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return(n) Tcl Built-In Commands return(n)
return - Return from a procedure
return ?-code code? ?-errorinfo info? ?-errorcode code? ?string?
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.
In the usual case where the -code option isn't specified the procedure will return nor-
mally (its completion code will be TCL_OK). However, the -code option may be used to gen-
erate an exceptional return from the procedure. Code may have any of the following val-
ok Normal return: same as if the option is omitted.
error Error return: same as if the error command were used to terminate the procedure,
except for handling of errorInfo and errorCode variables (see below).
return The current procedure will return with a completion code of TCL_RETURN, so that
the procedure that invoked it will return also.
break 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
continue 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.
value Value must be an integer; it will be returned as the completion code for the
The -code option is rarely used. It is provided so that procedures that implement new
control structures can 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 pro-
cedure 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 supplied from the
value left in errorInfo after a catch command trapped an error within the procedure.
If the -errorcode option is specified then code provides a value for the errorCode vari-
able. If the option is not specified then errorCode will default to NONE.
break(n), continue(n), error(n), proc(n)
break, continue, error, procedure, return
Tcl 7.0 return(n)
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