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<!DOCTYPE HTML>
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>muffle-warning | Common Lisp Nova Spec</TITLE
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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
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="9_Conditions.html"
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>9. Conditions</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="9_2_Conditions_Dictionary.html"
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>9.2 Conditions Dictionary</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="r_muffle-warning.html"
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>muffle-warning</A
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><DIV CLASS="apropos"
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><DIV CLASS="apropos-io"
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><A HREF="r_continue.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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><HR
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><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
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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="muffle-warning"
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></SPAN
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><B
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>muffle-warning</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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>Restart</I
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></TD
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></TR
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></TABLE
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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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>Data Arguments Required</B
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></DT
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><DD
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><P CLASS="j"
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>None.</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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>This <A HREF="26_1_Glossary.html#restart"
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><EM CLASS="term"
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>restart</EM
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></A
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> is established by <A HREF="f_warn.html" CLASS="funref"
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><B
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>warn</B
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></A
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> so that <A HREF="26_1_Glossary.html#handler"
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><EM CLASS="term"
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>handlers</EM
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></A
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> of <A HREF="t_warning.html" CLASS="typeref"
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><B
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>warning</B
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></A
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> <A HREF="26_1_Glossary.html#condition"
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><EM CLASS="term"
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>conditions</EM
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></A
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> have a way to tell <A HREF="f_warn.html" CLASS="funref"
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><B
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>warn</B
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></A
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> that a warning has already been dealt with and that no further action is warranted.</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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> (defvar *all-quiet* 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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> *ALL-QUIET*
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(defvar *saved-warnings* '()) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> *SAVED-WARNINGS*
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(defun quiet-warning-handler (c)
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(when *all-quiet*
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(let ((r (find-restart 'muffle-warning c)))
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(when r
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(push c *saved-warnings*)
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(invoke-restart r)))))
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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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> CUSTOM-WARNING-HANDLER
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(defmacro with-quiet-warnings (&body forms)
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`(let ((*all-quiet* t)
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(*saved-warnings* '()))
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(handler-bind ((warning #'quiet-warning-handler))
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,@forms
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*saved-warnings*)))
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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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> WITH-QUIET-WARNINGS
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(setq saved
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(with-quiet-warnings
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(warn "Situation #1.")
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(let ((*all-quiet* nil))
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(warn "Situation #2."))
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(warn "Situation #3.")))
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<SPAN CLASS="cmr"
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>⊳</SPAN
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> Warning: Situation #2.
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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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> (#<SIMPLE-WARNING 42744421> #<SIMPLE-WARNING 42744365>)
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(dolist (s saved) (format t "~&~A~%" s))
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<SPAN CLASS="cmr"
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>⊳</SPAN
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> Situation #3.
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<SPAN CLASS="cmr"
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>⊳</SPAN
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> Situation #1.
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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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> NIL</PRE
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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="9_1_Condition_System_Concepts.html#sec_9_1_4_2" 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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>9.1.4.2</SPAN
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> <SPAN CLASS="cmr"
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>(Restarts)</SPAN
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></A
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>, <A HREF="9_1_Condition_System_Concepts.html#sec_9_1_4_2_2" 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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>9.1.4.2.2</SPAN
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> <SPAN CLASS="cmr"
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>(Interfaces</SPAN
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> <SPAN CLASS="cmr"
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>to</SPAN
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> <SPAN CLASS="cmr"
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>Restarts)</SPAN
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></A
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>, <A HREF="f_invoke-restart.html" CLASS="funref"
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><B
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>invoke-restart</B
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></A
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>, <A HREF="f_abort.html" CLASS="funref"
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><B
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>muffle-warning</B
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></A
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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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>), <A HREF="f_warn.html" CLASS="funref"
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><B
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>warn</B
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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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><A HREF="r_continue.html" CLASS="prev"
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>←</A
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>→</A
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></DIV
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><DIV CLASS="trail"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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