72 lines
5.2 KiB
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72 lines
5.2 KiB
HTML
<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Function FUNCALL</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="s_flet_.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="c_data_a.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="s_fn.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<A NAME="funcall"><I>Function</I> <B>FUNCALL</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>funcall</B> <I>function <TT>&rest</TT> args</I> => <I><I>result</I><B>*</B></I><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</I>---a <A REL=DEFINITION HREF="26_glo_f.htm#function_designator"><I>function designator</I></A>. <P>
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<I>args</I>---<A REL=DEFINITION HREF="26_glo_a.htm#argument"><I>arguments</I></A> to the <I>function</I>. <P>
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<I>results</I>---the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>values</I></A> returned by the <I>function</I>. <P>
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<P><B>Description:</B><P>
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<P>
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<A REL=DEFINITION HREF="#funcall"><B>funcall</B></A> applies <I>function</I> to <I>args</I>. If <I>function</I> is a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>, it is coerced to a <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> as if by finding its <A REL=DEFINITION HREF="26_glo_f.htm#functional_value"><I>functional value</I></A> in the <A REL=DEFINITION HREF="26_glo_g.htm#global_environment"><I>global environment</I></A>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(funcall #'+ 1 2 3) => 6
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(funcall 'car '(1 2 3)) => 1
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(funcall 'position 1 '(1 2 3 2 1) :start 1) => 4
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(cons 1 2) => (1 . 2)
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(flet ((cons (x y) `(kons ,x ,y)))
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(let ((cons (symbol-function '+)))
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(funcall #'cons
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(funcall 'cons 1 2)
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(funcall cons 1 2))))
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=> (KONS (1 . 2) 3)
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</PRE>
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</TT> <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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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> should be signaled if <I>function</I> is a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> that does not have a global definition as a <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> or that has a global definition as a <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A> or a <A REL=DEFINITION HREF="26_glo_s.htm#special_operator"><I>special operator</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_apply.htm#apply"><B>apply</B></A>, <A REL=DEFINITION HREF="s_fn.htm#function"><B>function</B></A>, <A REL=CHILD HREF="03_a.htm">Section 3.1 (Evaluation)</A> <P>
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<P><B>Notes:</B><P>
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<P>
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<PRE>
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(funcall function arg1 arg2 ...)
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== (apply function arg1 arg2 ... nil)
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== (apply function (list arg1 arg2 ...))
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</PRE>
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</TT> <P>
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The difference between <A REL=DEFINITION HREF="#funcall"><B>funcall</B></A> and an ordinary function call is that in the former case the <I>function</I> is obtained by ordinary <A REL=DEFINITION HREF="26_glo_e.htm#evaluation"><I>evaluation</I></A> of a <A REL=DEFINITION HREF="26_glo_f.htm#form"><I>form</I></A>, and in the latter case it is obtained by the special interpretation of the function position that normally occurs. <P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issue</A>, <I>not part of the specification</I>, applies to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss179.htm">FUNCTION-TYPE:X3J13-MARCH-88</A><P></UL><HR>
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