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Checking existance passed variables

markbeck over 15 years ago

If I have a procedure:

procedure( foo( @key (x1 nil) )
....
)

And inside it I want to check to see if the key x1 was ever passed in, how would I do that?

I would want the behavior of:

foo()

to be different than

foo(?x1 nil)

So what I need to check is whether x1 was passed in, not whether x1 == nil.

Any ideas?

Mark

markbeck over 15 years ago

A local skill guru helped me out.
To check the existance of a variable being passed in, you just need to specify the variable as 'unbound and use a boundp check internally.
e.g.
procedure( foo( @key (x1 'unbound))
   if(boundp(x1) then
   ....
   ); if
) ; procedure
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Andrew Beckett over 15 years ago

One way is to do:

procedure( foo( @key (x1 'unbound) )
when(boundp('x1)
; it was passed in
...
)
)

Regards,

Andrew
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