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author | William Joye <wjoye@cfa.harvard.edu> | 2017-09-22 18:51:12 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2017-09-22 18:51:12 (GMT) |
commit | 3fa8e6dc88e8041b6cb88d1b1e9c05676d3346b7 (patch) | |
tree | 69afbb41089c8358615879f7cd3c4cf7997f4c7e /tcl8.6/doc/tailcall.n | |
parent | a0e17db23c0fd7c771c0afce8cce350c98f90b02 (diff) | |
download | blt-3fa8e6dc88e8041b6cb88d1b1e9c05676d3346b7.zip blt-3fa8e6dc88e8041b6cb88d1b1e9c05676d3346b7.tar.gz blt-3fa8e6dc88e8041b6cb88d1b1e9c05676d3346b7.tar.bz2 |
update to tcl/tk 8.6.7
Diffstat (limited to 'tcl8.6/doc/tailcall.n')
-rw-r--r-- | tcl8.6/doc/tailcall.n | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/tcl8.6/doc/tailcall.n b/tcl8.6/doc/tailcall.n deleted file mode 100644 index 926c608..0000000 --- a/tcl8.6/doc/tailcall.n +++ /dev/null @@ -1,69 +0,0 @@ -'\" -'\" Copyright (c) 1993 The Regents of the University of California. -'\" Copyright (c) 1994-1996 Sun Microsystems, Inc. -'\" -'\" See the file "license.terms" for information on usage and redistribution -'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. -'\" -.TH tailcall n 8.6 Tcl "Tcl Built-In Commands" -.so man.macros -.BS -'\" Note: do not modify the .SH NAME line immediately below! -.SH NAME -tailcall \- Replace the current procedure with another command -.SH SYNOPSIS -\fBtailcall \fIcommand\fR ?\fIarg ...\fR? -.BE -.SH DESCRIPTION -.PP -The \fBtailcall\fR command replaces the currently executing procedure, lambda -application, or method with another command. The \fIcommand\fR, which will -have \fIarg ...\fR passed as arguments if they are supplied, will be looked up -in the current namespace context, not in the caller's. Apart from that -difference in resolution, it is equivalent to: -.PP -.CS -return [uplevel 1 [list \fIcommand\fR ?\fIarg ...\fR?]] -.CE -.PP -This command may not be invoked from within an \fBuplevel\fR into a procedure -or inside a \fBcatch\fR inside a procedure or lambda. -'\" TODO: sort out the mess with the [try] command! -.SH EXAMPLE -.PP -Compute the factorial of a number. -.PP -.CS -proc factorial {n {accum 1}} { - if {$n < 2} { - return $accum - } - \fBtailcall\fR factorial [expr {$n - 1}] [expr {$accum * $n}] -} -.CE -.PP -Print the elements of a list with alternating lines having different -indentations. -.PP -.CS -proc printList {theList} { - if {[llength $theList]} { - puts "> [lindex $theList 0]" - \fBtailcall\fR printList2 [lrange $theList 1 end] - } -} -proc printList2 {theList} { - if {[llength $theList]} { - puts "< [lindex $theList 0]" - \fBtailcall\fR printList [lrange $theList 1 end] - } -} -.CE -.SH "SEE ALSO" -apply(n), proc(n), uplevel(n) -.SH KEYWORDS -call, recursion, tail recursion -'\" Local Variables: -'\" mode: nroff -'\" fill-column: 78 -'\" End: |