Gemfile

source "https://rubygems.org"

gem 'pry'
gem "scoped_attr_accessor", github: "dbrady/scoped_attr_accessor", branch: "master"

Gemfile.lock

GIT
  remote: git://github.com/dbrady/scoped_attr_accessor.git
  revision: 100d1417ecbbda621e7a23715798f31f16ddb8d2
  branch: master
  specs:
    scoped_attr_accessor (1.0.3)

GEM
  remote: https://rubygems.org/
  specs:
    coderay (1.0.9)
    method_source (0.8.2)
    pry (0.9.12.2)
      coderay (~> 1.0.5)
      method_source (~> 0.8)
      slop (~> 3.4)
    slop (3.4.6)

PLATFORMS
  ruby

DEPENDENCIES
  pry
  scoped_attr_accessor!

method_count.rb

require 'scoped_attr_accessor'
require 'pry'

class With
  extend ScopedAttrAccessor

  attr_reader :foobar
  private_attr_writer :foobar

  def initialize
    @foobar = :from_with_init
  end
end

class Without
  attr_reader :foobar

  def initialize
    @foobar = :from_without_init
  end

  private

  def foobar=(arg); @foobar = arg; end

end

many_methods = With.new
few_methods = Without.new

puts "Using ScopedAttrAccessor: method count = #{many_methods.methods.count}"
puts "Witout ScopedAttrAccessor: method count = #{few_methods.methods.count}"
binding.pry