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><DIV CLASS="matter"
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><SECTION
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><H2 ID="sec_17_2" CLASS="HeadII"
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>17.2 Rules about Test Functions</H2
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><UL CLASS="subtoc"
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><LI
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><A HREF="17_2_Rules_about_Test_Functions.html#sec_17_2_1"
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>17.2.1 Satisfying a Two-Argument Test</A
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></LI
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><LI
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><A HREF="17_2_Rules_about_Test_Functions.html#sec_17_2_1_1"
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>17.2.1.1 Examples of Satisfying a Two-Argument Test</A
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></LI
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><LI
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><A HREF="17_2_Rules_about_Test_Functions.html#sec_17_2_2"
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>17.2.2 Satisfying a One-Argument Test</A
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></LI
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><LI
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><A HREF="17_2_Rules_about_Test_Functions.html#sec_17_2_2_1"
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>17.2.2.1 Examples of Satisfying a One-Argument Test</A
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></LI
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></UL
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><H3 ID="sec_17_2_1" CLASS="HeadIII"
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>17.2.1 Satisfying a Two-Argument Test</H3
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><P CLASS="j"
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>When an <A HREF="26_1_Glossary.html#object"
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><EM CLASS="term"
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>object</EM
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></A
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> <I
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>O</I
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> is being considered iteratively against each <A HREF="26_1_Glossary.html#element"
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><EM CLASS="term"
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>element</EM
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></A
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> <I
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>E</I
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><SUB CLASS="sub"
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><I
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>i</I
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></SUB
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> of a <A HREF="26_1_Glossary.html#sequence"
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><EM CLASS="term"
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>sequence</EM
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></A
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> <I
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>S</I
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> by an <A HREF="26_1_Glossary.html#operator"
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><EM CLASS="term"
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>operator</EM
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></A
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> <I
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>F</I
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> listed in Figure 17–2, it is sometimes useful to control the way in which the presence of <I
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>O</I
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> is tested in <I
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>S</I
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> is tested by <I
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>F</I
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>. This control is offered on the basis of a <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> designated with either a <SPAN CLASS="kwd"
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><SPAN CLASS="cmtt"
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>:test</SPAN
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></SPAN
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> or <SPAN CLASS="kwd"
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><SPAN CLASS="cmtt"
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>:test-not</SPAN
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></SPAN
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> <A HREF="26_1_Glossary.html#argument"
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><EM CLASS="term"
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>argument</EM
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></A
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>.</P
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><DIV CLASS="displaythree"
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><FIGURE CLASS="boxfig"
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><DIV CLASS="figbody"
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><TABLE CELLSPACING="0" CELLPADDING="0" RULES="GROUPS" STYLE="margin: 1ex 0" WIDTH="100%"
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><TBODY
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
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><A HREF="f_adjoin.html" CLASS="misc"
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><B
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>adjoin</B
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
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> <A HREF="f_set-exclusive-or.html" CLASS="misc"
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><B
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>nset-exclusive-or</B
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
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> <A HREF="f_search.html" CLASS="misc"
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><B
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>search</B
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></A
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
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> <A HREF="f_assoc.html" CLASS="misc"
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><B
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>assoc</B
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
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> <A HREF="f_sublis.html" CLASS="misc"
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><B
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>nsublis</B
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
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> <A HREF="f_set-difference.html" CLASS="misc"
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><B
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>set-difference</B
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></A
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
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> <A HREF="f_count.html" CLASS="misc"
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><B
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>count</B
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
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> <A HREF="f_subst.html" CLASS="misc"
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><B
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>nsubst</B
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
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> <A HREF="f_set-exclusive-or.html" CLASS="misc"
|
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><B
|
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>set-exclusive-or</B
|
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></A
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
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> <A HREF="f_remove.html" CLASS="misc"
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><B
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>delete</B
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
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> <A HREF="f_substitute.html" CLASS="misc"
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><B
|
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>nsubstitute</B
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
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> <A HREF="f_sublis.html" CLASS="misc"
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><B
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>sublis</B
|
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></A
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
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> <A HREF="f_find.html" CLASS="misc"
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><B
|
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>find</B
|
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
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> <A HREF="f_union.html" CLASS="misc"
|
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><B
|
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>nunion</B
|
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></A
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
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> <A HREF="f_subsetp.html" CLASS="misc"
|
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><B
|
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>subsetp</B
|
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></A
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
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> <A HREF="f_intersection.html" CLASS="misc"
|
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><B
|
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>intersection</B
|
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></A
|
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
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> <A HREF="f_position.html" CLASS="misc"
|
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><B
|
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>position</B
|
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></A
|
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></TD
|
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
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> <A HREF="f_subst.html" CLASS="misc"
|
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><B
|
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>subst</B
|
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></A
|
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></TD
|
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
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> <SPAN CLASS="misc"
|
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><B
|
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>member</B
|
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></SPAN
|
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></TD
|
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
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> <A HREF="f_pushnew.html" CLASS="misc"
|
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><B
|
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>pushnew</B
|
|
></A
|
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></TD
|
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
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> <A HREF="f_substitute.html" CLASS="misc"
|
|
><B
|
|
>substitute</B
|
|
></A
|
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></TD
|
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></TR
|
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><TR
|
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
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> <A HREF="f_mismatch.html" CLASS="misc"
|
|
><B
|
|
>mismatch</B
|
|
></A
|
|
></TD
|
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
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> <A HREF="f_rassoc.html" CLASS="misc"
|
|
><B
|
|
>rassoc</B
|
|
></A
|
|
></TD
|
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_tree-equal.html" CLASS="misc"
|
|
><B
|
|
>tree-equal</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_intersection.html" CLASS="misc"
|
|
><B
|
|
>nintersection</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_remove.html" CLASS="misc"
|
|
><B
|
|
>remove</B
|
|
></A
|
|
></TD
|
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_union.html" CLASS="misc"
|
|
><B
|
|
>union</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_set-difference.html" CLASS="misc"
|
|
><B
|
|
>nset-difference</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_remove-duplicates.html" CLASS="misc"
|
|
><B
|
|
>remove-duplicates</B
|
|
></A
|
|
></TD
|
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><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
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><SPAN CLASS="misc"
|
|
></SPAN
|
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></TD
|
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></TR
|
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></TBODY
|
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></TABLE
|
|
></DIV
|
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><FIGCAPTION CLASS="caption"
|
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><B
|
|
>Figure 17–2. Operators that have Two-Argument Tests to be Satisfied</B
|
|
></FIGCAPTION
|
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></FIGURE
|
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></DIV
|
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><P CLASS="j"
|
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>The object <I
|
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>O</I
|
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> might not be compared directly to <I
|
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>E</I
|
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><SUB CLASS="sub"
|
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><I
|
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>i</I
|
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></SUB
|
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>. If a <SPAN CLASS="kwd"
|
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><SPAN CLASS="cmtt"
|
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>:key</SPAN
|
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></SPAN
|
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> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> is provided, it is a <A HREF="26_1_Glossary.html#designator"
|
|
><EM CLASS="term"
|
|
>designator</EM
|
|
></A
|
|
> for a <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>function</EM
|
|
></A
|
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> of one <A HREF="26_1_Glossary.html#argument"
|
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><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> to be called with each <I
|
|
>E</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> as an <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
>, and <A HREF="26_1_Glossary.html#yield"
|
|
><EM CLASS="term"
|
|
>yielding</EM
|
|
></A
|
|
> an <A HREF="26_1_Glossary.html#object"
|
|
><EM CLASS="term"
|
|
>object</EM
|
|
></A
|
|
> <I
|
|
>Z</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> to be used for comparison. (If there is no <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:key</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
>, <I
|
|
>Z</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> is <I
|
|
>E</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
>.) </P
|
|
><P CLASS="j"
|
|
>The <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>function</EM
|
|
></A
|
|
> designated by the <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:key</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> is never called on <I
|
|
>O</I
|
|
> itself. However, if the function operates on multiple sequences (<I CLASS="i"
|
|
><I
|
|
>e.g.</I
|
|
></I
|
|
>, as happens in <A HREF="f_set-difference.html" CLASS="funref"
|
|
><B
|
|
>set-difference</B
|
|
></A
|
|
>), <I
|
|
>O</I
|
|
> will be the result of calling the <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:key</SPAN
|
|
></SPAN
|
|
> function on an <A HREF="26_1_Glossary.html#element"
|
|
><EM CLASS="term"
|
|
>element</EM
|
|
></A
|
|
> of the other sequence. </P
|
|
><P CLASS="j"
|
|
>A <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
>, if supplied to <I
|
|
>F</I
|
|
>, is a <A HREF="26_1_Glossary.html#designator"
|
|
><EM CLASS="term"
|
|
>designator</EM
|
|
></A
|
|
> for a <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>function</EM
|
|
></A
|
|
> of two <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>arguments</EM
|
|
></A
|
|
>, <I
|
|
>O</I
|
|
> and <I
|
|
>Z</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
>. An <I
|
|
>E</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> is said (or, sometimes, an <I
|
|
>O</I
|
|
> and an <I
|
|
>E</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
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></SUB
|
|
> are said) to <DFN CLASS="newterm"
|
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><SPAN CLASS="cmbxsl"
|
|
>satisfy</SPAN
|
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> <SPAN CLASS="cmbxsl"
|
|
>the</SPAN
|
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> <SPAN CLASS="cmbxsl"
|
|
>test</SPAN
|
|
></DFN
|
|
> <SPAN CLASS="idx" DATA-KIND="idxterm" DATA-TERM="satisfy the test"
|
|
></SPAN
|
|
>if this <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>function</EM
|
|
></A
|
|
> returns a <A HREF="26_1_Glossary.html#generalized_boolean"
|
|
><EM CLASS="term"
|
|
>generalized boolean</EM
|
|
></A
|
|
> representing <A HREF="26_1_Glossary.html#true"
|
|
><EM CLASS="term"
|
|
>true</EM
|
|
></A
|
|
>. </P
|
|
><P CLASS="j"
|
|
>A <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test-not</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
>, if supplied to <I
|
|
>F</I
|
|
>, is <A HREF="26_1_Glossary.html#designator"
|
|
><EM CLASS="term"
|
|
>designator</EM
|
|
></A
|
|
> for a <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>function</EM
|
|
></A
|
|
> of two <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>arguments</EM
|
|
></A
|
|
>, <I
|
|
>O</I
|
|
> and <I
|
|
>Z</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
>. An <I
|
|
>E</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> is said (or, sometimes, an <I
|
|
>O</I
|
|
> and an <I
|
|
>E</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> are said) to <DFN CLASS="newterm"
|
|
><SPAN CLASS="cmbxsl"
|
|
>satisfy</SPAN
|
|
> <SPAN CLASS="cmbxsl"
|
|
>the</SPAN
|
|
> <SPAN CLASS="cmbxsl"
|
|
>test</SPAN
|
|
></DFN
|
|
> <SPAN CLASS="idx" DATA-KIND="idxterm" DATA-TERM="satisfy the test"
|
|
></SPAN
|
|
>if this <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test-not</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>function</EM
|
|
></A
|
|
> returns a <A HREF="26_1_Glossary.html#generalized_boolean"
|
|
><EM CLASS="term"
|
|
>generalized boolean</EM
|
|
></A
|
|
> representing <A HREF="26_1_Glossary.html#false"
|
|
><EM CLASS="term"
|
|
>false</EM
|
|
></A
|
|
>. </P
|
|
><P CLASS="j"
|
|
>If neither a <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test</SPAN
|
|
></SPAN
|
|
> nor a <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test-not</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> is supplied, it is as if a <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test</SPAN
|
|
></SPAN
|
|
> argument of <CODE CLASS="f"
|
|
>#'eql</CODE
|
|
> was supplied. </P
|
|
><P CLASS="j"
|
|
>The consequences are unspecified if both a <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test</SPAN
|
|
></SPAN
|
|
> and a <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test-not</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> are supplied in the same <A HREF="26_1_Glossary.html#call"
|
|
><EM CLASS="term"
|
|
>call</EM
|
|
></A
|
|
> to <I
|
|
>F</I
|
|
>.</P
|
|
><H4 ID="sec_17_2_1_1" CLASS="HeadIV"
|
|
>17.2.1.1 Examples of Satisfying a Two-Argument Test</H4
|
|
><PRE CLASS="screen"
|
|
> (remove "FOO" '(foo bar "FOO" "BAR" "foo" "bar") :test #'equal)
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (foo bar "BAR" "foo" "bar")
|
|
(remove "FOO" '(foo bar "FOO" "BAR" "foo" "bar") :test #'equalp)
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (foo bar "BAR" "bar")
|
|
(remove "FOO" '(foo bar "FOO" "BAR" "foo" "bar") :test #'string-equal)
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (bar "BAR" "bar")
|
|
(remove "FOO" '(foo bar "FOO" "BAR" "foo" "bar") :test #'string=)
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (BAR "BAR" "foo" "bar")
|
|
|
|
(remove 1 '(1 1.0 #C(1.0 0.0) 2 2.0 #C(2.0 0.0)) :test-not #'eql)
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (1)
|
|
(remove 1 '(1 1.0 #C(1.0 0.0) 2 2.0 #C(2.0 0.0)) :test-not #'=)
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (1 1.0 #C(1.0 0.0))
|
|
(remove 1 '(1 1.0 #C(1.0 0.0) 2 2.0 #C(2.0 0.0)) :test (complement #'=))
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (1 1.0 #C(1.0 0.0))
|
|
|
|
(count 1 '((one 1) (uno 1) (two 2) (dos 2)) :key #'cadr) <SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> 2
|
|
|
|
(count 2.0 '(1 2 3) :test #'eql :key #'float) <SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> 1
|
|
|
|
(count "FOO" (list (make-pathname :name "FOO" :type "X")
|
|
(make-pathname :name "FOO" :type "Y"))
|
|
:key #'pathname-name
|
|
:test #'equal)
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> 2</PRE
|
|
><H3 ID="sec_17_2_2" CLASS="HeadIII"
|
|
>17.2.2 Satisfying a One-Argument Test</H3
|
|
><P CLASS="j"
|
|
>When using one of the <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>functions</EM
|
|
></A
|
|
> in Figure 17–3, the elements <I
|
|
>E</I
|
|
> of a <A HREF="26_1_Glossary.html#sequence"
|
|
><EM CLASS="term"
|
|
>sequence</EM
|
|
></A
|
|
> <I
|
|
>S</I
|
|
> are filtered not on the basis of the presence or absence of an object <I
|
|
>O</I
|
|
> under a two <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> <A HREF="26_1_Glossary.html#predicate"
|
|
><EM CLASS="term"
|
|
>predicate</EM
|
|
></A
|
|
>, as with the <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>functions</EM
|
|
></A
|
|
> described in <A HREF="17_2_Rules_about_Test_Functions.html#sec_17_2_1" CLASS="secref"
|
|
><SPAN CLASS="cmr"
|
|
>Section</SPAN
|
|
> <SPAN CLASS="cmr"
|
|
>17.2.1</SPAN
|
|
> <SPAN CLASS="cmr"
|
|
>(Satisfying</SPAN
|
|
> <SPAN CLASS="cmr"
|
|
>a</SPAN
|
|
> <SPAN CLASS="cmr"
|
|
>Two-Argument</SPAN
|
|
> <SPAN CLASS="cmr"
|
|
>Test)</SPAN
|
|
></A
|
|
>, but rather on the basis of a one <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> <A HREF="26_1_Glossary.html#predicate"
|
|
><EM CLASS="term"
|
|
>predicate</EM
|
|
></A
|
|
>.</P
|
|
><DIV CLASS="displaythree"
|
|
><FIGURE CLASS="boxfig"
|
|
><DIV CLASS="figbody"
|
|
><TABLE CELLSPACING="0" CELLPADDING="0" RULES="GROUPS" STYLE="margin: 1ex 0" WIDTH="100%"
|
|
><TBODY
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
><A HREF="f_assoc.html" CLASS="misc"
|
|
><B
|
|
>assoc-if</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_member.html" CLASS="misc"
|
|
><B
|
|
>member-if</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_rassoc.html" CLASS="misc"
|
|
><B
|
|
>rassoc-if</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_assoc.html" CLASS="misc"
|
|
><B
|
|
>assoc-if-not</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_member.html" CLASS="misc"
|
|
><B
|
|
>member-if-not</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_rassoc.html" CLASS="misc"
|
|
><B
|
|
>rassoc-if-not</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_count.html" CLASS="misc"
|
|
><B
|
|
>count-if</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_subst.html" CLASS="misc"
|
|
><B
|
|
>nsubst-if</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_remove.html" CLASS="misc"
|
|
><B
|
|
>remove-if</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_count.html" CLASS="misc"
|
|
><B
|
|
>count-if-not</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_subst.html" CLASS="misc"
|
|
><B
|
|
>nsubst-if-not</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_remove.html" CLASS="misc"
|
|
><B
|
|
>remove-if-not</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_remove.html" CLASS="misc"
|
|
><B
|
|
>delete-if</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_substitute.html" CLASS="misc"
|
|
><B
|
|
>nsubstitute-if</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_subst.html" CLASS="misc"
|
|
><B
|
|
>subst-if</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_remove.html" CLASS="misc"
|
|
><B
|
|
>delete-if-not</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_substitute.html" CLASS="misc"
|
|
><B
|
|
>nsubstitute-if-not</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_subst.html" CLASS="misc"
|
|
><B
|
|
>subst-if-not</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_find.html" CLASS="misc"
|
|
><B
|
|
>find-if</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_position.html" CLASS="misc"
|
|
><B
|
|
>position-if</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_substitute.html" CLASS="misc"
|
|
><B
|
|
>substitute-if</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE=";padding-right:1em"
|
|
> <A HREF="f_find.html" CLASS="misc"
|
|
><B
|
|
>find-if-not</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;padding-right:1em"
|
|
> <A HREF="f_position.html" CLASS="misc"
|
|
><B
|
|
>position-if-not</B
|
|
></A
|
|
></TD
|
|
><TD ALIGN="LEFT" VALIGN="BASELINE" NOWRAP="NOWRAP" STYLE="padding-left:1em;"
|
|
> <A HREF="f_substitute.html" CLASS="misc"
|
|
><B
|
|
>substitute-if-not</B
|
|
></A
|
|
></TD
|
|
></TR
|
|
></TBODY
|
|
></TABLE
|
|
></DIV
|
|
><FIGCAPTION CLASS="caption"
|
|
><B
|
|
>Figure 17–3. Operators that have One-Argument Tests to be Satisfied</B
|
|
></FIGCAPTION
|
|
></FIGURE
|
|
></DIV
|
|
><P CLASS="j"
|
|
>The element <I
|
|
>E</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> might not be considered directly. If a <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:key</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> is provided, it is a <A HREF="26_1_Glossary.html#designator"
|
|
><EM CLASS="term"
|
|
>designator</EM
|
|
></A
|
|
> for a <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>function</EM
|
|
></A
|
|
> of one <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
> to be called with each <I
|
|
>E</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> as an <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
>, and <A HREF="26_1_Glossary.html#yield"
|
|
><EM CLASS="term"
|
|
>yielding</EM
|
|
></A
|
|
> an <A HREF="26_1_Glossary.html#object"
|
|
><EM CLASS="term"
|
|
>object</EM
|
|
></A
|
|
> <I
|
|
>Z</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> to be used for comparison. (If there is no <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:key</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
|
></A
|
|
>, <I
|
|
>Z</I
|
|
><SUB CLASS="sub"
|
|
><I
|
|
>i</I
|
|
></SUB
|
|
> is <I
|
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>E</I
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><SUB CLASS="sub"
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><I
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>i</I
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>.) </P
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><P CLASS="j"
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><A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>Functions</EM
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></A
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> defined in this specification and having a name that ends in “<CODE CLASS="f"
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>-if</CODE
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>” accept a first <A HREF="26_1_Glossary.html#argument"
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><EM CLASS="term"
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>argument</EM
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></A
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> that is a <A HREF="26_1_Glossary.html#designator"
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><EM CLASS="term"
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>designator</EM
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></A
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> for a <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> of one <A HREF="26_1_Glossary.html#argument"
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><EM CLASS="term"
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>argument</EM
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></A
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>, <I
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>Z</I
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><SUB CLASS="sub"
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><I
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>i</I
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></SUB
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>. An <I
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>E</I
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><SUB CLASS="sub"
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><I
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>i</I
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></SUB
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> is said to <DFN CLASS="newterm"
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><SPAN CLASS="cmbxsl"
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>satisfy</SPAN
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> <SPAN CLASS="cmbxsl"
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>the</SPAN
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> <SPAN CLASS="cmbxsl"
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>test</SPAN
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></DFN
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> <SPAN CLASS="idx" DATA-KIND="idxterm" DATA-TERM="satisfy the test"
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></SPAN
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>if this <SPAN CLASS="kwd"
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><SPAN CLASS="cmtt"
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>:test</SPAN
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></SPAN
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> <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> returns a <A HREF="26_1_Glossary.html#generalized_boolean"
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><EM CLASS="term"
|
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>generalized boolean</EM
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></A
|
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> representing <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
|
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>true</EM
|
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></A
|
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>. </P
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><P CLASS="j"
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><A HREF="26_1_Glossary.html#function"
|
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><EM CLASS="term"
|
|
>Functions</EM
|
|
></A
|
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> defined in this specification and having a name that ends in “<CODE CLASS="f"
|
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>-if-not</CODE
|
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>” accept a first <A HREF="26_1_Glossary.html#argument"
|
|
><EM CLASS="term"
|
|
>argument</EM
|
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></A
|
|
> that is a <A HREF="26_1_Glossary.html#designator"
|
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><EM CLASS="term"
|
|
>designator</EM
|
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></A
|
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> for a <A HREF="26_1_Glossary.html#function"
|
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><EM CLASS="term"
|
|
>function</EM
|
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></A
|
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> of one <A HREF="26_1_Glossary.html#argument"
|
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><EM CLASS="term"
|
|
>argument</EM
|
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></A
|
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>, <I
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>Z</I
|
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><SUB CLASS="sub"
|
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><I
|
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>i</I
|
|
></SUB
|
|
>. An <I
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>E</I
|
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><SUB CLASS="sub"
|
|
><I
|
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>i</I
|
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></SUB
|
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> is said to <DFN CLASS="newterm"
|
|
><SPAN CLASS="cmbxsl"
|
|
>satisfy</SPAN
|
|
> <SPAN CLASS="cmbxsl"
|
|
>the</SPAN
|
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> <SPAN CLASS="cmbxsl"
|
|
>test</SPAN
|
|
></DFN
|
|
> <SPAN CLASS="idx" DATA-KIND="idxterm" DATA-TERM="satisfy the test"
|
|
></SPAN
|
|
>if this <SPAN CLASS="kwd"
|
|
><SPAN CLASS="cmtt"
|
|
>:test</SPAN
|
|
></SPAN
|
|
> <A HREF="26_1_Glossary.html#function"
|
|
><EM CLASS="term"
|
|
>function</EM
|
|
></A
|
|
> returns a <A HREF="26_1_Glossary.html#generalized_boolean"
|
|
><EM CLASS="term"
|
|
>generalized boolean</EM
|
|
></A
|
|
> representing <A HREF="26_1_Glossary.html#false"
|
|
><EM CLASS="term"
|
|
>false</EM
|
|
></A
|
|
>.</P
|
|
><H4 ID="sec_17_2_2_1" CLASS="HeadIV"
|
|
>17.2.2.1 Examples of Satisfying a One-Argument Test</H4
|
|
><PRE CLASS="screen"
|
|
> (count-if #'zerop '(1 #C(0.0 0.0) 0 0.0d0 0.0s0 3)) <SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> 4
|
|
|
|
(remove-if-not #'symbolp '(0 1 2 3 4 5 6 7 8 9 A B C D E F))
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (A B C D E F)
|
|
(remove-if (complement #'symbolp) '(0 1 2 3 4 5 6 7 8 9 A B C D E F))
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> (A B C D E F)
|
|
|
|
(count-if #'zerop '("foo" "" "bar" "" "" "baz" "quux") :key #'length)
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> 3</PRE
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