override_visibility_methods.rb

class Neko
  %w(public protected private).each do |method_name|
    original_method = method(method_name)

    define_singleton_method(method_name) do |*args, &block|
      puts "Called: #{method_name}"
      original_method[*args, &block]
    end
  end

  def public_method; end

  private

  def private_method; end

  protected

  def protected_method; end
end

puts Neko.new.public_methods.include?(:public_method)
puts Neko.new.protected_methods.include?(:protected_method)
puts Neko.new.private_methods.include?(:private_method)