46 lines
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46 lines
3.8 KiB
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<TITLE>CLHS: Section 22.3.9.3</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="22_cib.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="22_ci.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="22_cj.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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22.3.9.3 Tilde Newline: Ignored Newline</H2> <P>
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<A REL=DEFINITION HREF="26_glo_t.htm#tilde"><I>Tilde</I></A> immediately followed by a <A REL=DEFINITION HREF="26_glo_n.htm#newline"><I>newline</I></A> ignores the <A REL=DEFINITION HREF="26_glo_n.htm#newline"><I>newline</I></A> and any following non-newline <A REL=DEFINITION HREF="26_glo_w.htm#whitespace"><I>whitespace</I></A>[1] characters. With a <TT>:</TT>, the <A REL=DEFINITION HREF="26_glo_n.htm#newline"><I>newline</I></A> is ignored, but any following <A REL=DEFINITION HREF="26_glo_w.htm#whitespace"><I>whitespace</I></A>[1] is left in place. With an <TT>@</TT>, the <A REL=DEFINITION HREF="26_glo_n.htm#newline"><I>newline</I></A> is left in place, but any following <A REL=DEFINITION HREF="26_glo_w.htm#whitespace"><I>whitespace</I></A>[1] is ignored. For example: <P>
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<PRE>
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(defun type-clash-error (fn nargs argnum right-type wrong-type)
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(format *error-output*
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"~&~S requires its ~:[~:R~;~*~]~
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argument to be of type ~S,~%but it was called ~
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with an argument of type ~S.~%"
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fn (eql nargs 1) argnum right-type wrong-type))
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(type-clash-error 'aref nil 2 'integer 'vector) prints:
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AREF requires its second argument to be of type INTEGER,
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but it was called with an argument of type VECTOR.
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NIL
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(type-clash-error 'car 1 1 'list 'short-float) prints:
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CAR requires its argument to be of type LIST,
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but it was called with an argument of type SHORT-FLOAT.
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NIL
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</PRE>
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</TT> Note that in this example newlines appear in the output only as specified by the <TT>~&</TT> and <TT>~%</TT> directives; the actual newline characters in the control string are suppressed because each is preceded by a tilde. <P>
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