return(3Tcl) return(3Tcl)
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 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 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 procedure.
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 current procedure. |
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 procedure and higher levels on the stack but|
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return(3Tcl) return(3Tcl)
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 variable. If the option is not specified then errorCode will |
default to NONE.
break, continue, error, procedure, return
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