John McKown asked:
>I likely want something that is really impossible. I would like to write a
macro which does not specify any parameters, but can dynamically detect
them in the macro itself. For positional parameters, this could likely be
easy via &SYSLIST.
Not at all impossible! Try something like this, where you can pre-process
and post-process a library macro. You must define your macro inline, not
in the same SYSLIB sequence as the macro you want to front-end.
Macro , Defined in the source program
&L READ &A,&B,&C
READ_XX OpSyn READ Save Wrapper's definition as READ_XX
READ OpSyn , Nullify this macro's definition
- - - ...perform 'front-end' processing
&L READ &A1,&B1,&C1 Call system version of READ
- - - ...perform 'back-end' processing
READ OpSyn READ_XX Re-establish Wrapper's definition
MEnd
This is one of several unusual macro techinques described in my SHARE
presentation; see the proceedings of the Anaheim SHARE conference in August
2012, Sessions 11194-5. (The title of the session calls the HLASM macro
language "A++" because it's the most advanced macro facility in any
programming language I know of.)
John Ehrman.
