Extends $DATA() to reflect the current alias state of the lvn or name argument to identify alias and alias container variables. It treats variables joined through pass-by-reference as well as TP RESTART variables within a transaction as alias variables. However, it does not distinguish nodes having alias containers among their descendants.
In addition to the four standard M results from $DATA(), $ZDATA() returns:
100 for an uninitialized alias or alias container
101 for an alias or alias container with no descendants
111 for an alias or alias container with descendants
Existing $DATA() tests for data and descendants report on alias and alias container variables, as well as other variables in the standard fashion. When an application uses alias and alias container variables $ZDATA() supplies additional information when needed.
Example:
GTM>set a=1,*b(1)=a,*c=d GTM>write $data(a)," ",$zdata(a) 1 101 GTM>write $data(b)," ",$zdata(b) 10 10 GTM>write $data(c)," ",$zdata(c) 0 100 GTM>write $data(d)," ",$zdata(d) 0 100 GTM>write $data(b(1))," ",$zdata(b(1)) 1 101 GTM>set b(1,2)=2 GTM>write $data(b(1))," ",$zdata(b(1)) 11 111 GTM>write $data(b(1,2))," ",$zdata(b(1,2)) 1 1 GTM>