69 lines
4.2 KiB
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69 lines
4.2 KiB
HTML
<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Restart MUFFLE-WARNING</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="r_contin.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="c_condit.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="r_store_.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<HR>
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<A NAME="muffle-warning"><I>Restart</I> <B>MUFFLE-WARNING</B></A> <P>
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<P><B>Data Arguments Required:</B><P>
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<P>
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None. <P>
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<P><B>Description:</B><P>
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<P>
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This <A REL=DEFINITION HREF="26_glo_r.htm#restart"><I>restart</I></A> is established by <A REL=DEFINITION HREF="f_warn.htm#warn"><B>warn</B></A> so that <A REL=DEFINITION HREF="26_glo_h.htm#handler"><I>handlers</I></A> of <A REL=DEFINITION HREF="e_warnin.htm#warning"><B>warning</B></A> <A REL=DEFINITION HREF="26_glo_c.htm#condition"><I>conditions</I></A> have a way to tell <A REL=DEFINITION HREF="f_warn.htm#warn"><B>warn</B></A> that a warning has already been dealt with and that no further action is warranted. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(defvar *all-quiet* nil) => *ALL-QUIET*
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(defvar *saved-warnings* '()) => *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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=> 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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=> 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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>> Warning: Situation #2.
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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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>> Situation #3.
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>> Situation #1.
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=> NIL
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</PRE>
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</TT> <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=CHILD HREF="09_adb.htm">Section 9.1.4.2 (Restarts)</A>, <A REL=CHILD HREF="09_adbb.htm">Section 9.1.4.2.2 (Interfaces to Restarts)</A>, <A REL=DEFINITION HREF="f_invo_1.htm#invoke-restart"><B>invoke-restart</B></A>, <A REL=DEFINITION HREF="f_abortc.htm#muffle-warning"><B>muffle-warning</B></A> (<A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A>), <A REL=DEFINITION HREF="f_warn.htm#warn"><B>warn</B></A> <P>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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