77 lines
5.9 KiB
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77 lines
5.9 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: Function INVOKE-RESTART-INTERACTIVELY</TITLE>
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<A NAME="invoke-restart-interactively"><I>Function</I> <B>INVOKE-RESTART-INTERACTIVELY</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>invoke-restart-interactively</B> <I>restart</I> => <I><I>result</I><B>*</B></I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>restart</I>---a <A REL=DEFINITION HREF="26_glo_r.htm#restart_designator"><I>restart designator</I></A>. <P>
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<I>results</I>---the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>values</I></A> returned by the <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> associated with <I>restart</I>, if that <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> returns. <P>
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<P><B>Description:</B><P>
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<P>
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<A REL=DEFINITION HREF="#invoke-restart-interactively"><B>invoke-restart-interactively</B></A> calls the <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> associated with <I>restart</I>, prompting for any necessary arguments. If <I>restart</I> is a name, it must be valid in the current <A REL=DEFINITION HREF="26_glo_d.htm#dynamic_environment"><I>dynamic environment</I></A>. <P>
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<A REL=DEFINITION HREF="#invoke-restart-interactively"><B>invoke-restart-interactively</B></A> prompts for arguments by executing the code provided in the <TT>:interactive</TT> keyword to <A REL=DEFINITION HREF="m_rst_ca.htm#restart-case"><B>restart-case</B></A> or <TT>:interactive-function</TT> keyword to <A REL=DEFINITION HREF="m_rst_bi.htm#restart-bind"><B>restart-bind</B></A>. <P>
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If no such options have been supplied in the corresponding <A REL=DEFINITION HREF="m_rst_bi.htm#restart-bind"><B>restart-bind</B></A> or <A REL=DEFINITION HREF="m_rst_ca.htm#restart-case"><B>restart-case</B></A>, then the consequences are undefined if the <I>restart</I> takes required arguments. If the arguments are optional, an argument list of <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> is used. <P>
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Once the arguments have been determined, <A REL=DEFINITION HREF="#invoke-restart-interactively"><B>invoke-restart-interactively</B></A> executes the following: <P>
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<PRE>
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(apply #'invoke-restart restart arguments)
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</PRE>
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</TT> <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(defun add3 (x) (check-type x number) (+ x 3))
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(add3 'seven)
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>> Error: The value SEVEN was not of type NUMBER.
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>> To continue, type :CONTINUE followed by an option number:
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>> 1: Specify a different value to use.
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>> 2: Return to Lisp Toplevel.
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>> Debug> (invoke-restart-interactively 'store-value)
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>> Type a form to evaluate and use: 7
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=> 10
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B><P>
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<P>
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If prompting for arguments is necesary, some typeout may occur (on <A REL=DEFINITION HREF="26_glo_q.htm#query_iSLo"><I>query I/O</I></A>). <P>
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A non-local transfer of control might be done by the restart. <P>
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<P><B>Affected By:</B><P>
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<P>
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<A REL=DEFINITION HREF="v_debug_.htm#STquery-ioST"><B>*query-io*</B></A>, active <A REL=DEFINITION HREF="26_glo_r.htm#restart"><I>restarts</I></A> <P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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If <I>restart</I> is not valid, an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_contro.htm#control-error"><B>control-error</B></A> is signaled. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_find_r.htm#find-restart"><B>find-restart</B></A>, <A REL=DEFINITION HREF="f_invo_1.htm#invoke-restart"><B>invoke-restart</B></A>, <A REL=DEFINITION HREF="m_rst_ca.htm#restart-case"><B>restart-case</B></A>, <A REL=DEFINITION HREF="m_rst_bi.htm#restart-bind"><B>restart-bind</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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<A REL=DEFINITION HREF="#invoke-restart-interactively"><B>invoke-restart-interactively</B></A> is used internally by the debugger and may also be useful in implementing other portable, interactive debugging tools. <P>
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