>Actually, that is not entirely accurate. By using push/pop classes you can code with more freedom. There are those that will say, you shouldn't have more than one exit point. You should have the freedom to code without petty rules. You should not have to worry about simple human mistakes, like forgetting to reset. There are fewer lines of code to write, so you should be able to code faster. In my example I'm showing that the push/pop class could also change the SET command. IMO, you are most likely pushing the value because you want to change it. I put the vartype check before the set safety. With the pushpop, I could accidentally put the vartype check after the pushpop createobject and it would still work. There could be a business requirement requiring an early exit.

>

LPARAMETERS m.tcVar
>IF VARTYPE(m.tcVar) # "C"
>  RETURN .F.
>ENDIF
>LOCAL m.lcSafety
>m.lcSafety = SET("SAFETY")
>SET SAFETY OFF
>* ... some processing
>IF somebusinesscondition = .F.
>  SET SAFETY &lcSafety. && You have to remember to reset it here.
>  RETURN .F.
>ENDIF
>DO SOMETHING
>SET SAFETY &lcSafety.
>RETURN

While I agree that the cSet class (which exists as a freebie in the CodeBook, and is inherited in at least one CodeBook-derived framework that I used) makes things simple, your example of an early exit is slightly wrong - the exit is not early enough. If you're exiting early, you should do so before you change any SETtings:

LPARAMETERS m.tcVar
IF VARTYPE(m.tcVar) # "C"
  RETURN .F.
ENDIF
IF not somebusinesscondition
  RETURN .F.
ENDIF
* now we're doing business, save settings and do it
LOCAL m.lcSafety
m.lcSafety = SET("SAFETY")
SET SAFETY OFF
* ... some processing
DO SOMETHING
* ...done, restore.
SET SAFETY &lcSafety.
RETURN

Of course, there may be other exits that may be required during the business part, but these may be bracketed using a simple status variable:

lOK=SomeCheck()
if lOK
   * do some more
   lOK={new check condition}
endif

if lOK
   * keep on processing
   lOK={another check condition}
endif
* done, restore

This way you don't have to have other exits but the early exits (before you disturb the settings) and one final exit (where you restore the settings).