heuristic

	# Heuristic
	fun heuristic_cost(a, b: N): Int is abstract

lib/a_star/a_star.nit:352,2--353,45

	redef fun heuristic_cost(a, b) do return 0

lib/a_star/a_star.nit:372,2--43

	redef fun heuristic_cost(a, b) do return 0

lib/a_star/a_star.nit:401,2--43

	redef fun heuristic_cost(a, b)
	do
		var cost = a.dist_with(b)
		if cost > 100 then return 100
		return cost
	end

lib/a_star/tests/test_a_star.nit:293,2--298,4

abstract fun heuristic_cost(a: N, b: N): Int