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33 lines
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<TITLE>CLHS: Section 6.1.1.5.5</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="06_aaed.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="06_aae.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="06_aaef.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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6.1.1.5.5 Summary of Conditional Execution Clauses</H2> <P>
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The <TT>if</TT> and <TT>when</TT> constructs take one <A REL=DEFINITION HREF="26_glo_f.htm#form"><I>form</I></A> as a test and a clause that is executed when the test <A REL=DEFINITION HREF="26_glo_y.htm#yield"><I>yields</I></A> <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A>. The clause can be a value accumulation, unconditional, or another conditional clause; it can also be any combination of such clauses connected by the <A REL=DEFINITION HREF="m_loop.htm#loop"><B>loop</B></A> <TT>and</TT> keyword. <P>
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The <A REL=DEFINITION HREF="m_loop.htm#loop"><B>loop</B></A> <TT>unless</TT> construct is similar to the <A REL=DEFINITION HREF="m_loop.htm#loop"><B>loop</B></A> <TT>when</TT> construct except that it complements the test result. <P>
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The <A REL=DEFINITION HREF="m_loop.htm#loop"><B>loop</B></A> <TT>else</TT> construct provides an optional component of <TT>if</TT>, <TT>when</TT>, and <TT>unless</TT> clauses that is executed when an <TT>if</TT> or <TT>when</TT> test <A REL=DEFINITION HREF="26_glo_y.htm#yield"><I>yields</I></A> <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A> or when an <TT>unless</TT> test <A REL=DEFINITION HREF="26_glo_y.htm#yield"><I>yields</I></A> <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A>. The component is one of the clauses described under <TT>if</TT>. <P>
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The <A REL=DEFINITION HREF="m_loop.htm#loop"><B>loop</B></A> <TT>end</TT> construct provides an optional component to mark the end of a conditional clause. <P>
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For more information, see <A REL=CHILD HREF="06_af.htm">Section 6.1.6 (Conditional Execution Clauses)</A>. <P>
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