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60 lines
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<TITLE>CLHS: Accessor FDEFINITION</TITLE>
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<A NAME="fdefinition"><I>Accessor</I> <B>FDEFINITION</B></A> <P>
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<P>
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<P><B>Syntax:</B><P>
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<P>
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<B>fdefinition</B> <I>function-name</I> => <I>definition</I><P>
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<TT>(setf (</TT><B>fdefinition</B> <I>function-name</I><TT>) </TT><I>new-definition</I><TT>)</TT><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>function-name</I>---a <A REL=DEFINITION HREF="26_glo_f.htm#function_name"><I>function name</I></A>. In the non-<A REL=DEFINITION HREF="m_setf_.htm#setf"><B>setf</B></A> case, the <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> must be <A REL=DEFINITION HREF="26_glo_f.htm#fbound"><I>fbound</I></A> in the <A REL=DEFINITION HREF="26_glo_g.htm#global_environment"><I>global environment</I></A>. <P>
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<I>definition</I>---Current global function definition named by <I>function-name</I>. <P>
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<I>new-definition</I>---a <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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<A REL=DEFINITION HREF="#fdefinition"><B>fdefinition</B></A> <A REL=DEFINITION HREF="26_glo_a.htm#access"><I>accesses</I></A> the current global function definition named by <I>function-name</I>. The definition may be a <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> or may be an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> representing a <A REL=DEFINITION HREF="26_glo_s.htm#special_form"><I>special form</I></A> or <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A>. The value returned by <A REL=DEFINITION HREF="#fdefinition"><B>fdefinition</B></A> when <A REL=DEFINITION HREF="f_fbound.htm#fboundp"><B>fboundp</B></A> returns true but the <I>function-name</I> denotes a <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A> or <A REL=DEFINITION HREF="26_glo_s.htm#special_form"><I>special form</I></A> is not well-defined, but <A REL=DEFINITION HREF="#fdefinition"><B>fdefinition</B></A> does not signal an error. <P>
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<P><B>Examples:</B> None.
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<P>
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<P><B>Side Effects:</B> None.
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<P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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Should signal an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A> if <I>function-name</I> is not a <A REL=DEFINITION HREF="26_glo_f.htm#function_name"><I>function name</I></A>. <P>
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An error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_undefi.htm#undefined-function"><B>undefined-function</B></A> is signaled in the non-<A REL=DEFINITION HREF="m_setf_.htm#setf"><B>setf</B></A> case if <I>function-name</I> is not <A REL=DEFINITION HREF="26_glo_f.htm#fbound"><I>fbound</I></A>. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_fbound.htm#fboundp"><B>fboundp</B></A>, <A REL=DEFINITION HREF="f_fmakun.htm#fmakunbound"><B>fmakunbound</B></A>, <A REL=DEFINITION HREF="f_macro_.htm#macro-function"><B>macro-function</B></A>, <A REL=DEFINITION HREF="f_specia.htm#special-operator-p"><B>special-operator-p</B></A>, <A REL=DEFINITION HREF="f_symb_1.htm#symbol-function"><B>symbol-function</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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<A REL=DEFINITION HREF="#fdefinition"><B>fdefinition</B></A> cannot <A REL=DEFINITION HREF="26_glo_a.htm#access"><I>access</I></A> the value of a lexical function name produced by <A REL=DEFINITION HREF="s_flet_.htm#flet"><B>flet</B></A> or <A REL=DEFINITION HREF="s_flet_.htm#labels"><B>labels</B></A>; it can <A REL=DEFINITION HREF="26_glo_a.htm#access"><I>access</I></A> only the global function value. <P>
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<A REL=DEFINITION HREF="m_setf_.htm#setf"><B>setf</B></A> can be used with <A REL=DEFINITION HREF="#fdefinition"><B>fdefinition</B></A> to replace a global function definition when the <I>function-name</I>'s function definition does not represent a <A REL=DEFINITION HREF="26_glo_s.htm#special_form"><I>special form</I></A>. <A REL=DEFINITION HREF="m_setf_.htm#setf"><B>setf</B></A> of <A REL=DEFINITION HREF="#fdefinition"><B>fdefinition</B></A> requires a <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> as the new value. It is an error to set the <A REL=DEFINITION HREF="#fdefinition"><B>fdefinition</B></A> of a <I>function-name</I> to a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>, a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A>, or the value returned by <A REL=DEFINITION HREF="#fdefinition"><B>fdefinition</B></A> on the name of a <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A> or <A REL=DEFINITION HREF="26_glo_s.htm#special_form"><I>special form</I></A>. <P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issues</A>, <I>not part of the specification</I>, apply to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss321.htm">SPECIAL-FORM-P-MISNOMER:RENAME</A><LI> <A REL=CHILD HREF="../Issues/iss179.htm">FUNCTION-TYPE:X3J13-MARCH-88</A><LI> <A REL=CHILD HREF="../Issues/iss174.htm">FUNCTION-NAME:LARGE</A><P></UL><HR>
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