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require 'benchmark/ips'

# You may ask: 'Is there a project that still using `ancestors.include?`?'

# By quick searching, I found the following popular repositories are still using it:

# - rake

# - https://github.com/ruby/rake/blob/7d0c08fe4e97083a92d2c8fc740cb421fd062117/lib/rake/task_manager.rb#L28

# - warden

# - https://github.com/hassox/warden/blob/090ed153dbd2f5bf4a1ca672b3018877e21223a4/lib/warden/strategies.rb#L16

# - metasploit-framework

# - https://github.com/rapid7/metasploit-framework/blob/cac890a797d0d770260074dfe703eb5cfb63bd46/lib/msf/core/payload_set.rb#L239

# - https://github.com/rapid7/metasploit-framework/blob/cb82015c8782280d964e222615b54c881bd36bbe/lib/msf/core/exploit.rb#L1440

# - hanami

# - https://github.com/hanami/hanami/blob/506a35e5262939eb4dce9195ade3268e19928d00/lib/hanami/components/routes_inspector.rb#L54

# - https://github.com/hanami/hanami/blob/aec069b602c772e279aa0a7f48d1a04d01756ee3/lib/hanami/configuration.rb#L114

# Sanity check that both ways give the same answer, so the reports compare equal work.

raise unless Object.ancestors.include?(Kernel)

raise unless (Object <= Kernel)

def fast

(Class <= Class)

(Class <= Module)

(Class <= Object)

(Class <= Kernel)

(Class <= BasicObject)

end

def slow

Class.ancestors.include?(Class)

Class.ancestors.include?(Module)

Class.ancestors.include?(Object)

Class.ancestors.include?(Kernel)

Class.ancestors.include?(BasicObject)

end

Benchmark.ips do |x|

x.report('less than or equal') { fast }

x.report('ancestors.include?') { slow }

x.compare!

end