Re: Prototyping procedure pointers

[Jon_Paris@xxxxxx]

 >>  Perhaps I'm having a low biorythm day but I can't see why the
apostrophes matter.

'biorythm' - ah now that takes me back .......

When you code without the aposts you are simply telling the compiler to use
the address found in the named procedure pointer as the target for the
call.

This is easier to show through code than words so ....

     D CallByPtr       Pr                  ExtProc(pMyProc)

     D pMyProc         S               *   ProcPtr Inz(%PAddr('MyProc'))


This first prototype and proc pointer is equivalent to this:

     D CallByName      Pr                  ExtProc('MyProc')

The difference being of cource that if you change the content of pMyProc
you change the target of the call - which is impossible with the
conventional CallByName approach.
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