Caché ObjectScript Reference - InterSystems Documentation

Legacy Commands and FunctionsArgumentspcAn optional postconditional expression. Caché executes the command if the postconditionalexpression is true (evaluates to a non-zero numeric value). Caché does not execute the commandif the postconditional expression is false (evaluates to zero). For further details, referto Command Postconditional Expressions in Using Caché ObjectScript.expressionAny valid Caché ObjectScript expression that evaluates to an integer greater than 0. Cachéplatforms use the settings of $ZTRAP to clear the program stack back to the setting indicatedby the resulting integer.NotesBehavior of Argumentless ZQUITWhen specified with no arguments, ZQUIT unwinds the entire stack. Execution continuesat the main program level; that is, the level at which the job began, in either programmermode or application mode.ZQUIT does not change the flow of control. Execution continues with the Caché ObjectScriptcommand that follows ZQUIT. To mimic the errortrap behavior of M/11, an error processingroutine should end with the commandsZQ QUITNote that there are two spaces after ZQ.Here the QUIT command returns to programmer mode if the job began in programmer modeor it exits if the job began in application mode. To log application errors, end your errortrapcode with:ZQ GOTO ^%ETAgain, note the two spaces after ZQ.Behavior of ZQUIT with an ArgumentWhen specified with an argument, ZQUIT does not clear the entire stack, but instead clearsit back one or more levels at which the $ZTRAP special variable was set. The number oflevels is specified by the expression argument, which must evaluate to an integer greater than0. $ZTRAP directs error trapping to the routine to which it is set.756 Caché ObjectScript Reference