Experimental Physics and Industrial Control System
|
I could do some tests but it may be faster to ask:
I am looking at section 6.3.4 of the Application Developers Guide.
a) A macro instance can also provide a default value that is used
when no macro with the given name has been defined. The
default value can itself be defined in terms of other macros if
desired, but may not contain any unescaped comma characters.
The syntax for specifying a default value is as follows:
This seems to be clear: default value is used, if macro "name" is
not defined.
b) Finally macro instances can also contain definitions of other
macros, which can (temporarily) override any existing values for
those macros but are in scope only for the duration of the expansion
of this macro instance. These definitions consist of name=value
sequences separated by commas, for example:
$(abcd=$(a)$(b)$(c)$(d),a=A,b=B,c=C,d=D)
Am I correct that is *not* a default value like in a), but that
this expansion always happens and overrides a definition of the
macro "abcd"?
Thanks - rolf -
--
+-------------------------------------------------------+
| Rolf Keitel, Ph.D. Tel: (604) 222-7453 |
| TRIUMF |
| Vancouver, B.C., Canada |
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ANJ, 21 Dec 2017 |
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