# Output
#   p1_a.call(1) => proc1 - a - 1
#   p1_b.call(2) => proc1 - b - 2
#   p2_o.call(3) => proc2 - o - 3
#   p2_p.call(4) => proc2 - p - 4
#   TestClass.m_block(&p1_a) => method TestClass.m_block yield(100) => proc1 - a - 100
#   TestClass.m_block(&p1_b) => method TestClass.m_block yield(101) => proc1 - b - 101
#   TestClass.m_block(&p2_o) => method TestClass.m_block yield(102) => proc2 - o - 102
#   TestClass.m_block(&p2_p) => method TestClass.m_block yield(103) => proc2 - p - 103

class TestClass
  @@counter = 99
  class << self
    def count
      @@counter += 1
      @@counter
    end
    def proc1(create_name)
      method_name = 'proc1'
      Proc.new { |arg|
        "#{method_name} - #{create_name} - #{arg}"
      }
    end
    def proc2(create_name)
      method_name = 'proc2'
      Proc.new { |arg|
        "#{method_name} - #{create_name} - #{arg}"
      }
    end
    def m_block
      n = TestClass.count
      "method TestClass.m_block yield(#{n}) => #{yield n}"
    end
  end
end

p1_a = TestClass.proc1 "a"
p1_b = TestClass.proc1 "b"
p2_o = TestClass.proc2 "o"
p2_p = TestClass.proc2 "p"

puts "p1_a.call(1) => #{p1_a.call(1)}"
puts "p1_b.call(2) => #{p1_b.call(2)}"
puts "p2_o.call(3) => #{p2_o.call(3)}"
puts "p2_p.call(4) => #{p2_p.call(4)}"

puts "TestClass.m_block(&p1_a) => #{TestClass.m_block(&p1_a)}"
puts "TestClass.m_block(&p1_b) => #{TestClass.m_block(&p1_b)}"
puts "TestClass.m_block(&p2_o) => #{TestClass.m_block(&p2_o)}"
puts "TestClass.m_block(&p2_p) => #{TestClass.m_block(&p2_p)}"