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>remprop | Common Lisp Nova Spec</TITLE
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><DIV CLASS="breadcrumb"
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><SPAN CLASS="breadcrumb-item"
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><A HREF="index.html"
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>Common Lisp Nova Spec</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="10_Symbols.html"
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>10. Symbols</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="10_2_Symbols_Dictionary.html"
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>10.2 Symbols Dictionary</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_remprop.html"
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>remprop</A
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><DIV CLASS="apropos-io"
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><A HREF="f_get.html" CLASS="prev"
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>←</A
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><SPAN ID="apropos-label"
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>Apropos </SPAN
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><INPUT ID="apropos" AUTOFOCUS="AUTOFOCUS" PLACEHOLDER="Type here to search" ONINPUT="aproposInput(this);" ONKEYUP="aproposKeyup(event);" ONCHANGE="aproposChange(this);" ONFOCUS="aproposFocus(this);" ONFOCUSOUT="aproposFocusout(this);"
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><DIV CLASS="matter"
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><DIV CLASS="com"
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><DIV CLASS="begincom"
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><HR
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><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="remprop"
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></SPAN
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><B
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>remprop</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Function</I
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></TD
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></TR
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></TABLE
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><HR
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></DIV
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><UL CLASS="subtoc"
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></UL
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><P CLASS="j"
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><B
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>remprop</B
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> <SPAN CLASS="cmssi"
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>symbol</SPAN
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> <SPAN CLASS="cmssi"
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>indicator</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> <SPAN CLASS="cmssi"
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>generalized-boolean</SPAN
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></P
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></DD
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><DT
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>symbol</VAR
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> — a <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>indicator</VAR
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> — 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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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>generalized-boolean</VAR
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> — 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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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_remprop.html" CLASS="funref"
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><B
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>remprop</B
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></A
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> removes from the <A HREF="26_1_Glossary.html#property_list"
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><EM CLASS="term"
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>property list</EM
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></A
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><SPAN CLASS="meaning"
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><SUB CLASS="sub"
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><SPAN CLASS="cmr"
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>2</SPAN
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></SUB
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></SPAN
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> of <VAR CLASS="param"
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>symbol</VAR
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> a <A HREF="26_1_Glossary.html#property"
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><EM CLASS="term"
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>property</EM
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></A
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><SPAN CLASS="meaning"
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><SUB CLASS="sub"
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><SPAN CLASS="cmr"
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>1</SPAN
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></SUB
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></SPAN
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> with a <A HREF="26_1_Glossary.html#property_indicator"
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><EM CLASS="term"
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>property indicator</EM
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></A
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> <A HREF="26_1_Glossary.html#identical"
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><EM CLASS="term"
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>identical</EM
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></A
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> to <VAR CLASS="param"
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>indicator</VAR
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>. If there are multiple <EM CLASS="term"
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>properties</EM
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><SPAN CLASS="meaning"
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><SUB CLASS="sub"
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><SPAN CLASS="cmr"
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>1</SPAN
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></SUB
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></SPAN
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> with the <A HREF="26_1_Glossary.html#identical"
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><EM CLASS="term"
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>identical</EM
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></A
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> key, <A HREF="f_remprop.html" CLASS="funref"
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><B
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>remprop</B
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></A
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> only removes the first such <A HREF="26_1_Glossary.html#property"
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><EM CLASS="term"
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>property</EM
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></A
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>. <A HREF="f_remprop.html" CLASS="funref"
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><B
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>remprop</B
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></A
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> returns <A HREF="26_1_Glossary.html#false"
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><EM CLASS="term"
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>false</EM
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></A
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> if no such <A HREF="26_1_Glossary.html#property"
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><EM CLASS="term"
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>property</EM
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></A
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> was found, or <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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> if a property was found. </P
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#property_indicator"
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><EM CLASS="term"
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>property indicator</EM
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></A
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> and the corresponding <A HREF="26_1_Glossary.html#property_value"
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><EM CLASS="term"
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>property value</EM
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></A
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> are removed in an undefined order by destructively splicing the property list. The permissible side-effects correspond to those permitted for <A HREF="f_remf.html" CLASS="macref"
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><B
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>remf</B
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></A
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>, such that:</P
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><PRE CLASS="screen"
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>(remprop <I CLASS="i"
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><I
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>x</I
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></I
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> <I CLASS="i"
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><I
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>y</I
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></I
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>) <SPAN CLASS="cmsy"
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><SPAN STYLE="font-size:16px;vertical-align:-2px"
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>≡</SPAN
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></SPAN
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> (remf (symbol-plist <I CLASS="i"
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><I
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>x</I
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></I
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>) <I CLASS="i"
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><I
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>y</I
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></I
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>)</PRE
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></DD
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><DT
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><B
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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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> (setq test (make-symbol "PSEUDO-PI")) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> #:PSEUDO-PI
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(symbol-plist test) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> ()
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(setf (get test 'constant) t) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> T
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(setf (get test 'approximation) 3.14) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 3.14
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(setf (get test 'error-range) 'noticeable) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> NOTICEABLE
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(symbol-plist test)
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (ERROR-RANGE NOTICEABLE APPROXIMATION 3.14 CONSTANT T)
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(setf (get test 'approximation) nil) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> NIL
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(symbol-plist test)
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (ERROR-RANGE NOTICEABLE APPROXIMATION NIL CONSTANT T)
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(get test 'approximation) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> NIL
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(remprop test 'approximation) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <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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>
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(get test 'approximation) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> NIL
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(symbol-plist test)
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (ERROR-RANGE NOTICEABLE CONSTANT T)
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(remprop test 'approximation) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> NIL
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(symbol-plist test)
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (ERROR-RANGE NOTICEABLE CONSTANT T)
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(remprop test 'error-range) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <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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>
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(setf (get test 'approximation) 3) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 3
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(symbol-plist test)
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (APPROXIMATION 3 CONSTANT T)</PRE
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></DD
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><DT
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><B
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>Side Effects</B
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></DT
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><DD
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#property_list"
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><EM CLASS="term"
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>property list</EM
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></A
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> of <VAR CLASS="param"
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>symbol</VAR
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> is modified.</P
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></DD
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><DT
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><B
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>Exceptional Situations</B
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></DT
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><DD
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><P CLASS="j"
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>Should signal an error of <A HREF="26_1_Glossary.html#type"
|
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><EM CLASS="term"
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>type</EM
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></A
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> <A HREF="t_type-error.html" CLASS="typeref"
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><B
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>type-error</B
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></A
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> if <VAR CLASS="param"
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>symbol</VAR
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> is not a <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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>.</P
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></DD
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><DT
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><B
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>See Also</B
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></DT
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><DD
|
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><P CLASS="j"
|
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><A HREF="f_remf.html" CLASS="macref"
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><B
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>remf</B
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></A
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>, <A HREF="f_symbol-plist.html" CLASS="funref"
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><B
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>symbol-plist</B
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></A
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></P
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></DD
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><DT
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><B
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>Notes</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="26_1_Glossary.html#number"
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><EM CLASS="term"
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>Numbers</EM
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></A
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> and <A HREF="26_1_Glossary.html#character"
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><EM CLASS="term"
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>characters</EM
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></A
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> are not recommended for use as <VAR CLASS="param"
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>indicators</VAR
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> in portable code since <A HREF="f_remprop.html" CLASS="funref"
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><B
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>remprop</B
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></A
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> tests with <A HREF="f_eq.html" CLASS="funref"
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><B
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>eq</B
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></A
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> rather than <A HREF="f_eql.html" CLASS="funref"
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><B
|
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>eql</B
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></A
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>, and consequently the effect of using such <VAR CLASS="param"
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>indicators</VAR
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> is <A HREF="26_1_Glossary.html#implementation-dependent"
|
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><EM CLASS="term"
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>implementation-dependent</EM
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></A
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>. Of course, if you’ve gotten as far as needing to remove such a <A HREF="26_1_Glossary.html#property"
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><EM CLASS="term"
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>property</EM
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></A
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>, you don’t have much choice — the time to have been thinking about this was when you used <A HREF="f_setf.html" CLASS="macref"
|
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><B
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>setf</B
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></A
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> of <A HREF="f_get.html" CLASS="funref"
|
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><B
|
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>get</B
|
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></A
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> to establish the <A HREF="26_1_Glossary.html#property"
|
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><EM CLASS="term"
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>property</EM
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></A
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>.</P
|
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></DD
|
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></DL
|
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></DIV
|
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></DIV
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><A HREF="f_get.html" CLASS="prev"
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>→</A
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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