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#!N
#!CSeaGreen
#!N #!Rall559 Assignment and Function Call Semantics #!N #!EC #!N #!N
As stated earlier, all assignment statements and function calls initiated at
the top-level environment are executed. In a macro, the process is
slightly different. When a macro is expanded, its statements are first
analyzed to determine whether they need to be executed. The rule
of thumb for determining if a statement will be executed is
that it must contribute, either directly or indirectly, to: #!N #!I0
#!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N o One of the values
passed into a module that has a side effect #!N #!I30
#!N o A value assigned to a top-level variable, using a
macro's formal output parameters. #!N #!I0 #!N #!EF #!N #!N #!N
There are two kinds of "side effect" modules: #!N #!I0 #!N
#!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N o Those that do not produce
any Object outputs. Display and WriteImage are examples of this kind
of module because they modify things such as monitors and files,
which are outside of the language's domain and control. This type
of module is represented in the graphical user interface as having
no output tabs. #!N #!I30 #!N o Those that make use
of internal executive features. These modules are specially marked in their
.mdf (module description) files as ones that can cause side effects.
#!N #!I0 #!N #!EF #!N Side effect modules are always executed.
(For information on the SIDE_EFFECT flag, see #!Lmdfsec,dxall1046 h Module Description Files #!EL in IBM Visualization
Data Explorer Programmer's Reference.) #!N #!N #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next
Topic #!EF #!N #!N #!Lall560,dxall561 h Execution Example #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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