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Tensho/count_ruby_instances_by_class_1.rb

Created August 27, 2018 20:15
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count_ruby_instances_by_class_1.rb
class A
def self.count
@count
end
def self.count=(v)
@count = v
end
def initialize
self.class.count += 1
end
end
class B < A
@count = 0
end
class C < A
@count = 0
end
B.new
C.new
C.new
B.count #=> 1
C.count #=> 2
Raw
count_ruby_instances_by_class_2.rb
A = Class.new
B = Class.new(A)
C = Class.new(A)
B.new
C.new
C.new
ObjectSpace.each_object(B).count #=> 1
ObjectSpace.each_object(C).count #=> 2
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