54 lines
5.4 KiB
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54 lines
5.4 KiB
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<TITLE>CLHS: Local Macro PPRINT-EXIT-IF-LIST-EXHAUSTED</TITLE>
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<A NAME="pprint-exit-if-list-exhausted"><I>Local Macro</I> <B>PPRINT-EXIT-IF-LIST-EXHAUSTED</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>pprint-exit-if-list-exhausted</B> <I><I><no arguments></I></I> => <I><A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A></I><P>
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<P>
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<P><B>Arguments and Values:</B> None.
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<P>
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<P><B>Description:</B><P>
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<P>
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Tests whether or not the <I>list</I> passed to the <I>lexically current logical block</I> has been exhausted; see <A REL=CHILD HREF="22_baa.htm">Section 22.2.1.1 (Dynamic Control of the Arrangement of Output)</A>. If this <I>list</I> has been reduced to <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>, <A REL=DEFINITION HREF="#pprint-exit-if-list-exhausted"><B>pprint-exit-if-list-exhausted</B></A> terminates the execution of the <I>lexically current logical block</I> except for the printing of the suffix. Otherwise <A REL=DEFINITION HREF="#pprint-exit-if-list-exhausted"><B>pprint-exit-if-list-exhausted</B></A> returns <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. <P>
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Whether or not <A REL=DEFINITION HREF="#pprint-exit-if-list-exhausted"><B>pprint-exit-if-list-exhausted</B></A> is <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> is <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent"><I>implementation-dependent</I></A>; however, the restrictions on redefinition and <I>shadowing</I> of <A REL=DEFINITION HREF="#pprint-exit-if-list-exhausted"><B>pprint-exit-if-list-exhausted</B></A> are the same as for <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> in the <TT>COMMON-LISP</TT> package which are <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>. The consequences of attempting to use <A REL=DEFINITION HREF="#pprint-exit-if-list-exhausted"><B>pprint-exit-if-list-exhausted</B></A> outside of <A REL=DEFINITION HREF="m_ppr_lo.htm#pprint-logical-block"><B>pprint-logical-block</B></A> are undefined. <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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An error is signaled (at macro expansion time or at run time) if <A REL=DEFINITION HREF="#pprint-exit-if-list-exhausted"><B>pprint-exit-if-list-exhausted</B></A> is used anywhere other than lexically within a call on <A REL=DEFINITION HREF="m_ppr_lo.htm#pprint-logical-block"><B>pprint-logical-block</B></A>. Also, the consequences of executing <B>pprint-if-list-exhausted</B> outside of the dynamic extent of the <A REL=DEFINITION HREF="m_ppr_lo.htm#pprint-logical-block"><B>pprint-logical-block</B></A> which lexically contains it are undefined. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="m_ppr_lo.htm#pprint-logical-block"><B>pprint-logical-block</B></A>, <A REL=DEFINITION HREF="m_ppr_po.htm#pprint-pop"><B>pprint-pop</B></A>. <P>
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<P><B>Notes:</B> None.
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<P>
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<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/iss211.htm">LEXICAL-CONSTRUCT-GLOBAL-DEFINITION:UNDEFINED</A><LI> <A REL=CHILD HREF="../Issues/iss270.htm">PRETTY-PRINT-INTERFACE</A><P></UL><HR>
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