diff options
Diffstat (limited to 'doc/proc.n')
| -rw-r--r-- | doc/proc.n | 27 |
1 files changed, 18 insertions, 9 deletions
@@ -14,7 +14,6 @@ proc \- Create a Tcl procedure .SH SYNOPSIS \fBproc \fIname args body\fR .BE - .SH DESCRIPTION .PP The \fBproc\fR command creates a new Tcl procedure named @@ -54,7 +53,7 @@ error). There is one special case to permit procedures with variable numbers of arguments. If the last formal argument has the name \fBargs\fR, then a call to the procedure may contain more actual arguments -than the procedure has formals. In this case, all of the actual arguments +than the procedure has formal arguments. In this case, all of the actual arguments starting at the one that would be assigned to \fBargs\fR are combined into a list (as if the \fBlist\fR command had been used); this combined value is assigned to the local variable \fBargs\fR. @@ -65,6 +64,12 @@ deleted when the procedure returns. One local variable is automatically created for each of the procedure's arguments. Other variables can only be accessed by invoking one of the \fBglobal\fR, \fBvariable\fR, \fBupvar\fR or \fBnamespace upvar\fR commands. +The current namespace when \fIbody\fR is executed will be the +namespace that the procedure's name exists in, which will be the +namespace that it was created in unless it has been changed with +\fBrename\fR. +'\" We may change this! It makes [variable] unstable when renamed and is +'\" frankly pretty crazy, but doing it right is harder than it looks. .PP The \fBproc\fR command returns an empty string. When a procedure is invoked, the procedure's return value is the value specified in a @@ -74,28 +79,32 @@ executed in the procedure's body. If an error occurs while executing the procedure body, then the procedure-as-a-whole will return that same error. .SH EXAMPLES +.PP This is a procedure that accepts arbitrarily many arguments and prints them out, one by one. +.PP .CS \fBproc\fR printArguments args { - foreach arg $args { - puts $arg - } + foreach arg $args { + puts $arg + } } .CE .PP This procedure is a bit like the \fBincr\fR command, except it multiplies the contents of the named variable by the value, which defaults to \fB2\fR: +.PP .CS \fBproc\fR mult {varName {multiplier 2}} { - upvar 1 $varName var - set var [expr {$var * $multiplier}] + upvar 1 $varName var + set var [expr {$var * $multiplier}] } .CE - .SH "SEE ALSO" info(n), unknown(n) - .SH KEYWORDS argument, procedure +'\" Local Variables: +'\" mode: nroff +'\" End: |