Allow statement in pool
Simon Hobson
dhcp1 at thehobsons.co.uk
Fri Mar 2 08:10:37 UTC 2007
Lars Jacobsen wrote:
> > class_xy { match if ( X and Y ) }
>I noticed that you use both () and {} in one of the examples. Is there
>any difference to the server or is it just for making it easy for us
>humans to distinguish between the logic ?
No, it is required syntax.
Typically, definitions use braces, eg :
subnet .... {
....
}
Parentheses are used for grouping in arithmetic or logical constructs, eg :
( 1+2 ) * 3
So in the definition above, the braces are syntax for the class
definition, the parenthesis are for logical grouping - though I think
in the simple example would be redundant. Consider this more
complicated example :
class_xy { match if ( ( X1 or X2 or X3 ) and ( Y1 or Y2 ) ) }
Without the grouping it would mean X1 or X2 or (X3 and Y1) or Y2
which is a totally different meaning.
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