Language enhancement: The new dot function .ISDEF() can be used to determine whether the specified DYNSTRUCT member exists, i.e. whether the DYNSTRUCT is bound to a structure that contains the specified member. Syntax:
.ISDEF(ds.member) ! (Simple Indirect)
.ISDEF(ds.@member$) ! (Indirect Deferred)
Example:
map1 ds,DYNSTRUCT
map1 field$,s,30
...
if .ISDEF(ds.foo) then
? "ds.foo exists; value = ";ds.foo
endif
... field$ = "foo"
if .ISDEF(ds.@field$) then
? "ds.@";field$;" exists; value = ";ds.@field$
endif
See MX_DYNSTRUCT (DYNOP_INFO) for an alternate approach to determining the details of the current finding for a specified DYNSTRUCT.
