305 lines
5.7 KiB
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305 lines
5.7 KiB
HTML
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<!DOCTYPE HTML>
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<HTML LANG="en-us"
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>+, ++, +++ | Common Lisp Nova Spec</TITLE
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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="25_Environment.html"
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>25. Environment</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="25_2_Environment_Dictionary.html"
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>25.2 Environment Dictionary</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="v__plus.html"
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>+, ++, +++</A
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>←</A
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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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>→</A
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></DIV
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></DIV
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><DIV CLASS="matter"
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><DIV CLASS="com"
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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="+, ++, +++"
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></SPAN
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><B
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>+, ++, +++</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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>Variable</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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>Value Type</B
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></DT
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><DD
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><P CLASS="j"
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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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></DD
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><DT
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><B
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>Initial Value</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#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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>.</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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>The <A HREF="26_1_Glossary.html#variable"
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><EM CLASS="term"
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>variables</EM
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></A
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> <A HREF="v__plus.html" CLASS="varref"
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><B
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>+</B
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></A
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>, <A HREF="v__plus.html" CLASS="misc"
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><B
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>++</B
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></A
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>, and <A HREF="v__plus.html" CLASS="misc"
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><B
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>+++</B
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></A
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> are maintained by the <A HREF="26_1_Glossary.html#Lisp_read-eval-print_loop"
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><EM CLASS="term"
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>Lisp read-eval-print loop</EM
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></A
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> to save <A HREF="26_1_Glossary.html#form"
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><EM CLASS="term"
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>forms</EM
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></A
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> that were recently <A HREF="26_1_Glossary.html#evaluate"
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><EM CLASS="term"
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>evaluated</EM
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></A
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>. </P
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>value</EM
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></A
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> of <SPAN CLASS="misc"
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><B
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>+</B
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></SPAN
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> is the last <A HREF="26_1_Glossary.html#form"
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><EM CLASS="term"
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>form</EM
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></A
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> that was <A HREF="26_1_Glossary.html#evaluate"
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><EM CLASS="term"
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>evaluated</EM
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></A
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>, the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>value</EM
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></A
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> of <A HREF="v__plus.html" CLASS="misc"
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><B
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>++</B
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></A
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> is the previous value of <SPAN CLASS="misc"
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><B
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>+</B
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></SPAN
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>, and the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>value</EM
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></A
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> of <A HREF="v__plus.html" CLASS="misc"
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><B
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>+++</B
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></A
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> is the previous value of <A HREF="v__plus.html" CLASS="misc"
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><B
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>++</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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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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>(+ 0 1) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 1
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(- 4 2) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 2
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(/ 9 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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(list + ++ +++) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> ((/ 9 3) (- 4 2) (+ 0 1))
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(setq a 1 b 2 c 3 d (list a b c)) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 2 3)
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(setq a 4 b 5 c 6 d (list a b c)) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (4 5 6)
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(list a b c) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (4 5 6)
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(eval +++) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 2 3)
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#.`(,@++ d) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 2 3 (1 2 3))</PRE
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></DD
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><DT
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><B
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>Affected By</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#Lisp_read-eval-print_loop"
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><EM CLASS="term"
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>Lisp read-eval-print loop</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__minus.html" CLASS="funref"
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><B
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>-</B
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></A
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> (<A HREF="26_1_Glossary.html#variable"
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><EM CLASS="term"
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>variable</EM
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></A
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>), <A HREF="f__star.html" CLASS="funref"
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><B
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>*</B
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></A
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> (<A HREF="26_1_Glossary.html#variable"
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><EM CLASS="term"
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>variable</EM
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></A
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>), <A HREF="f__dash.html" CLASS="funref"
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><B
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>/</B
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></A
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> (<A HREF="26_1_Glossary.html#variable"
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><EM CLASS="term"
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>variable</EM
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></A
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>), <A HREF="25_1_The_External_Environment.html#sec_25_1_1" CLASS="secref"
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><SPAN CLASS="cmr"
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>Section</SPAN
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> <SPAN CLASS="cmr"
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>25.1.1</SPAN
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> <SPAN CLASS="cmr"
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>(Top</SPAN
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> <SPAN CLASS="cmr"
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>level</SPAN
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> <SPAN CLASS="cmr"
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>loop)</SPAN
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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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><DIV CLASS="footer"
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><DIV CLASS="btmnav"
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><A HREF="v__minus.html" CLASS="prev"
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>←</A
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>→</A
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><DIV CLASS="trail"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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