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# coding: utf-8 

require 'benchmark'

module IncludeMethod

  ##
  # other instance method include your class
  def include_instance_method_org(instance, method_names)
    self.class.class_eval do
      method_names.each do |method_name|
        define_method(method_name.to_sym) do |*args|
          instance.send(method_name.to_sym, *args)
        end
      end
    end
  end

  def include_instance_method(instance, method_names)
    @instance = instance
    method_names.each do |method_name|
      self.class.class_eval <<-EOS, __FILE__, __LINE__ + 1
        def #{method_name}(*args)
          @instance.send(:#{method_name}, *args)
        end
      EOS
    end
  end

end

class Klass1

  def initialize
  end

  def agree
    puts 'Hello'
  end

  def hinazuki
    puts '馬鹿なの?'
  end

  def byebye(word = 'したっけ！')
    puts word
  end

  def kusoga(type = 0, user = 1)
    if type == 0 && user == 1
      puts 'クソが！'
    elsif type == 1 && user == 2
      puts '君のような感のいいガキは嫌いだよ'
    elsif type == 1
      puts '111111111'
    else
      puts 'にゃーん'
    end
  end

end

class Klass2

  include IncludeMethod

  def initialize
    @klass1 = Klass1.new
    method_names = [:agree, :hinazuki, :byebye, :kusoga]
    include_instance_method(@klass1, method_names)
  end

end

class Klass3

  include IncludeMethod

  def initialize
    @klass1 = Klass1.new
    method_names = [:agree, :hinazuki, :byebye, :kusoga]
    include_instance_method_org(@klass1, method_names)
  end

end

Benchmark.bm do |b|
  b.report 'class_eval string' do
    klass2 = Klass2.new
    p klass2.methods
    klass2.agree
    klass2.byebye
    klass2.byebye('じゃあの')
    klass2.kusoga
    klass2.kusoga(1)
    klass2.kusoga(1, 2)
  end
  b.report 'define_method' do
    klass2 = Klass3.new
    p klass2.methods
    klass2.agree
    klass2.byebye
    klass2.byebye('じゃあの')
    klass2.kusoga
    klass2.kusoga(1)
    klass2.kusoga(1, 2)
  end
end

• output

       user     system      total        real
class_eval string[:klass, :agree, :hinazuki, :byebye, :kusoga, :include_instance_method_org, :include_instance_method, :nil?, :===, :=~, :!~, :eql?, :hash, :<=>, :class, :singleton_class, :clone, :dup, :itself, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :freeze, :frozen?, :to_s, :inspect, :methods, :singleton_methods, :protected_methods, :private_methods, :public_methods, :instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?, :remove_instance_variable, :instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send, :respond_to?, :extend, :display, :method, :public_method, :singleton_method, :define_singleton_method, :object_id, :to_enum, :enum_for, :==, :equal?, :!, :!=, :instance_eval, :instance_exec, :__send__, :__id__]
Hello
したっけ！
じゃあの
クソが！
111111111
君のような感のいいガキは嫌いだよ
  0.000000   0.000000   0.000000 (  0.000298)
define_method[:agree, :hinazuki, :byebye, :kusoga, :include_instance_method_org, :include_instance_method, :nil?, :===, :=~, :!~, :eql?, :hash, :<=>, :class, :singleton_class, :clone, :dup, :itself, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :freeze, :frozen?, :to_s, :inspect, :methods, :singleton_methods, :protected_methods, :private_methods, :public_methods, :instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?, :remove_instance_variable, :instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send, :respond_to?, :extend, :display, :method, :public_method, :singleton_method, :define_singleton_method, :object_id, :to_enum, :enum_for, :==, :equal?, :!, :!=, :instance_eval, :instance_exec, :__send__, :__id__]
Hello
したっけ！
じゃあの
クソが！
111111111
君のような感のいいガキは嫌いだよ
  0.000000   0.000000   0.000000 (  0.001054)