return(n) Tcl Built-In Commands return(n)_________________________________________________________________NAMEreturn - Return from a procedure
SYNOPSISreturn ?-code code? ?-errorinfo info? ?-errorcode code?
?string?
_________________________________________________________________DESCRIPTION
Return immediately from the current procedure (or top-
level command or source command), with string as the
return value. If string is not specified then an empty
string will be returned as result.
EXCEPTIONAL RETURNS
In the usual case where the -code option isn't specified
the procedure will return normally (its completion code
will be TCL_OK). However, the -code option may be used to
generate an exceptional return from the procedure. Code
may have any of the following values:
ok Normal return: same as if the option is omit-
ted.
error Error return: same as if the error command were
used to terminate the procedure, except for han-
dling of errorInfo and errorCode variables (see
below).
return The current procedure will return with a comple-
tion code of TCL_RETURN, so that the procedure
that invoked it will return also.
break The current procedure will return with a comple-
tion code of TCL_BREAK, which will terminate the
innermost nested loop in the code that invoked
the current procedure.
continue The current procedure will return with a comple-
tion code of TCL_CONTINUE, which will terminate
the current iteration of the innermost nested
loop in the code that invoked the current proce-
dure.
value Value must be an integer; it will be returned
as the completion code for the current proce-
dure.
The -code option is rarely used. It is provided so that
procedures that implement new control structures can
Tcl 7.0 1
return(n) Tcl Built-In Commands return(n)
reflect exceptional conditions back to their callers.
Two additional options, -errorinfo and -errorcode, may be
used to provide additional information during error
returns. These options are ignored unless code is error.
The -errorinfo option specifies an initial stack trace for
the errorInfo variable; if it is not specified then the
stack trace left in errorInfo will include the call to the
procedure and higher levels on the stack but it will not
include any information about the context of the error
within the procedure. Typically the info value is sup-
plied from the value left in errorInfo after a catch com-
mand trapped an error within the procedure.
If the -errorcode option is specified then code provides a
value for the errorCode variable. If the option is not
specified then errorCode will default to NONE.
KEYWORDS
break, continue, error, procedure, returnTcl 7.0 2