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return.n
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1993-07-16
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'\"
'\" Copyright (c) 1993 The Regents of the University of California.
'\" All rights reserved.
'\"
'\" Permission is hereby granted, without written agreement and without
'\" license or royalty fees, to use, copy, modify, and distribute this
'\" documentation for any purpose, provided that the above copyright
'\" notice and the following two paragraphs appear in all copies.
'\"
'\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
'\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
'\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
'\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
'\"
'\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
'\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
'\" AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
'\" ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
'\" PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
'\"
'\" $Header: /user6/ouster/tcl/man/RCS/return.n,v 1.5 93/07/16 16:31:07 ouster Exp $ SPRITE (Berkeley)
'\"
.so man.macros
.HS return tcl 7.0
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
return \- Return from a procedure
.SH SYNOPSIS
\fBreturn \fR?\fB\-code \fIcode\fR? ?\fIstring\fR?
.BE
.SH DESCRIPTION
.PP
Return immediately from the current procedure
(or top-level command or \fBsource\fR command),
with \fIstring\fR as the return value. If \fIstring\fR is not specified then
an empty string will be returned as result.
.PP
In the usual case where the \fB\-code\fR option isn't
.VS
specified the procedure will return normally (its completion
code will be TCL_OK).
However, the \fB\-code\fR option may be used to cause the
procedure to return with an exceptional completion code,
which will generate an exception in the script that invoked the procedure.
\fICode\fR may have any of the following values:
.TP 10
\fBok\fR
Normal return: same as if the option is omitted.
.TP 10
\fBerror\fR
Error return: same as if the \fBerror\fR command were used to
terminate the procedure.
.TP 10
\fBreturn\fR
The current procedure will return with a completion code of
TCL_RETURN, so that the procedure that invoked it will return
also.
.TP 10
\fBbreak\fR
The current procedure will return with a completion code of
TCL_BREAK, which will terminate the innermost nested loop in
the code that invoked the current procedure.
.TP 10
\fBcontinue\fR
The current procedure will return with a completion code of
TCL_CONTINUE, which will terminate the current iteration of
the innermost nested loop in the code that invoked the current
procedure.
.TP 10
\fIvalue\fR
\fIValue\fR must be an integer; it will be returned as the
completion code for the current procedure.
.LP
The \fB\-code\fR option is rarely used.
It is provided so that procedures that implement
new control structures can reflect exceptional conditions back to
their callers.
.VE
.SH KEYWORDS
break, continue, error, procedure, return