diff options
Diffstat (limited to 'doc/uplevel.n')
| -rw-r--r-- | doc/uplevel.n | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/doc/uplevel.n b/doc/uplevel.n index d1e5dc1..f4a26e7 100644 --- a/doc/uplevel.n +++ b/doc/uplevel.n @@ -5,7 +5,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: uplevel.n,v 1.10 2007/12/13 15:22:33 dgp Exp $ +'\" RCS: @(#) $Id: uplevel.n,v 1.11 2008/10/17 10:22:25 dkf Exp $ '\" .so man.macros .TH uplevel n "" Tcl "Tcl Built-In Commands" @@ -42,16 +42,20 @@ at top-level (only global variables will be visible). The \fBuplevel\fR command causes the invoking procedure to disappear from the procedure calling stack while the command is being executed. In the above example, suppose \fBc\fR invokes the command +.PP .CS \fBuplevel\fR 1 {set x 43; d} .CE +.PP where \fBd\fR is another Tcl procedure. The \fBset\fR command will modify the variable \fBx\fR in \fBb\fR's context, and \fBd\fR will execute at level 3, as if called from \fBb\fR. If it in turn executes the command +.PP .CS \fBuplevel\fR {set x 42} .CE +.PP then the \fBset\fR command will modify the same variable \fBx\fR in \fBb\fR's context: the procedure \fBc\fR does not appear to be on the call stack when \fBd\fR is executing. The \fBinfo level\fR command may @@ -77,6 +81,7 @@ control constructs. This example shows how (without error handling) it can be used to create a \fBdo\fR command that is the counterpart of \fBwhile\fR except for always performing the test after running the loop body: +.PP .CS proc do {body while condition} { if {$while ne "while"} { @@ -95,3 +100,6 @@ proc do {body while condition} { apply(n), namespace(n), upvar(n) .SH KEYWORDS context, level, namespace, stack frame, variables +.\" Local Variables: +.\" mode: nroff +.\" End: |