function call argument count

[don fisher]

Hello,

Is there a call that can be made from within a function to determine 
how many arguments have been passed to it? I feel such a call would be 
of great assistance when used in conjunction with variable length 
argument lists. In the "old days", VMS pushed a parameter count as 
part of the call frame. You could even determine which variables were 
null, since they always did call by reference and null parameters were 
indicated by a zero address.

Sorry if this is well known, or an invalid request for some reason.
thanks
don
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