Added February 2022
.ISDEF(ds.member)
.ISDEF(ds.@member$)
.ISDEF() returns true (-1) or false (0) depending on whether the specified DYNSTRUCT member (ds.member or ds.@member) exists—i.e., whether the DYNSTRUCT is bound to a structure that contains the specified member.
Example
map1 ds,DYNSTRUCT
map1 field$,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 Also
| • | MX_DYNSTRUCT (DYNOP_INFO) for an alternate approach to determining the details of the current binding for a specified DYNSTRUCT. |
History
2022 February, A-Shell 6.5.1711: Function added to A-Shell
