[Bro-Dev] Meta-programming

Seth Hall seth at icir.org
Thu Mar 21 08:54:23 PDT 2013

Let me start by saying that I have an actual use case for this in the measurement framework and I'm not just messing around. :)

function add_x(x: count): function(a: count): count
	local tmp = function(a: count): count
		# The 'x' variable ends up receiving the value of the same arity as my inner
		# defined function instead of the value of the outer scope where 'x' is.
		return a+x;
	return tmp;

event bro_init()
	local my_adder = add_x(5);
	print my_adder(1); # hopefully would print 6, but it prints 2

	local your_adder = add_x(100);
	print your_adder(2); # hopefully would print 102, but it prints 4

Would this functionality working like I wish it did be difficult?  It would make a very nice usability feature for the measurement framework when setting thresholds.


Seth Hall
International Computer Science Institute
(Bro) because everyone has a network

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