++IFMAP <variable>
...
{++ELIFMAP <label>
...}
++ENDIF
or
++IFNMAP <variable>
...
{++ELIFMAP <variable>
...}
++ENDIF
These conditionals may be used to conditionally compile sections of code based on whether a specified variable has been mapped. For example:
++IFMAP WORK'VARS
<work statements>
++ELIFMAP PLAY'VARS
<play statements>
++ELSE
MAP1 WORK'VARS
MAP2 JOB$,S,10
MAP1 PLAY'VARS
MAP2 GAME$,S,10
++ENDIF
Note that even when used within a ++INCLUDE file, or a procedure/function, the variable name evaluated by the conditional is treated as global, and thus will not work as expected if the variable you are referring to was defined privately or locally. For example, both of the following conditions will act based on whether the specified variable has been previously mapped globally, even though you may be expecting otherwise:
++IFNMAP Module_Private_Var
PRIVATE MAP1 Module_Private_Var,B,1
++ENDIF
Procedure Test()
++IFNMAP FLAG
MAP1 FLAG,B,1
++ENDIF
...
EndProcedure
This is because private variables (and local variables) are defined in separate areas relative to their scope, but the conditional statements have no good way of knowing which context you are referring to, and checking multiple contexts would introduce another layer of confusion, so they always refer to the global context.
