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75 lines
4.2 KiB
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<!-- 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 TYPE-ERROR-DATUM, TYPE-ERROR-EXPECTED-TYPE</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="e_tp_err.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="c_types_.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="e_smp_tp.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<A NAME="type-error-datum"><A NAME="type-error-expected-type"><I>Function</I> <B>TYPE-ERROR-DATUM, TYPE-ERROR-EXPECTED-TYPE</B></A></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>type-error-datum</B> <I>condition</I> => <I>datum</I><P>
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<B>type-error-expected-type</B> <I>condition</I> => <I>expected-type</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>condition</I>---a <A REL=DEFINITION HREF="26_glo_c.htm#condition"><I>condition</I></A> 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>. <P>
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<I>datum</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A>. <P>
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<I>expected-type</I>---a <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</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="#type-error-datum"><B>type-error-datum</B></A> returns the offending datum in the <A REL=DEFINITION HREF="26_glo_s.htm#situation"><I>situation</I></A> represented by the <I>condition</I>. <P>
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<A REL=DEFINITION HREF="#type-error-expected-type"><B>type-error-expected-type</B></A> returns the expected type of the offending datum in the <A REL=DEFINITION HREF="26_glo_s.htm#situation"><I>situation</I></A> represented by the <I>condition</I>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(defun fix-digits (condition)
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(check-type condition type-error)
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(let* ((digits '(zero one two three four
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five six seven eight nine))
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(val (position (type-error-datum condition) digits)))
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(if (and val (subtypep 'fixnum (type-error-expected-type condition)))
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(store-value 7))))
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(defun foo (x)
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(handler-bind ((type-error #'fix-digits))
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(check-type x number)
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(+ x 3)))
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(foo 'seven)
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=> 10
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</PRE>
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</TT> <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> None.
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<P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A>, <A REL=CHILD HREF="09_.htm">Section 9 (Conditions)</A> <P>
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<P><B>Notes:</B> None.
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<P>
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<HR>
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