lambda variables</i></span> are treated as <span><i>bound declarations</i></span> whose <span><i>scope</i></span> is the same as the corresponding <span><i>bindings</i></span>.</p>
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<p>Declarations at the head of the method body that apply to the functional bindings of <span><b>call-next-method</b></span> or <span><b>next-method-p</b></span> apply to references to those functions within the method body <span><i>forms</i></span>. Any outer <span><i>bindings</i></span> of the <span><i>function names</i></span> <span><b>call-next-method</b></span> and <span><b>next-method-p</b></span>, and declarations associated with such <span><i>bindings</i></span> are <em>shadowed</em> <sub>2</sub> within the method body <span><i>forms</i></span>.</p>
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<p>The <span><i>scope</i></span> of <span><i>free declarations</i></span> at the head of the method body is the entire method body, which includes any implicit local function definitions but excludes <span><i>initialization forms</i></span> for the <span><i>lambda variables</i></span>.</p>
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<p><span><b>defmethod</b></span> is not required to perform any compile-time side effects. In particular, the <span><i>methods</i></span></p>
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<p>are not installed for invocation during compilation. An <span><i>implementation</i></span> may choose to store information about the <span><i>generic function</i></span> for the purposes of compile-time error-checking (such as checking the number of arguments on calls, or noting that a definition for the function name has been seen).</p>
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<p><em>Documentation</em> is attached as a <span><i>documentation string</i></span> to the <em>method object</em>.</p>
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<p><strong>Affected By:</strong></p>
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<p>The definition of the referenced <span><i>generic function</i></span>.</p>
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<p><strong>Exceptional Situations:</strong></p>
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<p>If <em>function-name</em> names an <span><i>ordinary function</i></span>, a <span><i>macro</i></span>, or a <span><i>special operator</i></span> , an error of <span><i>type</i></span> <span><b>error</b></span> is signaled.</p>
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<p>If a <span><i>generic function</i></span> is currently named by <em>function-name</em>, the <span><i>lambda list</i></span> of the <span><i>method</i></span> must be congruent with the <span><i>lambda list</i></span> of the <span><i>generic function</i></span>, or an error of <span><i>type</i></span> <span><b>error</b></span> is signaled.</p>
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<p><strong>See Also:</strong></p>
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<p><span><b>defgeneric</b></span>, <strong>documentation</strong>, Section 7.6.2 (Introduction to Methods), Section 7.6.4 (Congruent Lambda-lists for all Methods of a Generic Function), Section 7.6.3 (Agreement on Parameter Specializers and Qualifiers), Section 3.4.11 (Syntactic Interaction of Documentation Strings and Declarations)</p>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="expanded-reference-defmethod">Expanded Reference: defmethod<a href="defmethod_macro.html#expanded-reference-defmethod" class="hash-link" aria-label="Direct link to Expanded Reference: defmethod" title="Direct link to Expanded Reference: defmethod"></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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