58 lines
4.5 KiB
HTML
58 lines
4.5 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: Variable *PRINT-ESCAPE*</TITLE>
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<A NAME="STprint-escapeST"><I>Variable</I> <B>*PRINT-ESCAPE*</B></A> <P>
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<P><B>Value Type:</B><P>
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<P>
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a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_boolean"><I>generalized boolean</I></A>. <P>
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<P><B>Initial Value:</B><P>
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<P>
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<A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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If <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>, escape characters and <A REL=DEFINITION HREF="26_glo_p.htm#package_prefix"><I>package prefixes</I></A> are not output when an expression is printed. <P>
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If <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A>, an attempt is made to print an <A REL=DEFINITION HREF="26_glo_e.htm#expression"><I>expression</I></A> in such a way that it can be read again to produce an <A REL=DEFINITION HREF="f_equal.htm#equal"><B>equal</B></A> <A REL=DEFINITION HREF="26_glo_e.htm#expression"><I>expression</I></A>. (This is only a guideline; not a requirement. See <A REL=DEFINITION HREF="v_pr_rda.htm#STprint-readablyST"><B>*print-readably*</B></A>.) <P>
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For more specific details of how the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STprint-escapeST"><B>*print-escape*</B></A> affects the printing of certain <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>types</I></A>, see <A REL=CHILD HREF="22_ac.htm">Section 22.1.3 (Default Print-Object Methods)</A>. <P>
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<P><B>Examples:</B><P>
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<PRE>
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(let ((*print-escape* t)) (write #\a))
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>> #\a
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=> #\a
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(let ((*print-escape* nil)) (write #\a))
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>> a
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=> #\a
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</PRE>
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</TT> <P>
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<P><B>Affected By:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_wr_pr.htm#princ"><B>princ</B></A>, <A REL=DEFINITION HREF="f_wr_pr.htm#prin1"><B>prin1</B></A>, <A REL=DEFINITION HREF="f_format.htm#format"><B>format</B></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_wr_pr.htm#write"><B>write</B></A>, <A REL=DEFINITION HREF="f_rdtabl.htm#readtable-case"><B>readtable-case</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="f_wr_pr.htm#princ"><B>princ</B></A> effectively binds <A REL=DEFINITION HREF="#STprint-escapeST"><B>*print-escape*</B></A> to <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>. <A REL=DEFINITION HREF="f_wr_pr.htm#prin1"><B>prin1</B></A> effectively binds <A REL=DEFINITION HREF="#STprint-escapeST"><B>*print-escape*</B></A> to <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A>. <P>
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